[PATCH v2 5/6] common: android_ab: fix slot suffix for abc block

[Dmitry Rokosov]

Hello Simon and Mattijs!

In the v1 patch series, you suggested creating a test case for the
changes in this patchset. However, the bcb ab_dump test in the current
patch series already covers all code paths involving slot_suffix
generation. Therefore, an additional test case for that is not
necessary.

On Thu, Sep 12, 2024 at 12:49:13AM +0300, Dmitry Rokosov wrote:
> To align with the official Android BCB (Bootloader Control Block)
> specifications, it's important to note that the slot_suffix should start
> with an underscore symbol.
> 
> For a comprehensive understanding of the expected slot_suffix format in
> userspace, please refer to the provided reference [1].
> 
> Links:
> [1] - https://source.android.com/docs/core/architecture/bootloader/updating#slots
> 
> Based-on: https://android-review.googlesource.com/c/platform/external/u-boot/+/1446439
> Signed-off-by: Dmitry Rokosov <ddrokosov at salutedevices.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
> ---
>  boot/android_ab.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/boot/android_ab.c b/boot/android_ab.c
> index c93e51541019..a287eac04fe8 100644
> --- a/boot/android_ab.c
> +++ b/boot/android_ab.c
> @@ -52,7 +52,7 @@ static int ab_control_default(struct bootloader_control *abc)
>  	if (!abc)
>  		return -EFAULT;
>  
> -	memcpy(abc->slot_suffix, "a\0\0\0", 4);
> +	memcpy(abc->slot_suffix, "_a\0\0", 4);
>  	abc->magic = BOOT_CTRL_MAGIC;
>  	abc->version = BOOT_CTRL_VERSION;
>  	abc->nb_slot = NUM_SLOTS;
> @@ -328,7 +328,8 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info,
>  		 * or the device tree.
>  		 */
>  		memset(slot_suffix, 0, sizeof(slot_suffix));
> -		slot_suffix[0] = BOOT_SLOT_NAME(slot);
> +		slot_suffix[0] = '_';
> +		slot_suffix[1] = BOOT_SLOT_NAME(slot);
>  		if (memcmp(abc->slot_suffix, slot_suffix,
>  			   sizeof(slot_suffix))) {
>  			memcpy(abc->slot_suffix, slot_suffix,
> -- 
> 2.43.0
> 

-- 
Thank you,
Dmitry