Merge tag 'efi-2020-01-rc4' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-01-rc4

Fix errors due to unaligned memory access:
* disable UEFI except for ARMv8, ARMv7, ARM11
* enable unaligned access support on ARM11

Remove an unused function.

arch/arm/cpu/arm11/Makefile

@@ -4,3 +4,7 @@
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
 obj-y	= cpu.o
+
+ifneq ($(CONFIG_SPL_BUILD),y)
+obj-$(CONFIG_EFI_LOADER) += sctlr.o
+endif

arch/arm/cpu/arm11/sctlr.S

+/* SPDX-License-Identifier:	GPL-2.0+ */
+/*
+ *  Routines to access the system control register
+ *
+ *  Copyright (c) 2019 Heinrich Schuchardt
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * void allow_unaligned(void) - allow unaligned access
+ *
+ * This routine sets the enable unaligned data support flag and clears the
+ * aligned flag in the system control register.
+ * After calling this routine unaligned access does no longer leads to a
+ * data abort or undefined behavior but is handled by the CPU.
+ * For details see the "ARM Architecture Reference Manual" for ARMv6.
+ */
+ENTRY(allow_unaligned)
+	mrc	p15, 0, r0, c1, c0, 0	@ load system control register
+	orr	r0, r0, #1 << 22	@ set unaligned data support flag
+	bic	r0, r0, #2		@ clear aligned flag
+	mcr	p15, 0, r0, c1, c0, 0	@ write system control register
+	bx	lr			@ return
+ENDPROC(allow_unaligned)

include/efi_loader.h

@@ -543,7 +543,6 @@ struct efi_device_path *efi_dp_get_next_instance(struct efi_device_path **dp,
 /* Check if a device path contains muliple instances */
 bool efi_dp_is_multi_instance(const struct efi_device_path *dp);
 
-struct efi_device_path *efi_dp_from_dev(struct udevice *dev);
 struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part);
 /* Create a device node for a block device partition. */
 struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part);

lib/efi_loader/Kconfig

 config EFI_LOADER
 	bool "Support running UEFI applications"
-	depends on (ARM || X86 || RISCV || SANDBOX) && OF_LIBFDT
+	depends on OF_LIBFDT && ( \
+		ARM && (SYS_CPU = arm1136 || \
+			SYS_CPU = arm1176 || \
+			SYS_CPU = armv7   || \
+			SYS_CPU = armv8)  || \
+		X86 || RISCV || SANDBOX)
 	# We need EFI_STUB_64BIT to be set on x86_64 with EFI_STUB
 	depends on !EFI_STUB || !X86_64 || EFI_STUB_64BIT
 	# We need EFI_STUB_32BIT to be set on x86_32 with EFI_STUB

lib/efi_loader/efi_device_path.c

@@ -422,7 +422,7 @@ bool efi_dp_is_multi_instance(const struct efi_device_path *dp)
 /* size of device-path not including END node for device and all parents
  * up to the root device.
  */
-static unsigned dp_size(struct udevice *dev)
+__maybe_unused static unsigned int dp_size(struct udevice *dev)
 {
 	if (!dev || !dev->driver)
 		return sizeof(ROOT);
@@ -494,7 +494,7 @@ static unsigned dp_size(struct udevice *dev)
  * @dev		device
  * @return	pointer to the end of the device path
  */
-static void *dp_fill(void *buf, struct udevice *dev)
+__maybe_unused static void *dp_fill(void *buf, struct udevice *dev)
 {
 	if (!dev || !dev->driver)
 		return buf;
@@ -654,20 +654,6 @@ static void *dp_fill(void *buf, struct udevice *dev)
 		return dp_fill(buf, dev->parent);
 	}
 }
-
-/* Construct a device-path from a device: */
-struct efi_device_path *efi_dp_from_dev(struct udevice *dev)
-{
-	void *buf, *start;
-
-	start = buf = dp_alloc(dp_size(dev) + sizeof(END));
-	if (!buf)
-		return NULL;
-	buf = dp_fill(buf, dev);
-	*((struct efi_device_path *)buf) = END;
-
-	return start;
-}
 #endif
 
 static unsigned dp_part_size(struct blk_desc *desc, int part)