From: Vitor Soares vitor.soares@toradex.com
During the boot, the EFI loader maps the memory from ram_top to ram_end as EFI_BOOT_SERVICES_DATA. When LMB does boot_fdt_add_mem_rsv_regions() to OPTEE, TFA, R5, and M4F DMA/memory "no-map" for the kernel it produces the following error message:
ERROR: reserving fdt memory region failed (addr=9cb00000 size=100000 flags=4) ERROR: reserving fdt memory region failed (addr=9cc00000 size=e00000 flags=4) ERROR: reserving fdt memory region failed (addr=9da00000 size=100000 flags=4) ERROR: reserving fdt memory region failed (addr=9db00000 size=c00000 flags=4) ERROR: reserving fdt memory region failed (addr=9e780000 size=80000 flags=4) ERROR: reserving fdt memory region failed (addr=9e800000 size=1800000 flags=4)
To avoid this, don't flag with EFI_BOOT_SERVICES_DATA the memory from ram_top to ram_end by the EFI loader.
Signed-off-by: Vitor Soares vitor.soares@toradex.com ---
Similar fix for the same issue can be found at https://lore.kernel.org/all/20240308101230.2595220-1-patrice.chotard@foss.st...
arch/arm/mach-k3/common.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c index b54f2ddc47..80e89b2a16 100644 --- a/arch/arm/mach-k3/common.c +++ b/arch/arm/mach-k3/common.c @@ -24,6 +24,7 @@ #include <asm/io.h> #include <fs_loader.h> #include <fs.h> +#include <efi_loader.h> #include <env.h> #include <elf.h> #include <soc.h> @@ -607,3 +608,14 @@ void setup_qos(void) writel(qos_data[i].val, (uintptr_t)qos_data[i].reg); } #endif + +void efi_add_known_memory(void) +{ + if (IS_ENABLED(CONFIG_EFI_LOADER)) + /* + * Memory over ram_top can be used by various firmware + * Declare to EFI only memory area below ram_top + */ + efi_add_memory_map(gd->ram_base, gd->ram_top - gd->ram_base, + EFI_CONVENTIONAL_MEMORY); +}