[PATCH v3] configs: am57xx_hs_evm_defconfig: Reserve EMIF memory used by PPA

[Andrew Davis]

On 12/28/25 11:11 PM, Beleswar Padhi wrote:
> The AM571x SoC has 1 GB DDR space. As part of normal re-location process
> U-Boot copies itself to the top of DDR bank. However, on HS devices, the
> top 37 MB is used by PPA and is firewalled. This results in an exception
> and the boot fails. Set CONFIG_SYS_MEM_TOP_HIDE to reserve the top 38 MB
> memory (aligned to 2MB as per page size for ARM32) to fix the boot.
> 
> Note: This limitation does not exist for other AM57x devices, but this
> config is applied in the common defconfig since adding a separate
> defconfig only for AM571x is not justified. Losing 38MB of memory at the
> bootloader stage on other devices is acceptable.
> 
> Signed-off-by: Beleswar Padhi <b-padhi at ti.com>
> ---

Reviewed-by: Andrew Davis <afd at ti.com>

> Fix boot for TI AM571x HS EVM board
> 
> v3: Changelog:
> 1. Carry the changes in the common am57xx_hs_evm_defconfig file
> 
> Link to v2:
> https://lore.kernel.org/all/20251128150455.3279166-1-b-padhi@ti.com/
> 
> v2: Changelog:
> 1. Drop [PATCH v1 2/2] in v2 series. There is no need to add reserved
> memory node in DT as it is done by U-Boot as part of FDT fixups
> https://github.com/u-boot/u-boot/blob/master/arch/arm/mach-omap2/fdt-common.c#L72-L107
> 2. Add entry in MAINTAINERS for new config.
> 3. Update commit message to use memory size in MB than raw hex bytes
> 
> Link to v1:
> https://lore.kernel.org/all/20251128064353.1295063-1-b-padhi@ti.com/
> 
> Test logs:
> https://gist.github.com/3V3RYONE/e86b3f4551986b0400d0e0f66d6ecc66
> 
>   configs/am57xx_hs_evm_defconfig | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/configs/am57xx_hs_evm_defconfig b/configs/am57xx_hs_evm_defconfig
> index 6e4704470e8..3db30d2397e 100644
> --- a/configs/am57xx_hs_evm_defconfig
> +++ b/configs/am57xx_hs_evm_defconfig
> @@ -16,6 +16,7 @@ CONFIG_SPL=y
>   CONFIG_SPL_SPI_FLASH_SUPPORT=y
>   CONFIG_SPL_SPI=y
>   CONFIG_ARMV7_LPAE=y
> +CONFIG_SYS_MEM_TOP_HIDE=0x2600000
>   CONFIG_AHCI=y
>   CONFIG_SPL_LOAD_FIT=y
>   CONFIG_DISTRO_DEFAULTS=y