cmd: mvebu: bubt: verify A38x target device type

Ensure that the device to which an image is being written includes
header information indicating boot support for the destination
device.

This is derived from the support in the SolidRun master-a38x vendor
fork.
Signed-off-by: NJoel Johnson <mrjoel@lixil.net>
Reviewed-by: NStefan Roese <sr@denx.de>

cmd/mvebu/bubt.c

@@ -85,7 +85,7 @@ struct mvebu_image_info {
 	u32	encrypt_start_offset;
 	u32	encrypt_size;
 };
-#elif defined(CONFIG_ARMADA_38X)	/* A38X */
+#endif
 
 /* Structure of the main header, version 1 (Armada 370/38x/XP) */
 struct a38x_main_hdr_v1 {
@@ -107,7 +107,23 @@ struct a38x_main_hdr_v1 {
 	u8  ext;                   /* 0x1E      */
 	u8  checksum;              /* 0x1F      */
 };
-#endif
+
+struct a38x_boot_mode {
+	unsigned int id;
+	const char *name;
+};
+
+/* The blockid header field values used to indicate boot device of image */
+struct a38x_boot_mode a38x_boot_modes[] = {
+	{ 0x4D, "i2c"  },
+	{ 0x5A, "spi"  },
+	{ 0x69, "uart" },
+	{ 0x78, "sata" },
+	{ 0x8B, "nand" },
+	{ 0x9C, "pex"  },
+	{ 0xAE, "mmc"  },
+	{},
+};
 
 struct bubt_dev {
 	char name[8];
@@ -697,7 +713,29 @@ static int check_image_header(void)
 }
 #endif
 
-static int bubt_verify(size_t image_size)
+static int bubt_check_boot_mode(const struct bubt_dev *dst)
+{
+	if (IS_ENABLED(CONFIG_ARMADA_38X)) {
+		int mode;
+		const struct a38x_main_hdr_v1 *hdr =
+			(struct a38x_main_hdr_v1 *)get_load_addr();
+
+		for (mode = 0; mode < ARRAY_SIZE(a38x_boot_modes); mode++) {
+			if (strcmp(a38x_boot_modes[mode].name, dst->name) == 0)
+				break;
+		}
+
+		if (a38x_boot_modes[mode].id == hdr->blockid)
+			return 0;
+
+		puts("Error: A38x image not built for destination device!\n");
+		return -ENOEXEC;
+	} else {
+		return 0;
+	}
+}
+
+static int bubt_verify(const struct bubt_dev *dst)
 {
 	int err;
 
@@ -708,6 +746,12 @@ static int bubt_verify(size_t image_size)
 		return err;
 	}
 
+	err = bubt_check_boot_mode(dst);
+	if (err) {
+		printf("Error: Image boot mode verification failed\n");
+		return err;
+	}
+
 	return 0;
 }
 
@@ -829,7 +873,7 @@ int do_bubt_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if (!image_size)
 		return -EIO;
 
-	err = bubt_verify(image_size);
+	err = bubt_verify(dst);
 	if (err)
 		return err;