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 <[email protected]> --- 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/[email protected]/ 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/[email protected]/ 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 -- 2.34.1
