drivers: fastboot: zImage flashing is not supported for v3, v4

With vendor boot image introduced in version 3 and 4 of boot
image header, boot information is located in both boot image
and vendor boot image.

Flashing zImage is not supported for version 3 and 4 since this
requires updating vendor boot image and/or generating a new image.

Print an error message when the boot image header version is
greater than 2.

Signed-off-by: Safae Ouajih <souajih@baylibre.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

diff --git a/drivers/fastboot/fb_mmc.c b/drivers/fastboot/fb_mmc.c
index 29c18cb82a44ff419ae0a794e3d9fe1e6a8d63ed..9d25c402028a6dba18cd3c44a3e1cacf22b18a30 100644 (file)
--- a/drivers/fastboot/fb_mmc.c
+++ b/drivers/fastboot/fb_mmc.c
@@ -370,6 +370,14 @@ static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
                return -1;
        }
 
+       /* Check if boot image header version is 2 or less */
+       if (hdr->header_version > 2) {
+               pr_err("zImage flashing supported only for boot images v2 and less\n");
+               fastboot_fail("zImage flashing supported only for boot images v2 and less",
+                             response);
+               return -EOPNOTSUPP;
+       }
+
        /* Check if boot image has second stage in it (we don't support it) */
        if (hdr->second_size > 0) {
                pr_err("moving second stage is not supported yet\n");