[PATCH v6 1/5] cmd: mvebu: bubt: add A38x support

[Joel Johnson]

Add support for Armada 38x devices in bubt flashing utility.
This is based on (and streamlined from) the support in the SolidRun
master-a38x vendor fork.

Signed-off-by: Joel Johnson <mrjoel at lixil.net>
Reviewed-by: Stefan Roese <sr at denx.de>

---

v2 changes
  - none
v3 changes
  - none
v4 changes
  - none
v5 changes
  - none
v6 changes
  - none

---
 cmd/mvebu/bubt.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 68 insertions(+), 1 deletion(-)

diff --git a/cmd/mvebu/bubt.c b/cmd/mvebu/bubt.c
index 2041a7a29a..d399fb6da4 100644
--- a/cmd/mvebu/bubt.c
+++ b/cmd/mvebu/bubt.c
@@ -85,7 +85,29 @@ struct mvebu_image_info {
 	u32	encrypt_start_offset;
 	u32	encrypt_size;
 };
-#endif /* CONFIG_ARMADA_XXX */
+#elif defined(CONFIG_ARMADA_38X)	/* A38X */
+
+/* Structure of the main header, version 1 (Armada 370/38x/XP) */
+struct a38x_main_hdr_v1 {
+	u8  blockid;               /* 0x0       */
+	u8  flags;                 /* 0x1       */
+	u16 reserved2;             /* 0x2-0x3   */
+	u32 blocksize;             /* 0x4-0x7   */
+	u8  version;               /* 0x8       */
+	u8  headersz_msb;          /* 0x9       */
+	u16 headersz_lsb;          /* 0xA-0xB   */
+	u32 srcaddr;               /* 0xC-0xF   */
+	u32 destaddr;              /* 0x10-0x13 */
+	u32 execaddr;              /* 0x14-0x17 */
+	u8  options;               /* 0x18      */
+	u8  nandblocksize;         /* 0x19      */
+	u8  nandbadblklocation;    /* 0x1A      */
+	u8  reserved4;             /* 0x1B      */
+	u16 reserved5;             /* 0x1C-0x1D */
+	u8  ext;                   /* 0x1E      */
+	u8  checksum;              /* 0x1F      */
+};
+#endif
 
 struct bubt_dev {
 	char name[8];
@@ -621,7 +643,52 @@ static int check_image_header(void)
 
 	return 0;
 }
+#elif defined(CONFIG_ARMADA_38X)
+static size_t a38x_header_size(const struct a38x_main_hdr_v1 *h)
+{
+	if (h->version == 1)
+		return (h->headersz_msb << 16) | le16_to_cpu(h->headersz_lsb);
+
+	printf("Error: Invalid A38x image (header version 0x%x unknown)!\n",
+	       h->version);
+	return 0;
+}
+
+static uint8_t image_checksum8(const void *start, size_t len)
+{
+	u8 csum = 0;
+	const u8 *p = start;
+
+	while (len) {
+		csum += *p;
+		++p;
+		--len;
+	}
+
+	return csum;
+}
 
+static int check_image_header(void)
+{
+	u8 checksum;
+	const struct a38x_main_hdr_v1 *hdr =
+		(struct a38x_main_hdr_v1 *)get_load_addr();
+	const size_t image_size = a38x_header_size(hdr);
+
+	if (!image_size)
+		return -ENOEXEC;
+
+	checksum = image_checksum8(hdr, image_size);
+	checksum -= hdr->checksum;
+	if (checksum != hdr->checksum) {
+		printf("Error: Bad A38x image checksum. 0x%x != 0x%x\n",
+		       checksum, hdr->checksum);
+		return -ENOEXEC;
+	}
+
+	printf("Image checksum...OK!\n");
+	return 0;
+}
 #else /* Not ARMADA? */
 static int check_image_header(void)
 {
-- 
2.26.1