[PATCH] board: freescale: imx93_evk: Fix MMC environment offset boot conflict.

[Peng Fan]

On 4/12/2023 4:40 AM, Ken Sloat wrote:
>  From 734bfa4e4556976fe85c741f13ae94161cae97e6 Mon Sep 17 00:00:00 2001
> From: Ken Sloat <ken.s at variscite.com>
> Date: Tue, 11 Apr 2023 16:05:31 -0400
> 
> Currently, the imx93_evk is configured with CONFIG_ENV_IS_IN_MMC and the
> chosen environment offset in the config is 0x400000. Unless the user
> programs the associated fuses, this offset is the default secondary boot
> image offset used by the i.MX 93 ROM bootloader. With certain
> combinations of environmental variables, the CRC and beginning of the
> environment can potentially falsely appear as a valid boot image
> container header. If the expected "sw_version" offset within this
> mistaken boot image container is greater than the primary's, the ROM
> bootloader can skip booting of the primary image altogether and attempt
> to boot with the content of the environment data. This will then hang
> the system.
> 
> To fix this, move the environment from 0x400000 to 0x700000 reserving up
> to 3 MB at 0x400000 for any actual secondary user image container.
> 
> Signed-off-by: Ken Sloat <ken.s at variscite.com>

Reviewed-by: Peng Fan <peng.fan at nxp.com>

> ---
>   configs/imx93_11x11_evk_defconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/configs/imx93_11x11_evk_defconfig b/configs/imx93_11x11_evk_defconfig
> index 4f8777161e..db94bbfdd1 100644
> --- a/configs/imx93_11x11_evk_defconfig
> +++ b/configs/imx93_11x11_evk_defconfig
> @@ -7,7 +7,7 @@ CONFIG_SPL_LIBCOMMON_SUPPORT=y
>   CONFIG_SPL_LIBGENERIC_SUPPORT=y
>   CONFIG_NR_DRAM_BANKS=2
>   CONFIG_ENV_SIZE=0x4000
> -CONFIG_ENV_OFFSET=0x400000
> +CONFIG_ENV_OFFSET=0x700000
>   CONFIG_DM_GPIO=y
>   CONFIG_DEFAULT_DEVICE_TREE="imx93-11x11-evk"
>   CONFIG_SPL_TEXT_BASE=0x2049A000