[PATCH 3/4] cmd: mvebu: bubt: verify A38x target device type

[Joel Johnson]

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 branch.

Signed-off-by: Joel Johnson <mrjoel at lixil.net>
---

 cmd/mvebu/bubt.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/cmd/mvebu/bubt.c b/cmd/mvebu/bubt.c
index b80b81c82a..78061a6a2d 100644
--- a/cmd/mvebu/bubt.c
+++ b/cmd/mvebu/bubt.c
@@ -107,6 +107,26 @@ struct a38x_main_hdr_v1 {
 	u8  ext;                   /* 0x1E      */
 	u8  checksum;              /* 0x1F      */
 };
+
+#define A38X_BOOT_MODE_MAX	8
+
+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[A38X_BOOT_MODE_MAX] = {
+	{ 0x4D, "i2c"  },
+	{ 0x5A, "spi"  },
+	{ 0x69, "uart" },
+	{ 0x78, "sata" },
+	{ 0x8B, "nand" },
+	{ 0x9C, "pex"  },
+	{ 0xAE, "mmc"  },
+	{},
+};
+
 #endif
 
 struct bubt_dev {
@@ -644,6 +664,23 @@ static int check_image_header(void)
 	return 0;
 }
 #elif defined(CONFIG_ARMADA_38X)
+static int a38x_check_boot_mode(const struct bubt_dev *dst)
+{
+	int mode;
+	const struct a38x_main_hdr_v1 *hdr =
+		(struct a38x_main_hdr_v1 *)get_load_addr();
+
+	for (mode = 0; mode < A38X_BOOT_MODE_MAX; mode++) {
+		if (strcmp(a38x_boot_modes[mode].name, dst->name) == 0)
+			break;
+	}
+
+	if (a38x_boot_modes[mode].id == hdr->blockid)
+		return 0;
+
+	return -ENOEXEC;
+}
+
 static size_t a38x_header_size(const struct a38x_main_hdr_v1 *h)
 {
 	if (h->version == 1)
@@ -697,7 +734,7 @@ static int check_image_header(void)
 }
 #endif
 
-static int bubt_verify(size_t image_size)
+static int bubt_verify(const struct bubt_dev *dst)
 {
 	int err;
 
@@ -708,6 +745,14 @@ static int bubt_verify(size_t image_size)
 		return err;
 	}
 
+#if defined(CONFIG_ARMADA_38X)
+	err = a38x_check_boot_mode(dst);
+	if (err) {
+		puts("Error: image not built for destination device!\n");
+		return err;
+	}
+#endif
+
 	return 0;
 }
 
@@ -829,7 +874,7 @@ 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;
 
-- 
2.20.1