Merge branch '2020-10-14-assorted-changes'

- Add support for Linux "pstore" dumps.
- Button command fixup.
- gd cleanup and documentation.
- Assorted other cleanups.

arch/arm/Kconfig

@@ -938,6 +938,7 @@ config ARCH_QEMU
 	select OF_CONTROL
 	select PL01X_SERIAL
 	imply CMD_DM
+	imply DM_RNG
 	imply DM_RTC
 	imply RTC_PL031
 

arch/sandbox/dts/sandbox.dtsi

@@ -18,14 +18,14 @@
 	buttons {
 		compatible = "gpio-keys";
 
-		summer {
+		btn1 {
 			gpios = <&gpio_a 3 0>;
-			label = "summer";
+			label = "button1";
 		};
 
-		christmas {
+		btn2 {
 			gpios = <&gpio_a 4 0>;
-			label = "christmas";
+			label = "button2";
 		};
 	};
 

arch/sandbox/dts/test.dts

@@ -55,14 +55,14 @@
 	buttons {
 		compatible = "gpio-keys";
 
-		summer {
+		btn1 {
 			gpios = <&gpio_a 3 0>;
-			label = "summer";
+			label = "button1";
 		};
 
-		christmas {
+		btn2 {
 			gpios = <&gpio_a 4 0>;
-			label = "christmas";
+			label = "button2";
 		};
 	};
 

cmd/Kconfig

@@ -1751,6 +1751,77 @@ config CMD_QFW
 	  feature is to allow easy loading of files passed to qemu-system
 	  via -kernel / -initrd
 
+config CMD_PSTORE
+	bool "pstore"
+	help
+	  This provides access to Linux PStore with Rammoops backend. The main
+	  feature is to allow to display or save PStore records.
+
+	  See doc/pstore.rst for more information.
+
+if CMD_PSTORE
+
+config CMD_PSTORE_MEM_ADDR
+	hex "Memory Address"
+	depends on CMD_PSTORE
+	help
+	  Base addr used for PStore ramoops memory, should be identical to
+	  ramoops.mem_address parameter used by kernel
+
+config CMD_PSTORE_MEM_SIZE
+	hex "Memory size"
+	depends on CMD_PSTORE
+	default "0x10000"
+	help
+	  Size of PStore ramoops memory, should be identical to ramoops.mem_size
+	  parameter used by kernel, a power of 2 and larger than the sum of the
+	  record sizes
+
+config CMD_PSTORE_RECORD_SIZE
+	hex "Dump record size"
+	depends on CMD_PSTORE
+	default "0x1000"
+	help
+	  Size of each dump done on oops/panic, should be identical to
+	  ramoops.record_size parameter used by kernel and a power of 2
+	  Must be non-zero
+
+config CMD_PSTORE_CONSOLE_SIZE
+	hex "Kernel console log size"
+	depends on CMD_PSTORE
+	default "0x1000"
+	help
+	  Size of kernel console log, should be identical to
+	  ramoops.console_size parameter used by kernel and a power of 2
+	  Must be non-zero
+
+config CMD_PSTORE_FTRACE_SIZE
+	hex "FTrace log size"
+	depends on CMD_PSTORE
+	default "0x1000"
+	help
+	  Size of ftrace log, should be identical to ramoops.ftrace_size
+	  parameter used by kernel and a power of 2
+
+config CMD_PSTORE_PMSG_SIZE
+	hex "User space message log size"
+	depends on CMD_PSTORE
+	default "0x1000"
+	help
+	  Size of user space message log, should be identical to
+	  ramoops.pmsg_size parameter used by kernel and a power of 2
+
+config CMD_PSTORE_ECC_SIZE
+	int "ECC size"
+	depends on CMD_PSTORE
+	default "0"
+	help
+	if non-zero, the option enables ECC support and specifies ECC buffer
+	size in bytes (1 is a special value, means 16 bytes ECC), should be
+	identical to ramoops.ramoops_ecc parameter used by kernel
+
+endif
+
 source "cmd/mvebu/Kconfig"
 
 config CMD_TERMINAL

cmd/Makefile

@@ -116,6 +116,7 @@ obj-$(CONFIG_CMD_PCI) += pci.o
 endif
 obj-$(CONFIG_CMD_PINMUX) += pinmux.o
 obj-$(CONFIG_CMD_PMC) += pmc.o
+obj-$(CONFIG_CMD_PSTORE) += pstore.o
 obj-$(CONFIG_CMD_PXE) += pxe.o pxe_utils.o
 obj-$(CONFIG_CMD_WOL) += wol.o
 obj-$(CONFIG_CMD_QFW) += qfw.o

cmd/button.c

@@ -75,11 +75,11 @@ int do_button(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 
 	ret = show_button_state(dev);
 
-	return 0;
+	return !ret;
 }
 
 U_BOOT_CMD(
-	button, 4, 1, do_button,
+	button, 2, 1, do_button,
 	"manage buttons",
 	"<button_label> \tGet button state\n"
 	"button list\t\tShow a list of buttons"

cmd/pstore.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright © 2019 Collabora Ltd
+ */
+
+#include <config.h>
+#include <command.h>
+#include <fs.h>
+#include <log.h>
+#include <mapmem.h>
+#include <memalign.h>
+#include <part.h>
+
+struct persistent_ram_buffer {
+	u32    sig;
+	u32    start;
+	u32    size;
+	u8     data[0];
+};
+
+#define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */
+#define RAMOOPS_KERNMSG_HDR "===="
+
+#define PSTORE_TYPE_DMESG 0
+#define PSTORE_TYPE_CONSOLE 2
+#define PSTORE_TYPE_FTRACE 3
+#define PSTORE_TYPE_PMSG 7
+#define PSTORE_TYPE_ALL 255
+
+static phys_addr_t pstore_addr = CONFIG_CMD_PSTORE_MEM_ADDR;
+static phys_size_t pstore_length = CONFIG_CMD_PSTORE_MEM_SIZE;
+static unsigned int pstore_record_size = CONFIG_CMD_PSTORE_RECORD_SIZE;
+static unsigned int pstore_console_size = CONFIG_CMD_PSTORE_CONSOLE_SIZE;
+static unsigned int pstore_ftrace_size = CONFIG_CMD_PSTORE_FTRACE_SIZE;
+static unsigned int pstore_pmsg_size = CONFIG_CMD_PSTORE_PMSG_SIZE;
+static unsigned int pstore_ecc_size = CONFIG_CMD_PSTORE_ECC_SIZE;
+static unsigned int buffer_size;
+
+ /**
+  * pstore_read_kmsg_hdr() - Check kernel header and get compression flag if
+  *                          available.
+  * @buffer: Kernel messages buffer.
+  * @compressed: Returns TRUE if kernel buffer is compressed, else FALSE.
+  *
+  * Check if buffer starts with a kernel header of the form:
+  *   ====<secs>.<nsecs>[-<compression>]\n
+  * If <compression> is equal to 'C' then the buffer is compressed, else iter
+  * should be 'D'.
+  *
+  * Return: Length of kernel header.
+  */
+static int pstore_read_kmsg_hdr(char *buffer, bool *compressed)
+{
+	char *ptr = buffer;
+	*compressed = false;
+
+	if (strncmp(RAMOOPS_KERNMSG_HDR, ptr, strlen(RAMOOPS_KERNMSG_HDR)) != 0)
+		return 0;
+
+	ptr += strlen(RAMOOPS_KERNMSG_HDR);
+
+	ptr = strchr(ptr, '\n');
+	if (!ptr)
+		return 0;
+
+	if (ptr[-2] == '-' && ptr[-1] == 'C')
+		*compressed = true;
+
+	return ptr - buffer + 1;
+}
+
+/**
+ * pstore_get_buffer() - Get unwrapped record buffer
+ * @sig: Signature to check
+ * @buffer: Buffer containing wrapped record
+ * @size: wrapped record size
+ * @dest: Buffer used to store unwrapped record
+ *
+ * The record starts with <signature><start><size> header.
+ * The signature is 'DBGC' for all records except for Ftrace's record(s) wich
+ * use LINUX_VERSION_CODE ^ 'DBGC'.
+ * Use 0 for @sig to prevent checking signature.
+ * Start and size are 4 bytes long.
+ *
+ * Return: record's length
+ */
+static u32 pstore_get_buffer(u32 sig, phys_addr_t buffer, u32 size, char *dest)
+{
+	struct persistent_ram_buffer *prb =
+		(struct persistent_ram_buffer *)map_sysmem(buffer, size);
+	u32 dest_size;
+
+	if (sig == 0 || prb->sig == sig) {
+		if (prb->size == 0) {
+			log_debug("found existing empty buffer\n");
+			return 0;
+		}
+
+		if (prb->size > size) {
+			log_debug("found existing invalid buffer, size %u, start %u\n",
+			          prb->size, prb->start);
+			return 0;
+		}
+	} else {
+		log_debug("no valid data in buffer (sig = 0x%08x)\n", prb->sig);
+		return 0;
+	}
+
+	log_debug("found existing buffer, size %u, start %u\n",
+	          prb->size, prb->start);
+
+	memcpy(dest, &prb->data[prb->start], prb->size - prb->start);
+	memcpy(dest + prb->size - prb->start, &prb->data[0], prb->start);
+
+	dest_size = prb->size;
+	unmap_sysmem(prb);
+
+	return dest_size;
+}
+
+/**
+ * pstore_init_buffer_size() - Init buffer size to largest record size
+ *
+ * Records, console, FTrace and user logs can use different buffer sizes.
+ * This function allows to retrieve the biggest one.
+ */
+static void pstore_init_buffer_size(void)
+{
+	if (pstore_record_size > buffer_size)
+		buffer_size = pstore_record_size;
+
+	if (pstore_console_size > buffer_size)
+		buffer_size = pstore_console_size;
+
+	if (pstore_ftrace_size > buffer_size)
+		buffer_size = pstore_ftrace_size;
+
+	if (pstore_pmsg_size > buffer_size)
+		buffer_size = pstore_pmsg_size;
+}
+
+/**
+ * pstore_set() - Initialize PStore settings from command line arguments
+ * @cmdtp: Command data struct pointer
+ * @flag: Command flag
+ * @argc: Command-line argument count
+ * @argv: Array of command-line arguments
+ *
+ * Set pstore reserved memory info, starting at 'addr' for 'len' bytes.
+ * Default length for records is 4K.
+ * Mandatory arguments:
+ * - addr: ramoops starting address
+ * - len: ramoops total length
+ * Optional arguments:
+ * - record-size: size of one panic or oops record ('dump' type)
+ * - console-size: size of the kernel logs record
+ * - ftrace-size: size of the ftrace record(s), this can be a single record or
+ *                divided in parts based on number of CPUs
+ * - pmsg-size: size of the user space logs record
+ * - ecc-size: enables/disables ECC support and specifies ECC buffer size in
+ *             bytes (0 disables it, 1 is a special value, means 16 bytes ECC)
+ *
+ * Return: zero on success, CMD_RET_USAGE in case of misuse and negative
+ * on error.
+ */
+static int pstore_set(struct cmd_tbl *cmdtp, int flag,  int argc,
+		      char * const argv[])
+{
+	if (argc < 3)
+		return CMD_RET_USAGE;
+
+	/* Address is specified since argc > 2
+	 */
+	pstore_addr = simple_strtoul(argv[1], NULL, 16);
+
+	/* Length is specified since argc > 2
+	 */
+	pstore_length = simple_strtoul(argv[2], NULL, 16);
+
+	if (argc > 3)
+		pstore_record_size = simple_strtoul(argv[3], NULL, 16);
+
+	if (argc > 4)
+		pstore_console_size = simple_strtoul(argv[4], NULL, 16);
+
+	if (argc > 5)
+		pstore_ftrace_size = simple_strtoul(argv[5], NULL, 16);
+
+	if (argc > 6)
+		pstore_pmsg_size = simple_strtoul(argv[6], NULL, 16);
+
+	if (argc > 7)
+		pstore_ecc_size = simple_strtoul(argv[7], NULL, 16);
+
+	if (pstore_length < (pstore_record_size + pstore_console_size
+			     + pstore_ftrace_size + pstore_pmsg_size)) {
+		printf("pstore <len> should be larger than the sum of all records sizes\n");
+		pstore_length = 0;
+	}
+
+	log_debug("pstore set done: start 0x%08llx - length 0x%llx\n",
+	          (unsigned long long)pstore_addr,
+	          (unsigned long long)pstore_length);
+
+	return 0;
+}
+
+/**
+ * pstore_print_buffer() - Print buffer
+ * @type: buffer type
+ * @buffer: buffer to print
+ * @size: buffer size
+ *
+ * Print buffer type and content
+ */
+static void pstore_print_buffer(char *type, char *buffer, u32 size)
+{
+	u32 i = 0;
+
+	printf("**** %s\n", type);
+	while (i < size && buffer[i] != 0) {
+		putc(buffer[i]);
+		i++;
+	}
+}
+
+/**
+ * pstore_display() - Display existing records in pstore reserved memory
+ * @cmdtp: Command data struct pointer
+ * @flag: Command flag
+ * @argc: Command-line argument count
+ * @argv: Array of command-line arguments
+ *
+ * A 'record-type' can be given to only display records of this kind.
+ * If no 'record-type' is given, all valid records are dispayed.
+ * 'record-type' can be one of 'dump', 'console', 'ftrace' or 'user'. For 'dump'
+ * and 'ftrace' types, a 'nb' can be given to only display one record.
+ *
+ * Return: zero on success, CMD_RET_USAGE in case of misuse and negative
+ * on error.
+ */
+static int pstore_display(struct cmd_tbl *cmdtp, int flag,  int argc,
+			  char * const argv[])
+{
+	int type = PSTORE_TYPE_ALL;
+	phys_addr_t ptr;
+	char *buffer;
+	u32 size;
+	int header_len = 0;
+	bool compressed;
+
+	if (argc > 1) {
+		if (!strcmp(argv[1], "dump"))
+			type = PSTORE_TYPE_DMESG;
+		else if (!strcmp(argv[1], "console"))
+			type = PSTORE_TYPE_CONSOLE;
+		else if (!strcmp(argv[1], "ftrace"))
+			type = PSTORE_TYPE_FTRACE;
+		else if (!strcmp(argv[1], "user"))
+			type = PSTORE_TYPE_PMSG;
+		else
+			return CMD_RET_USAGE;
+	}
+
+	if (pstore_length == 0) {
+		printf("Please set PStore configuration\n");
+		return CMD_RET_USAGE;
+	}
+
+	if (buffer_size == 0)
+		pstore_init_buffer_size();
+
+	buffer = malloc_cache_aligned(buffer_size);
+
+	if (type == PSTORE_TYPE_DMESG || type == PSTORE_TYPE_ALL) {
+		ptr = pstore_addr;
+		phys_addr_t ptr_end = ptr + pstore_length - pstore_pmsg_size
+				- pstore_ftrace_size - pstore_console_size;
+
+		if (argc > 2) {
+			ptr += simple_strtoul(argv[2], NULL, 10)
+				* pstore_record_size;
+			ptr_end = ptr + pstore_record_size;
+		}
+
+		while (ptr < ptr_end) {
+			size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr,
+						 pstore_record_size, buffer);
+			ptr += pstore_record_size;
+
+			if (size == 0)
+				continue;
+
+			header_len = pstore_read_kmsg_hdr(buffer, &compressed);
+			if (header_len == 0) {
+				log_debug("no valid kernel header\n");
+				continue;
+			}
+
+			if (compressed) {
+				printf("Compressed buffer, display not available\n");
+				continue;
+			}
+
+			pstore_print_buffer("Dump", buffer + header_len,
+					    size - header_len);
+		}
+	}
+
+	if (type == PSTORE_TYPE_CONSOLE || type == PSTORE_TYPE_ALL) {
+		ptr = pstore_addr + pstore_length - pstore_pmsg_size
+			- pstore_ftrace_size - pstore_console_size;
+		size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr,
+					 pstore_console_size, buffer);
+		if (size != 0)
+			pstore_print_buffer("Console", buffer, size);
+	}
+
+	if (type == PSTORE_TYPE_FTRACE || type == PSTORE_TYPE_ALL) {
+		ptr = pstore_addr + pstore_length - pstore_pmsg_size
+		- pstore_ftrace_size;
+		/* The FTrace record(s) uses LINUX_VERSION_CODE ^ 'DBGC'
+		 * signature, pass 0 to pstore_get_buffer to prevent
+		 * checking it
+		 */
+		size = pstore_get_buffer(0, ptr, pstore_ftrace_size, buffer);
+		if (size != 0)
+			pstore_print_buffer("FTrace", buffer, size);
+	}
+
+	if (type == PSTORE_TYPE_PMSG || type == PSTORE_TYPE_ALL) {
+		ptr = pstore_addr + pstore_length - pstore_pmsg_size;
+		size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr,
+					 pstore_pmsg_size, buffer);
+		if (size != 0)
+			pstore_print_buffer("User", buffer, size);
+	}
+
+	free(buffer);
+
+	return 0;
+}
+
+/**
+ * pstore_save() - Save existing records from pstore reserved memory
+ * @cmdtp: Command data struct pointer
+ * @flag: Command flag
+ * @argc: Command-line argument count
+ * @argv: Array of command-line arguments
+ *
+ * the records are saved under 'directory path', which should already exist,
+ * to partition 'part' on device type 'interface' instance 'dev'
+ * Filenames are automatically generated, depending on record type, like in
+ * /sys/fs/pstore under Linux
+ *
+ * Return: zero on success, CMD_RET_USAGE in case of misuse and negative
+ * on error.
+ */
+static int pstore_save(struct cmd_tbl *cmdtp, int flag,  int argc,
+		       char * const argv[])
+{
+	phys_addr_t ptr, ptr_end;
+	char *buffer;
+	char *save_argv[6];
+	char addr[19], length[19];
+	char path[256];
+	u32 size;
+	unsigned int index;
+	int header_len = 0;
+	bool compressed;
+
+	if (argc < 4)
+		return CMD_RET_USAGE;
+
+	if (pstore_length == 0) {
+		printf("Please set PStore configuration\n");
+		return CMD_RET_USAGE;
+	}
+
+	if (buffer_size == 0)
+		pstore_init_buffer_size();
+
+	buffer = malloc_cache_aligned(buffer_size);
+	sprintf(addr, "0x%p", buffer);
+
+	save_argv[0] = argv[0];
+	save_argv[1] = argv[1];
+	save_argv[2] = argv[2];
+	save_argv[3] = addr;
+	save_argv[4] = path;
+	save_argv[5] = length;
+
+	/* Save all Dump records */
+	ptr = pstore_addr;
+	ptr_end = ptr + pstore_length - pstore_pmsg_size - pstore_ftrace_size
+				- pstore_console_size;
+	index = 0;
+	while (ptr < ptr_end) {
+		size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr,
+					 pstore_record_size, buffer);
+		ptr += pstore_record_size;
+
+		if (size == 0)
+			continue;
+
+		header_len = pstore_read_kmsg_hdr(buffer, &compressed);
+		if (header_len == 0) {
+			log_debug("no valid kernel header\n");
+			continue;
+		}
+
+		sprintf(addr, "0x%08lx", (ulong)map_to_sysmem(buffer + header_len));
+		sprintf(length, "0x%X", size - header_len);
+		sprintf(path, "%s/dmesg-ramoops-%u%s", argv[3], index,
+			compressed ? ".enc.z" : "");
+		do_save(cmdtp, flag, 6, save_argv, FS_TYPE_ANY);
+		index++;
+	}
+
+	sprintf(addr, "0x%08lx", (ulong)map_to_sysmem(buffer));
+
+	/* Save Console record */
+	size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr, pstore_console_size,
+				 buffer);
+	if (size != 0) {
+		sprintf(length, "0x%X", size);
+		sprintf(path, "%s/console-ramoops-0", argv[3]);
+		do_save(cmdtp, flag, 6, save_argv, FS_TYPE_ANY);
+	}
+	ptr += pstore_console_size;
+
+	/* Save FTrace record(s)
+	 * The FTrace record(s) uses LINUX_VERSION_CODE ^ 'DBGC' signature,
+	 * pass 0 to pstore_get_buffer to prevent checking it
+	 */
+	size = pstore_get_buffer(0, ptr, pstore_ftrace_size, buffer);
+	if (size != 0) {
+		sprintf(length, "0x%X", size);
+		sprintf(path, "%s/ftrace-ramoops-0", argv[3]);
+		do_save(cmdtp, flag, 6, save_argv, FS_TYPE_ANY);
+	}
+	ptr += pstore_ftrace_size;
+
+	/* Save Console record */
+	size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr, pstore_pmsg_size,
+				 buffer);
+	if (size != 0) {
+		sprintf(length, "0x%X", size);
+		sprintf(path, "%s/pmsg-ramoops-0", argv[3]);
+		do_save(cmdtp, flag, 6, save_argv, FS_TYPE_ANY);
+	}
+
+	free(buffer);
+
+	return 0;
+}
+
+static struct cmd_tbl cmd_pstore_sub[] = {
+	U_BOOT_CMD_MKENT(set, 8, 0, pstore_set, "", ""),
+	U_BOOT_CMD_MKENT(display, 3, 0, pstore_display, "", ""),
+	U_BOOT_CMD_MKENT(save, 4, 0, pstore_save, "", ""),
+};
+
+static int do_pstore(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct cmd_tbl *c;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	/* Strip off leading argument */
+	argc--;
+	argv++;
+
+	c = find_cmd_tbl(argv[0], cmd_pstore_sub, ARRAY_SIZE(cmd_pstore_sub));
+
+	if (!c)
+		return CMD_RET_USAGE;
+
+	return c->cmd(cmdtp, flag, argc, argv);
+}
+
+void fdt_fixup_pstore(void *blob)
+{
+	char node[32];
+	int  nodeoffset;	/* node offset from libfdt */
+
+	nodeoffset = fdt_path_offset(blob, "/");
+	if (nodeoffset < 0) {
+		/* Not found or something else bad happened. */
+		log_err("fdt_path_offset() returned %s\n", fdt_strerror(nodeoffset));
+		return;
+	}
+
+	nodeoffset = fdt_add_subnode(blob, nodeoffset, "reserved-memory");
+	if (nodeoffset < 0) {
+		log_err("Add 'reserved-memory' node failed: %s\n",
+				fdt_strerror(nodeoffset));
+		return;
+	}
+	fdt_setprop_u32(blob, nodeoffset, "#address-cells", 2);
+	fdt_setprop_u32(blob, nodeoffset, "#size-cells", 2);
+	fdt_setprop_empty(blob, nodeoffset, "ranges");
+
+	sprintf(node, "ramoops@%llx", (unsigned long long)pstore_addr);
+	nodeoffset = fdt_add_subnode(blob, nodeoffset, node);
+	if (nodeoffset < 0) {
+		log_err("Add '%s' node failed: %s\n", node, fdt_strerror(nodeoffset));
+		return;
+	}
+	fdt_setprop_string(blob, nodeoffset, "compatible", "ramoops");
+	fdt_setprop_u64(blob, nodeoffset, "reg", pstore_addr);
+	fdt_appendprop_u64(blob, nodeoffset, "reg", pstore_length);
+	fdt_setprop_u32(blob, nodeoffset, "record-size", pstore_record_size);
+	fdt_setprop_u32(blob, nodeoffset, "console-size", pstore_console_size);
+	fdt_setprop_u32(blob, nodeoffset, "ftrace-size", pstore_ftrace_size);
+	fdt_setprop_u32(blob, nodeoffset, "pmsg-size", pstore_pmsg_size);
+	fdt_setprop_u32(blob, nodeoffset, "ecc-size", pstore_ecc_size);
+}
+
+U_BOOT_CMD(pstore, 10, 0, do_pstore,
+	   "Manage Linux Persistent Storage",
+	   "set <addr> <len> [record-size] [console-size] [ftrace-size] [pmsg_size] [ecc-size]\n"
+	   "- Set pstore reserved memory info, starting at 'addr' for 'len' bytes.\n"
+	   "  Default length for records is 4K.\n"
+	   "  'record-size' is the size of one panic or oops record ('dump' type).\n"
+	   "  'console-size' is the size of the kernel logs record.\n"
+	   "  'ftrace-size' is the size of the ftrace record(s), this can be a single\n"
+	   "  record or divided in parts based on number of CPUs.\n"
+	   "  'pmsg-size' is the size of the user space logs record.\n"
+	   "  'ecc-size' enables/disables ECC support and specifies ECC buffer size in\n"
+	   "  bytes (0 disables it, 1 is a special value, means 16 bytes ECC).\n"
+	   "pstore display [record-type] [nb]\n"
+	   "- Display existing records in pstore reserved memory. A 'record-type' can\n"
+	   "  be given to only display records of this kind. 'record-type' can be one\n"
+	   "  of 'dump', 'console', 'ftrace' or 'user'. For 'dump' and 'ftrace' types,\n"
+	   "  a 'nb' can be given to only display one record.\n"
+	   "pstore save <interface> <dev[:part]> <directory-path>\n"
+	   "- Save existing records in pstore reserved memory under 'directory path'\n"
+	   "  to partition 'part' on device type 'interface' instance 'dev'.\n"
+	   "  Filenames are automatically generated, depending on record type, like\n"
+	   "  in /sys/fs/pstore under Linux.\n"
+	   "  The 'directory-path' should already exist.\n"
+);

common/image-fdt.c

@@ -567,6 +567,10 @@ int image_setup_libfdt(bootm_headers_t *images, void *blob,
 
 	/* Update ethernet nodes */
 	fdt_fixup_ethernet(blob);
+#if CONFIG_IS_ENABLED(CMD_PSTORE)
+	/* Append PStore configuration */
+	fdt_fixup_pstore(blob);
+#endif
 	if (IMAGE_OF_BOARD_SETUP) {
 		fdt_ret = ft_board_setup(blob, gd->bd);
 		if (fdt_ret) {

common/spl/Kconfig

@@ -1237,6 +1237,7 @@ endchoice
 
 config SPL_USB_SDP_SUPPORT
 	bool "Support SDP (Serial Download Protocol)"
+	depends on SPL_SERIAL_SUPPORT
 	help
 	  Enable Serial Download Protocol (SDP) device support in SPL. This
 	  allows to download images into memory and execute (jump to) them

common/spl/spl.c

@@ -552,7 +552,9 @@ static int boot_from_devices(struct spl_image_info *spl_image,
 		struct spl_image_loader *loader;
 
 		loader = spl_ll_find_loader(spl_boot_list[i]);
-#if defined(CONFIG_SPL_SERIAL_SUPPORT) && defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
+#if defined(CONFIG_SPL_SERIAL_SUPPORT) \
+    && defined(CONFIG_SPL_LIBCOMMON_SUPPORT)    \
+    && !defined(CONFIG_SILENT_CONSOLE)
 		if (loader)
 			printf("Trying to boot from %s\n", loader->name);
 		else

configs/sandbox64_defconfig

@@ -80,6 +80,8 @@ CONFIG_CMD_CBFS=y
 CONFIG_CMD_CRAMFS=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_MTDPARTS=y
+CONFIG_CMD_PSTORE=y
+CONFIG_CMD_PSTORE_MEM_ADDR=0x3000000
 CONFIG_MAC_PARTITION=y
 CONFIG_AMIGA_PARTITION=y
 CONFIG_OF_CONTROL=y

configs/sandbox_defconfig

@@ -93,6 +93,8 @@ CONFIG_CMD_CRAMFS=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_SQUASHFS=y
 CONFIG_CMD_MTDPARTS=y
+CONFIG_CMD_PSTORE=y
+CONFIG_CMD_PSTORE_MEM_ADDR=0x3000000
 CONFIG_MAC_PARTITION=y
 CONFIG_AMIGA_PARTITION=y
 CONFIG_OF_CONTROL=y

doc/develop/global_data.rst

+.. SPDX-License-Identifier: GPL-2.0+
+
+Global data
+===========
+
+Globally required fields are held in the global data structure. A pointer to the
+structure is available as symbol gd. The symbol is made available by the macro
+%DECLARE_GLOBAL_DATA_PTR.
+
+Register pointing to global data
+--------------------------------
+
+On most architectures the global data pointer is stored in a register.
+
++------------+----------+
+| ARC        | r25      |
++------------+----------+
+| ARM 32bit  | r9       |
++------------+----------+
+| ARM 64bit  | x18      |
++------------+----------+
+| M68000     | d7       |
++------------+----------+
+| MicroBlaze | r31      |
++------------+----------+
+| NDS32      | r10      |
++------------+----------+
+| Nios II    | gp       |
++------------+----------+
+| PowerPC    | r2       |
++------------+----------+
+| RISC-V     | gp (x3)  |
++------------+----------+
+| SuperH     | r13      |
++------------+----------+
+
+The sandbox, x86, and Xtensa are notable exceptions.
+
+Clang for ARM does not support assigning a global register. When using Clang
+gd is defined as an inline function using assembly code. This adds a few bytes
+to the code size.
+
+Binaries called by U-Boot are not aware of the register usage and will not
+conserve gd. UEFI binaries call the API provided by U-Boot and may return to
+U-Boot. The value of gd has to be saved every time U-Boot is left and restored
+whenever U-Boot is reentered. This is also relevant for the implementation of
+function tracing. For setting the value of gd function set_gd() can be used.
+
+Global data structure
+---------------------
+
+.. kernel-doc:: include/asm-generic/global_data.h
+   :internal:

doc/develop/index.rst

@@ -9,4 +9,5 @@ Develop U-Boot
 
    coccinelle
    crash_dumps
+   global_data
    logging

doc/index.rst

@@ -109,6 +109,13 @@ Android-specific features available in U-Boot.
 
    android/index
 
+Command line
+------------
+.. toctree::
+   :maxdepth: 2
+
+   pstore.rst
+
 Indices and tables
 ==================
 

doc/pstore.rst

+.. SPDX-License-Identifier: GPL-2.0+
+
+PStore command
+==============
+
+Design
+------
+
+Linux PStore and Ramoops modules (Linux config options PSTORE and PSTORE_RAM)
+allow to use memory to pass data from the dying breath of a crashing kernel to
+its successor. This command allows to read those records from U-Boot command
+line.
+
+Ramoops is an oops/panic logger that writes its logs to RAM before the system
+crashes. It works by logging oopses and panics in a circular buffer. Ramoops
+needs a system with persistent RAM so that the content of that area can survive
+after a restart.
+
+Ramoops uses a predefined memory area to store the dump.
+
+Ramoops parameters can be passed as kernel parameters or through Device Tree,
+i.e.::
+
+    ramoops.mem_address=0x30000000 ramoops.mem_size=0x100000 ramoops.record_size=0x2000 ramoops.console_size=0x2000 memmap=0x100000$0x30000000
+
+The same values should be set in U-Boot to be able to retrieve the records.
+This values can be set at build time in U-Boot configuration file, or at runtime.
+U-Boot automatically patches the Device Tree to pass the Ramoops parameters to
+the kernel.
+
+The PStore configuration parameters are:
+
+======================= ==========
+ Name                   Default
+======================= ==========
+CMD_PSTORE_MEM_ADDR
+CMD_PSTORE_MEM_SIZE     0x10000
+CMD_PSTORE_RECORD_SIZE  0x1000
+CMD_PSTORE_CONSOLE_SIZE 0x1000
+CMD_PSTORE_FTRACE_SIZE  0x1000
+CMD_PSTORE_PMSG_SIZE    0x1000
+CMD_PSTORE_ECC_SIZE     0
+======================= ==========
+
+Records sizes should be a power of 2.
+The memory size and the record/console size must be non-zero.
+
+Multiple 'dump' records can be stored in the memory reserved for PStore.
+The memory size has to be larger than the sum of the record sizes, i.e.::
+
+    MEM_SIZE >= RECORD_SIZE * n + CONSOLE_SIZE + FTRACE_SIZE + PMSG_SIZE
+
+Usage
+-----
+
+Generate kernel crash
+~~~~~~~~~~~~~~~~~~~~~
+
+For test purpose, you can generate a kernel crash by setting reboot timeout to
+10 seconds and trigger a panic::
+
+    $ sudo sh -c "echo 1 > /proc/sys/kernel/sysrq"
+    $ sudo sh -c "echo 10 > /proc/sys/kernel/panic"
+    $ sudo sh -c "echo c > /proc/sysrq-trigger"
+
+Retrieve logs in U-Boot
+~~~~~~~~~~~~~~~~~~~~~~~
+
+First of all, unless PStore parameters as been set during U-Boot configuration
+and match kernel ramoops parameters, it needs to be set using 'pstore set', e.g.::
+
+    => pstore set 0x30000000 0x100000 0x2000 0x2000
+
+Then all available dumps can be displayed
+using::
+
+    => pstore display
+
+Or saved to an existing directory in an Ext2 or Ext4 partition, e.g. on root
+directory of 1st partition of the 2nd MMC::
+
+    => pstore save mmc 1:1 /

doc/sphinx/cdomain.py

@@ -48,7 +48,10 @@ major, minor, patch = sphinx.version_info[:3]
 
 def setup(app):
 
+    if (major == 1 and minor < 8):
         app.override_domain(CDomain)
+    else:
+        app.add_domain(CDomain, override=True)
 
     return dict(
         version = __version__,

drivers/clk/rockchip/clk_rk3399.c

@@ -1592,7 +1592,7 @@ static int rk3399_pmuclk_ofdata_to_platdata(struct udevice *dev)
 
 static int rk3399_pmuclk_bind(struct udevice *dev)
 {
-#if CONFIG_IS_ENABLED(CONFIG_RESET_ROCKCHIP)
+#if CONFIG_IS_ENABLED(RESET_ROCKCHIP)
 	int ret;
 
 	ret = offsetof(struct rk3399_pmucru, pmucru_softrst_con[0]);

drivers/gpio/sandbox.c

@@ -185,6 +185,14 @@ static int sb_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
 
 	dir_flags = get_gpio_dir_flags(dev, offset);
 
+	/*
+	 * For testing purposes keep the output value when switching to input.
+	 * This allows us to manipulate the input value via the gpio command.
+	 */
+	if (flags & GPIOD_IS_IN)
+		*dir_flags = (flags & ~GPIOD_IS_OUT_ACTIVE) |
+			     (*dir_flags & GPIOD_IS_OUT_ACTIVE);
+	else
 		*dir_flags = flags;
 
 	return 0;

drivers/mmc/mmc.c

@@ -3111,3 +3111,12 @@ int mmc_set_bkops_enable(struct mmc *mmc)
 	return 0;
 }
 #endif
+
+__weak int mmc_get_env_dev(void)
+{
+#ifdef CONFIG_SYS_MMC_ENV_DEV
+	return CONFIG_SYS_MMC_ENV_DEV;
+#else
+	return 0;
+#endif
+}

drivers/net/e1000.c

@@ -1644,6 +1644,11 @@ e1000_reset_hw(struct e1000_hw *hw)
 	E1000_WRITE_REG(hw, TCTL, E1000_TCTL_PSP);
 	E1000_WRITE_FLUSH(hw);
 
+	if (hw->mac_type == e1000_igb) {
+		E1000_WRITE_REG(hw, RXPBS, I210_RXPBSIZE_DEFAULT);
+		E1000_WRITE_REG(hw, TXPBS, I210_TXPBSIZE_DEFAULT);
+	}
+
 	/* The tbi_compatibility_on Flag must be cleared when Rctl is cleared. */
 	hw->tbi_compatibility_on = false;
 

drivers/net/e1000.h

@@ -735,6 +735,7 @@ struct e1000_ffvt_entry {
 #define E1000_ERT      0x02008  /* Early Rx Threshold - RW */
 #define E1000_FCRTL    0x02160	/* Flow Control Receive Threshold Low - RW */
 #define E1000_FCRTH    0x02168	/* Flow Control Receive Threshold High - RW */
+#define E1000_RXPBS    0x02404  /* Rx Packet Buffer Size - RW */
 #define E1000_RDBAL    0x02800	/* RX Descriptor Base Address Low - RW */
 #define E1000_RDBAH    0x02804	/* RX Descriptor Base Address High - RW */
 #define E1000_RDLEN    0x02808	/* RX Descriptor Length - RW */
@@ -745,6 +746,7 @@ struct e1000_ffvt_entry {
 #define E1000_RADV     0x0282C	/* RX Interrupt Absolute Delay Timer - RW */
 #define E1000_RSRPD    0x02C00	/* RX Small Packet Detect - RW */
 #define E1000_TXDMAC   0x03000	/* TX DMA Control - RW */
+#define E1000_TXPBS	   0x03404  /* Tx Packet Buffer Size - RW */
 #define E1000_TDFH     0x03410  /* TX Data FIFO Head - RW */
 #define E1000_TDFT     0x03418  /* TX Data FIFO Tail - RW */
 #define E1000_TDFHS    0x03420  /* TX Data FIFO Head Saved - RW */
@@ -2589,4 +2591,8 @@ struct e1000_hw {
 
 #define E1000_CTRL_EXT_INT_TIMER_CLR  0x20000000 /* Clear Interrupt timers
 							after IMS clear */
+
+#define I210_RXPBSIZE_DEFAULT          0x000000A2 /* RXPBSIZE default */
+#define I210_TXPBSIZE_DEFAULT          0x04000014 /* TXPBSIZE default */
+
 #endif	/* _E1000_HW_H_ */

drivers/spi/nxp_fspi.c

@@ -520,7 +520,7 @@ static void nxp_fspi_prepare_lut(struct nxp_fspi *f,
 	fspi_writel(f, FSPI_LCKER_LOCK, f->iobase + FSPI_LCKCR);
 }
 
-#if CONFIG_IS_ENABLED(CONFIG_CLK)
+#if CONFIG_IS_ENABLED(CLK)
 static int nxp_fspi_clk_prep_enable(struct nxp_fspi *f)
 {
 	int ret;
@@ -808,7 +808,7 @@ static int nxp_fspi_default_setup(struct nxp_fspi *f)
 	int ret, i;
 	u32 reg;
 
-#if CONFIG_IS_ENABLED(CONFIG_CLK)
+#if CONFIG_IS_ENABLED(CLK)
 	/* disable and unprepare clock to avoid glitch pass to controller */
 	nxp_fspi_clk_disable_unprep(f);
 
@@ -898,7 +898,7 @@ static int nxp_fspi_claim_bus(struct udevice *dev)
 
 static int nxp_fspi_set_speed(struct udevice *bus, uint speed)
 {
-#if CONFIG_IS_ENABLED(CONFIG_CLK)
+#if CONFIG_IS_ENABLED(CLK)
 	struct nxp_fspi *f = dev_get_priv(bus);
 	int ret;
 
@@ -924,7 +924,7 @@ static int nxp_fspi_set_mode(struct udevice *bus, uint mode)
 static int nxp_fspi_ofdata_to_platdata(struct udevice *bus)
 {
 	struct nxp_fspi *f = dev_get_priv(bus);
-#if CONFIG_IS_ENABLED(CONFIG_CLK)
+#if CONFIG_IS_ENABLED(CLK)
 	int ret;
 #endif
 
@@ -950,7 +950,7 @@ static int nxp_fspi_ofdata_to_platdata(struct udevice *bus)
 	f->ahb_addr = map_physmem(ahb_addr, ahb_size, MAP_NOCACHE);
 	f->memmap_phy_size = ahb_size;
 
-#if CONFIG_IS_ENABLED(CONFIG_CLK)
+#if CONFIG_IS_ENABLED(CLK)
 	ret = clk_get_by_name(bus, "fspi_en", &f->clk_en);
 	if (ret) {
 		dev_err(bus, "failed to get fspi_en clock\n");

drivers/sysreset/sysreset_mpc83xx.c

@@ -106,7 +106,7 @@ static int print_83xx_arb_event(bool force, char *buf, int size)
 	if (!force && !gd->arch.arbiter_event_address)
 		return 0;
 
-	if (CONFIG_IS_ENABLED(CONFIG_DISPLAY_AER_FULL)) {
+	if (CONFIG_IS_ENABLED(DISPLAY_AER_FULL)) {
 		res = snprintf(buf, size,
 			       "Arbiter Event Status:\n"
 			       "    %s: 0x%08lX\n"
@@ -119,7 +119,7 @@ static int print_83xx_arb_event(bool force, char *buf, int size)
 			       "Master ID", mstr_id, master[mstr_id],
 			       "Transfer Size", tsize_val, tsize_bytes,
 			       "Transfer Type", ttype, transfer[ttype]);
-	} else if (CONFIG_IS_ENABLED(CONFIG_DISPLAY_AER_BRIEF)) {
+	} else if (CONFIG_IS_ENABLED(DISPLAY_AER_BRIEF)) {
 		res = snprintf(buf, size,
 			       "Arbiter Event Status: AEATR=0x%08lX, AEADR=0x%08lX\n",
 			       gd->arch.arbiter_event_attributes,
@@ -183,8 +183,8 @@ static int mpc83xx_sysreset_get_status(struct udevice *dev, char *buf, int size)
 	 * TODO(mario.six@gdsys.cc): Move this into a dedicated
 	 *			     arbiter driver
 	 */
-	if (CONFIG_IS_ENABLED(CONFIG_DISPLAY_AER_FULL) ||
-	    CONFIG_IS_ENABLED(CONFIG_DISPLAY_AER_BRIEF)) {
+	if (CONFIG_IS_ENABLED(DISPLAY_AER_FULL) ||
+	    CONFIG_IS_ENABLED(DISPLAY_AER_BRIEF)) {
 		/*
 		 * If there was a bus monitor reset event, we force the arbiter
 		 * event to be printed

env/Kconfig

@@ -477,6 +477,10 @@ config ENV_EXT4_DEVICE_AND_PART
 	                   If none, first valid partition in device D. If no
 	                   partition table then means device D.
 
+	  If ENV_EXT4_INTERFACE is set to "mmc" then device 'D' can be omitted,
+	  leaving the string starting with a colon, and the boot device will
+	  be used.
+
 config ENV_EXT4_FILE
 	string "Name of the EXT4 file to use for the environment"
 	depends on ENV_IS_IN_EXT4

env/ext4.c

@@ -41,7 +41,21 @@ __weak const char *env_ext4_get_intf(void)
 
 __weak const char *env_ext4_get_dev_part(void)
 {
+#ifdef CONFIG_MMC
+	static char *part_str;
+
+	if (!part_str) {
+		part_str = CONFIG_ENV_EXT4_DEVICE_AND_PART;
+		if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc") && part_str[0] == ':') {
+			part_str = "0" CONFIG_ENV_EXT4_DEVICE_AND_PART;
+			part_str[0] += mmc_get_env_dev();
+		}
+	}
+
+	return part_str;
+#else
 	return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
+#endif
 }
 
 static int env_ext4_save_buffer(env_t *env_new)

env/fat.c

@@ -29,15 +29,6 @@
 # define LOADENV
 #endif
 
-__weak int mmc_get_env_dev(void)
-{
-#ifdef CONFIG_SYS_MMC_ENV_DEV
-	return CONFIG_SYS_MMC_ENV_DEV;
-#else
-	return 0;
-#endif
-}
-
 static char *env_fat_device_and_part(void)
 {
 #ifdef CONFIG_MMC

env/mmc.c

@@ -24,11 +24,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-__weak int mmc_get_env_dev(void)
-{
-	return CONFIG_SYS_MMC_ENV_DEV;
-}
-
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 static inline int mmc_offset_try_partition(const char *str, int copy, s64 *val)
 {

include/asm-generic/global_data.h

@@ -24,149 +24,473 @@
 #include <membuff.h>
 #include <linux/list.h>
 
-typedef struct global_data {
+typedef struct global_data gd_t;
+
+/**
+ * struct global_data - global data structure
+ */
+struct global_data {
+	/**
+	 * @bd: board information
+	 */
 	struct bd_info *bd;
+	/**
+	 * @flags: global data flags
+	 *
+	 * See &enum gd_flags
+	 */
 	unsigned long flags;
+	/**
+	 * @baudrate: baud rate of the serial interface
+	 */
 	unsigned int baudrate;
-	unsigned long cpu_clk;		/* CPU clock in Hz!		*/
+	/**
+	 * @cpu_clk: CPU clock rate in Hz
+	 */
+	unsigned long cpu_clk;
+	/**
+	 * @bus_clk: platform clock rate in Hz
+	 */
 	unsigned long bus_clk;
+	/**
+	 * @pci_clk: PCI clock rate in Hz
+	 */
 	/* We cannot bracket this with CONFIG_PCI due to mpc5xxx */
 	unsigned long pci_clk;
+	/**
+	 * @mem_clk: memory clock rate in Hz
+	 */
 	unsigned long mem_clk;
 #if defined(CONFIG_LCD) || defined(CONFIG_VIDEO) || defined(CONFIG_DM_VIDEO)
-	unsigned long fb_base;		/* Base address of framebuffer mem */
+	/**
+	 * @fb_base: base address of frame buffer memory
+	 */
+	unsigned long fb_base;
 #endif
 #if defined(CONFIG_POST)
-	unsigned long post_log_word;	/* Record POST activities */
-	unsigned long post_log_res;	/* success of POST test */
-	unsigned long post_init_f_time;	/* When post_init_f started */
+	/**
+	 * @post_log_word: active POST tests
+	 *
+	 * @post_log_word is a bit mask defining which POST tests are recorded
+	 * (see constants POST_*).
+	 */
+	unsigned long post_log_word;
+	/**
+	 * @post_log_res: POST results
+	 *
+	 * @post_log_res is a bit mask with the POST results. A bit with value 1
+	 * indicates successful execution.
+	 */
+	unsigned long post_log_res;
+	/**
+	 * @post_init_f_time: time in ms when post_init_f() started
+	 */
+	unsigned long post_init_f_time;
 #endif
 #ifdef CONFIG_BOARD_TYPES
+	/**
+	 * @board_type: board type
+	 *
+	 * If a U-Boot configuration supports multiple board types, the actual
+	 * board type may be stored in this field.
+	 */
 	unsigned long board_type;
 #endif
-	unsigned long have_console;	/* serial_init() was called */
+	/**
+	 * @have_console: console is available
+	 *
+	 * A value of 1 indicates that serial_init() was called and a console
+	 * is available.
+	 * A value of 0 indicates that console input and output drivers shall
+	 * not be called.
+	 */
+	unsigned long have_console;
 #if CONFIG_IS_ENABLED(PRE_CONSOLE_BUFFER)
-	unsigned long precon_buf_idx;	/* Pre-Console buffer index */
+	/**
+	 * @precon_buf_idx: pre-console buffer index
+	 *
+	 * @precon_buf_idx indicates the current position of the buffer used to
+	 * collect output before the console becomes available
+	 */
+	unsigned long precon_buf_idx;
 #endif
-	unsigned long env_addr;		/* Address  of Environment struct */
-	unsigned long env_valid;	/* Environment valid? enum env_valid */
-	unsigned long env_has_init;	/* Bitmask of boolean of struct env_location offsets */
-	int env_load_prio;		/* Priority of the loaded environment */
-
-	unsigned long ram_base;		/* Base address of RAM used by U-Boot */
-	unsigned long ram_top;		/* Top address of RAM used by U-Boot */
-	unsigned long relocaddr;	/* Start address of U-Boot in RAM */
-	phys_size_t ram_size;		/* RAM size */
-	unsigned long mon_len;		/* monitor len */
-	unsigned long irq_sp;		/* irq stack pointer */
-	unsigned long start_addr_sp;	/* start_addr_stackpointer */
+	/**
+	 * @env_addr: address of environment structure
+	 *
+	 * @env_addr contains the address of the structure holding the
+	 * environment variables.
+	 */
+	unsigned long env_addr;
+	/**
+	 * @env_valid: environment is valid
+	 *
+	 * See &enum env_valid
+	 */
+	unsigned long env_valid;
+	/**
+	 * @env_has_init: bit mask indicating environment locations
+	 *
+	 * &enum env_location defines which bit relates to which location
+	 */
+	unsigned long env_has_init;
+	/**
+	 * @env_load_prio: priority of the loaded environment
+	 */
+	int env_load_prio;
+	/**
+	 * @ram_base: base address of RAM used by U-Boot
+	 */
+	unsigned long ram_base;
+	/**
+	 * @ram_top: top address of RAM used by U-Boot
+	 */
+	unsigned long ram_top;
+	/**
+	 * @relocaddr: start address of U-Boot in RAM
+	 *
+	 * After relocation this field indicates the address to which U-Boot
+	 * has been relocated. It can be displayed using the bdinfo command.
+	 * Its value is needed to display the source code when debugging with
+	 * GDB using the 'add-symbol-file u-boot <relocaddr>' command.
+	 */
+	unsigned long relocaddr;
+	/**
+	 * @ram_size: RAM size in bytes
+	 */
+	phys_size_t ram_size;
+	/**
+	 * @mon_len: monitor length in bytes
+	 */
+	unsigned long mon_len;
+	/**
+	 * @irq_sp: IRQ stack pointer
+	 */
+	unsigned long irq_sp;
+	/**
+	 * @start_addr_sp: initial stack pointer address
+	 */
+	unsigned long start_addr_sp;
+	/**
+	 * @reloc_off: relocation offset
+	 */
 	unsigned long reloc_off;
-	struct global_data *new_gd;	/* relocated global data */
+	/**
+	 * @new_gd: pointer to relocated global data
+	 */
+	struct global_data *new_gd;
 
 #ifdef CONFIG_DM
-	struct udevice	*dm_root;	/* Root instance for Driver Model */
-	struct udevice	*dm_root_f;	/* Pre-relocation root instance */
-	struct list_head uclass_root;	/* Head of core tree */
+	/**
+	 * @dm_root: root instance for Driver Model
+	 */
+	struct udevice *dm_root;
+	/**
+	 * @dm_root_f: pre-relocation root instance
+	 */
+	struct udevice *dm_root_f;
+	/**
+	 * @uclass_root: head of core tree
+	 */
+	struct list_head uclass_root;
 #endif
 #ifdef CONFIG_TIMER
-	struct udevice	*timer;		/* Timer instance for Driver Model */
+	/**
+	 * @timer: timer instance for Driver Model
+	 */
+	struct udevice *timer;
 #endif
-
-	const void *fdt_blob;		/* Our device tree, NULL if none */
-	void *new_fdt;			/* Relocated FDT */
-	unsigned long fdt_size;		/* Space reserved for relocated FDT */
+	/**
+	 * @fdt_blob: U-Boot's own device tree, NULL if none
+	 */
+	const void *fdt_blob;
+	/**
+	 * @new_fdt: relocated device tree
+	 */
+	void *new_fdt;
+	/**
+	 * @fdt_size: space reserved for relocated device space
+	 */
+	unsigned long fdt_size;
 #ifdef CONFIG_OF_LIVE
+	/**
+	 * @of_root: root node of the live tree
+	 */
 	struct device_node *of_root;
 #endif
 
 #if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
-	const void *multi_dtb_fit;	/* uncompressed multi-dtb FIT image */
+	/**
+	 * @multi_dtb_fit: pointer to uncompressed multi-dtb FIT image
+	 */
+	const void *multi_dtb_fit;
 #endif
-	struct jt_funcs *jt;		/* jump table */
-	char env_buf[32];		/* buffer for env_get() before reloc. */
+	/**
+	 * @jt: jump table
+	 *
+	 * The jump table contains pointers to exported functions. A pointer to
+	 * the jump table is passed to standalone applications.
+	 */
+	struct jt_funcs *jt;
+	/**
+	 * @env_buf: buffer for env_get() before reloc
+	 */
+	char env_buf[32];
 #ifdef CONFIG_TRACE
-	void		*trace_buff;	/* The trace buffer */
+	/**
+	 * @trace_buff: trace buffer
+	 *
+	 * When tracing function in U-Boot this field points to the buffer
+	 * recording the function calls.
+	 */
+	void *trace_buff;
 #endif
 #if defined(CONFIG_SYS_I2C)
-	int		cur_i2c_bus;	/* current used i2c bus */
+	/**
+	 * @cur_i2c_bus: currently used I2C bus
+	 */
+	int cur_i2c_bus;
 #endif
+	/**
+	 * @timebase_h: high 32 bits of timer
+	 */
 	unsigned int timebase_h;
+	/**
+	 * @timebase_l: low 32 bits of timer
+	 */
 	unsigned int timebase_l;
 #if CONFIG_VAL(SYS_MALLOC_F_LEN)
-	unsigned long malloc_base;	/* base address of early malloc() */
-	unsigned long malloc_limit;	/* limit address */
-	unsigned long malloc_ptr;	/* current address */
+	/**
+	 * @malloc_base: base address of early malloc()
+	 */
+	unsigned long malloc_base;
+	/**
+	 * @malloc_limit: limit address of early malloc()
+	 */
+	unsigned long malloc_limit;
+	/**
+	 * @malloc_ptr: current address of early malloc()
+	 */
+	unsigned long malloc_ptr;
 #endif
 #ifdef CONFIG_PCI
-	struct pci_controller *hose;	/* PCI hose for early use */
-	phys_addr_t pci_ram_top;	/* top of region accessible to PCI */
+	/**
+	 * @hose: PCI hose for early use
+	 */
+	struct pci_controller *hose;
+	/**
+	 * @pci_ram_top: top of region accessible to PCI
+	 */
+	phys_addr_t pci_ram_top;
 #endif
 #ifdef CONFIG_PCI_BOOTDELAY
+	/**
+	 * @pcidelay_done: delay time before scanning of PIC hose expired
+	 *
+	 * If CONFIG_PCI_BOOTDELAY=y, pci_hose_scan() waits for the number of
+	 * milliseconds defined by environment variable pcidelay before
+	 * scanning. Once this delay has expired the flag @pcidelay_done
+	 * is set to 1.
+	 */
 	int pcidelay_done;
 #endif
-	struct udevice *cur_serial_dev;	/* current serial device */
-	struct arch_global_data arch;	/* architecture-specific data */
+	/**
+	 * @cur_serial_dev: current serial device
+	 */
+	struct udevice *cur_serial_dev;
+	/**
+	 * @arch: architecture-specific data
+	 */
+	struct arch_global_data arch;
 #ifdef CONFIG_CONSOLE_RECORD
-	struct membuff console_out;	/* console output */
-	struct membuff console_in;	/* console input */
+	/**
+	 * @console_out: output buffer for console recording
+	 *
+	 * This buffer is used to collect output during console recording.
+	 */
+	struct membuff console_out;
+	/**
+	 * @console_in: input buffer for console recording
+	 *
+	 * If console recording is activated, this buffer can be used to
+	 * emulate input.
+	 */
+	struct membuff console_in;
 #endif
 #ifdef CONFIG_DM_VIDEO
-	ulong video_top;		/* Top of video frame buffer area */
-	ulong video_bottom;		/* Bottom of video frame buffer area */
+	/**
+	 * @video_top: top of video frame buffer area
+	 */
+	ulong video_top;
+	/**
+	 * @video_bottom: bottom of video frame buffer area
+	 */
+	ulong video_bottom;
 #endif
 #ifdef CONFIG_BOOTSTAGE
-	struct bootstage_data *bootstage;	/* Bootstage information */
-	struct bootstage_data *new_bootstage;	/* Relocated bootstage info */
+	/**
+	 * @bootstage: boot stage information
+	 */
+	struct bootstage_data *bootstage;
+	/**
+	 * @new_bootstage: relocated boot stage information
+	 */
+	struct bootstage_data *new_bootstage;
 #endif
 #ifdef CONFIG_LOG
-	int log_drop_count;		/* Number of dropped log messages */
-	int default_log_level;		/* For devices with no filters */
-	struct list_head log_head;	/* List of struct log_device */
-	int log_fmt;			/* Mask containing log format info */
+	/**
+	 * @log_drop_count: number of dropped log messages
+	 *
+	 * This counter is incremented for each log message which can not
+	 * be processed because logging is not yet available as signaled by
+	 * flag %GD_FLG_LOG_READY in @flags.
+	 */
+	int log_drop_count;
+	/**
+	 * @default_log_level: default logging level
+	 *
+	 * For logging devices without filters @default_log_level defines the
+	 * logging level, cf. &enum log_level_t.
+	 */
+	int default_log_level;
+	/**
+	 * @log_head: list of logging devices
+	 */
+	struct list_head log_head;
+	/**
+	 * @log_fmt: bit mask for logging format
+	 *
+	 * The @log_fmt bit mask selects the fields to be shown in log messages.
+	 * &enum log_fmt defines the bits of the bit mask.
+	 */
+	int log_fmt;
 #endif
 #if CONFIG_IS_ENABLED(BLOBLIST)
-	struct bloblist_hdr *bloblist;	/* Bloblist information */
-	struct bloblist_hdr *new_bloblist;	/* Relocated blolist info */
+	/**
+	 * @bloblist: blob list information
+	 */
+	struct bloblist_hdr *bloblist;
+	/**
+	 * @new_bloblist: relocated blob list information
+	 */
+	struct bloblist_hdr *new_bloblist;
 # ifdef CONFIG_SPL
+	/**
+	 * @spl_handoff: SPL hand-off information
+	 */
 	struct spl_handoff *spl_handoff;
 # endif
 #endif
 #if defined(CONFIG_TRANSLATION_OFFSET)
-	fdt_addr_t translation_offset;	/* optional translation offset */
+	/**
+	 * @translation_offset: optional translation offset
+	 *
+	 * See CONFIG_TRANSLATION_OFFSET.
+	 */
+	fdt_addr_t translation_offset;
 #endif
 #if CONFIG_IS_ENABLED(WDT)
+	/**
+	 * @watchdog_dev: watchdog device
+	 */
 	struct udevice *watchdog_dev;
 #endif
-} gd_t;
-#endif
+};
 
+/**
+ * gd_board_type() - retrieve board type
+ *
+ * Return: global board type
+ */
 #ifdef CONFIG_BOARD_TYPES
 #define gd_board_type()		gd->board_type
 #else
 #define gd_board_type()		0
 #endif
 
-/*
- * Global Data Flags
- */
-#define GD_FLG_RELOC		0x00001	/* Code was relocated to RAM	   */
-#define GD_FLG_DEVINIT		0x00002	/* Devices have been initialized   */
-#define GD_FLG_SILENT		0x00004	/* Silent mode			   */
-#define GD_FLG_POSTFAIL		0x00008	/* Critical POST test failed	   */
-#define GD_FLG_POSTSTOP		0x00010	/* POST seqeunce aborted	   */
-#define GD_FLG_LOGINIT		0x00020	/* Log Buffer has been initialized */
-#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)	   */
-#define GD_FLG_ENV_READY	0x00080	/* Env. imported into hash table   */
-#define GD_FLG_SERIAL_READY	0x00100	/* Pre-reloc serial console ready  */
-#define GD_FLG_FULL_MALLOC_INIT	0x00200	/* Full malloc() is ready	   */
-#define GD_FLG_SPL_INIT		0x00400	/* spl_init() has been called	   */
-#define GD_FLG_SKIP_RELOC	0x00800	/* Don't relocate		   */
-#define GD_FLG_RECORD		0x01000	/* Record console		   */
-#define GD_FLG_ENV_DEFAULT	0x02000 /* Default variable flag	   */
-#define GD_FLG_SPL_EARLY_INIT	0x04000 /* Early SPL init is done	   */
-#define GD_FLG_LOG_READY	0x08000 /* Log system is ready for use	   */
-#define GD_FLG_WDT_READY	0x10000 /* Watchdog is ready for use	   */
-#define GD_FLG_SKIP_LL_INIT	0x20000	/* Don't perform low-level init	   */
-#define GD_FLG_SMP_READY	0x40000	/* SMP init is complete		   */
+/**
+ * enum gd_flags - global data flags
+ *
+ * See field flags of &struct global_data.
+ */
+enum gd_flags {
+	/**
+	 * @GD_FLG_RELOC: code was relocated to RAM
+	 */
+	GD_FLG_RELOC = 0x00001,
+	/**
+	 * @GD_FLG_DEVINIT: devices have been initialized
+	 */
+	GD_FLG_DEVINIT = 0x00002,
+	/**
+	 * @GD_FLG_SILENT: silent mode
+	 */
+	GD_FLG_SILENT = 0x00004,
+	/**
+	 * @GD_FLG_POSTFAIL: critical POST test failed
+	 */
+	GD_FLG_POSTFAIL = 0x00008,
+	/**
+	 * @GD_FLG_POSTSTOP: POST sequence aborted
+	 */
+	GD_FLG_POSTSTOP = 0x00010,
+	/**
+	 * @GD_FLG_LOGINIT: log Buffer has been initialized
+	 */
+	GD_FLG_LOGINIT = 0x00020,
+	/**
+	 * @GD_FLG_DISABLE_CONSOLE: disable console (in & out)
+	 */
+	GD_FLG_DISABLE_CONSOLE = 0x00040,
+	/**
+	 * @GD_FLG_ENV_READY: environment imported into hash table
+	 */
+	GD_FLG_ENV_READY = 0x00080,
+	/**
+	 * @GD_FLG_SERIAL_READY: pre-relocation serial console ready
+	 */
+	GD_FLG_SERIAL_READY = 0x00100,
+	/**
+	 * @GD_FLG_FULL_MALLOC_INIT: full malloc() is ready
+	 */
+	GD_FLG_FULL_MALLOC_INIT = 0x00200,
+	/**
+	 * @GD_FLG_SPL_INIT: spl_init() has been called
+	 */
+	GD_FLG_SPL_INIT = 0x00400,
+	/**
+	 * @GD_FLG_SKIP_RELOC: don't relocate
+	 */
+	GD_FLG_SKIP_RELOC = 0x00800,
+	/**
+	 * @GD_FLG_RECORD: record console
+	 */
+	GD_FLG_RECORD = 0x01000,
+	/**
+	 * @GD_FLG_ENV_DEFAULT: default variable flag
+	 */
+	GD_FLG_ENV_DEFAULT = 0x02000,
+	/**
+	 * @GD_FLG_SPL_EARLY_INIT: early SPL initialization is done
+	 */
+	GD_FLG_SPL_EARLY_INIT = 0x04000,
+	/**
+	 * @GD_FLG_LOG_READY: log system is ready for use
+	 */
+	GD_FLG_LOG_READY = 0x08000,
+	/**
+	 * @GD_FLG_WDT_READY: watchdog is ready for use
+	 */
+	GD_FLG_WDT_READY = 0x10000,
+	/**
+	 * @GD_FLG_SKIP_LL_INIT: don't perform low-level initialization
+	 */
+	GD_FLG_SKIP_LL_INIT = 0x20000,
+	/**
+	 * @GD_FLG_SMP_READY: SMP initialization is complete
+	 */
+	GD_FLG_SMP_READY = 0x40000,
+};
+
+#endif /* __ASSEMBLY__ */
 
 #endif /* __ASM_GENERIC_GBL_DATA_H */

include/bootm.h

@@ -75,4 +75,14 @@ void board_quiesce_devices(void);
  */
 void switch_to_non_secure_mode(void);
 
+/**
+ * arch_preboot_os() - arch specific configuration before booting
+ */
+void arch_preboot_os(void);
+
+/**
+ * board_preboot_os() - board specific configuration before booting
+ */
+void board_preboot_os(void);
+
 #endif

include/fdt_support.h

@@ -359,4 +359,7 @@ int fdt_update_ethernet_dt(void *blob);
 #ifdef CONFIG_FSL_MC_ENET
 void fdt_fixup_board_enet(void *blob);
 #endif
+#ifdef CONFIG_CMD_PSTORE
+void fdt_fixup_pstore(void *blob);
+#endif
 #endif /* ifndef __FDT_SUPPORT_H */

lib/time.c

@@ -91,13 +91,13 @@ uint64_t notrace get_ticks(void)
 
 		ret = dm_timer_init();
 		if (ret)
-			return ret;
+			panic("Could not initialize timer (err %d)\n", ret);
 #endif
 	}
 
 	ret = timer_get_count(gd->timer, &count);
 	if (ret)
-		return ret;
+		panic("Could not read count from timer (err %d)\n", ret);
 
 	return count;
 }

scripts/checkpatch.pl

@@ -2365,6 +2365,12 @@ sub u_boot_line {
 		ERROR("DISABLE_FDT_OR_INITRD_RELOC",
 		     "fdt or initrd relocation disabled at boot time\n" . $herecurr);
 	}
+
+	# Do not use CONFIG_ prefix in CONFIG_IS_ENABLED() calls
+	if ($line =~ /^\+.*CONFIG_IS_ENABLED\(CONFIG_\w*\).*/) {
+		ERROR("CONFIG_IS_ENABLED_CONFIG",
+		      "CONFIG_IS_ENABLED() takes values without the CONFIG_ prefix\n" . $herecurr);
+	}
 }
 
 sub process {

test/dm/button.c

@@ -57,17 +57,17 @@ static int dm_test_button_label(struct unit_test_state *uts)
 {
 	struct udevice *dev, *cmp;
 
-	ut_assertok(button_get_by_label("summer", &dev));
+	ut_assertok(button_get_by_label("button1", &dev));
 	ut_asserteq(1, device_active(dev));
 	ut_assertok(uclass_get_device(UCLASS_BUTTON, 1, &cmp));
 	ut_asserteq_ptr(dev, cmp);
 
-	ut_assertok(button_get_by_label("christmas", &dev));
+	ut_assertok(button_get_by_label("button2", &dev));
 	ut_asserteq(1, device_active(dev));
 	ut_assertok(uclass_get_device(UCLASS_BUTTON, 2, &cmp));
 	ut_asserteq_ptr(dev, cmp);
 
-	ut_asserteq(-ENODEV, button_get_by_label("spring", &dev));
+	ut_asserteq(-ENODEV, button_get_by_label("nobutton", &dev));
 
 	return 0;
 }

test/py/tests/test_button.py

@@ -4,16 +4,34 @@ import pytest
 
 @pytest.mark.boardspec('sandbox')
 @pytest.mark.buildconfigspec('cmd_button')
-def test_button_exit_statuses(u_boot_console):
-    """Test that non-input button commands correctly return the command
-    success/failure status."""
+def test_button_list(u_boot_console):
+    """Test listing buttons"""
 
-    expected_response = 'rc:0'
     response = u_boot_console.run_command('button list; echo rc:$?')
-    assert(expected_response in response)
-    response = u_boot_console.run_command('button summer; echo rc:$?')
-    assert(expected_response in response)
+    assert('button1' in response)
+    assert('button2' in response)
+    assert('rc:0' in response)
+
+@pytest.mark.boardspec('sandbox')
+@pytest.mark.buildconfigspec('cmd_button')
+@pytest.mark.buildconfigspec('cmd_gpio')
+def test_button_return_code(u_boot_console):
+    """Test correct reporting of the button status
+
+    The sandbox gpio driver reports the last output value as input value.
+    We can use this in our test to emulate different input statuses.
+    """
+
+    u_boot_console.run_command('gpio set a3; gpio input a3');
+    response = u_boot_console.run_command('button button1; echo rc:$?')
+    assert('on' in response)
+    assert('rc:0' in response)
+
+    u_boot_console.run_command('gpio clear a3; gpio input a3');
+    response = u_boot_console.run_command('button button1; echo rc:$?')
+    assert('off' in response)
+    assert('rc:1' in response)
 
-    expected_response = 'rc:1'
     response = u_boot_console.run_command('button nonexistent-button; echo rc:$?')
-    assert(expected_response in response)
+    assert('not found' in response)
+    assert('rc:1' in response)

test/py/tests/test_pstore.py

+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (c) 2020, Collabora
+# Author: Frédéric Danis <frederic.danis@collabora.com>
+
+import pytest
+import u_boot_utils
+import os
+import tempfile
+import shutil
+
+PSTORE_ADDR=0x3000000
+PSTORE_LENGTH=0x100000
+PSTORE_PANIC1='test/py/tests/test_pstore_data_panic1.hex'
+PSTORE_PANIC2='test/py/tests/test_pstore_data_panic2.hex'
+PSTORE_CONSOLE='test/py/tests/test_pstore_data_console.hex'
+ADDR=0x01000008
+
+def load_pstore(u_boot_console):
+    """Load PStore records from sample files"""
+
+    output = u_boot_console.run_command_list([
+        'host load hostfs - 0x%x %s' % (PSTORE_ADDR,
+            os.path.join(u_boot_console.config.source_dir, PSTORE_PANIC1)),
+        'host load hostfs - 0x%x %s' % (PSTORE_ADDR + 4096,
+            os.path.join(u_boot_console.config.source_dir, PSTORE_PANIC2)),
+        'host load hostfs - 0x%x %s' % (PSTORE_ADDR + 253 * 4096,
+            os.path.join(u_boot_console.config.source_dir, PSTORE_CONSOLE)),
+        'pstore set 0x%x 0x%x' % (PSTORE_ADDR, PSTORE_LENGTH)])
+
+def checkfile(u_boot_console, path, filesize, checksum):
+    """Check file against MD5 checksum"""
+
+    output = u_boot_console.run_command_list([
+        'load hostfs - %x %s' % (ADDR, path),
+        'printenv filesize'])
+    assert('filesize=%x' % (filesize) in ''.join(output))
+
+    output = u_boot_console.run_command_list([
+        'md5sum %x $filesize' % ADDR,
+        'setenv filesize'])
+    assert(checksum in ''.join(output))
+
+@pytest.mark.buildconfigspec('cmd_pstore')
+def test_pstore_display_all_records(u_boot_console):
+    """Test that pstore displays all records."""
+
+    u_boot_console.run_command('')
+    load_pstore(u_boot_console)
+    response = u_boot_console.run_command('pstore display')
+    assert('**** Dump' in response)
+    assert('**** Console' in response)
+
+@pytest.mark.buildconfigspec('cmd_pstore')
+def test_pstore_display_one_record(u_boot_console):
+    """Test that pstore displays only one record."""
+
+    u_boot_console.run_command('')
+    load_pstore(u_boot_console)
+    response = u_boot_console.run_command('pstore display dump 1')
+    assert('Panic#2 Part1' in response)
+    assert('**** Console' not in response)
+
+@pytest.mark.buildconfigspec('cmd_pstore')
+def test_pstore_save_records(u_boot_console):
+    """Test that pstore saves all records."""
+
+    outdir = tempfile.mkdtemp()
+
+    u_boot_console.run_command('')
+    load_pstore(u_boot_console)
+    u_boot_console.run_command('pstore save hostfs - %s' % (outdir))
+
+    checkfile(u_boot_console, '%s/dmesg-ramoops-0' % (outdir), 3798, '8059335ab4cfa62c77324c491659c503')
+    checkfile(u_boot_console, '%s/dmesg-ramoops-1' % (outdir), 4035, '3ff30df3429d81939c75d0070b5187b9')
+    checkfile(u_boot_console, '%s/console-ramoops-0' % (outdir), 4084, 'bb44de4a9b8ebd9b17ae98003287325b')
+
+    shutil.rmtree(outdir)

tools/patman/test_checkpatch.py

@@ -405,6 +405,12 @@ index 0000000..2234c87
         pm.add_line('include/myfile.h', '#include <dm.h>')
         self.checkSingleMessage(pm, 'BARRED_INCLUDE_IN_HDR', 'error')
 
+    def testConfigIsEnabledConfig(self):
+        """Test for accidental CONFIG_IS_ENABLED(CONFIG_*) calls"""
+        pm = PatchMaker()
+        pm.add_line('common/main.c', 'if (CONFIG_IS_ENABLED(CONFIG_CLK))')
+        self.checkSingleMessage(pm, 'CONFIG_IS_ENABLED_CONFIG', 'error')
+
 
 if __name__ == "__main__":
     unittest.main()