Hi,
On 4/22/24 17:06, Patrice Chotard wrote:
Since commit 7b78d6438a2b3 ("efi_loader: Reserve unaccessible memory") memory region above ram_top is tagged in EFI memory map as EFI_BOOT_SERVICES_DATA. In case of STM32MP1/STM32MP13 platforms, above ram_top, there is one reserved-memory region tagged "no-map" dedicated to OP-TEE : _ addr=de000000 size=2000000 for stm32mp157x-dkx and stm32mp135f-dk _ addr=fe000000 size=2000000 for stm32mp157c-ev1
Before booting kernel, EFI memory map is first built, the OPTEE region is tagged as EFI_BOOT_SERVICES_DATA and when reserving LMB, the tag LMB_NONE is used.
Then after, the LMB are completed by boot_fdt_add_mem_rsv_regions() which try to add again the same OPTEE region (addr=de000000 size=2000000 in case of stm32mp157x-dkx / stm32mp135f-dk or addr=fe000000 size=2000000 in case for stm2mp157c-ev1) but now with LMB_NOMAP tag which produces the following error message :
_ for stm32mp157x-dkx / stm32mp135f-dk : "ERROR: reserving fdt memory region failed (addr=de000000 size=2000000 flags=4)"
_ for stm32mp157c-ev1 : "ERROR: reserving fdt memory region failed (addr=fe000000 size=2000000 flags=4)"
To avoid this, OPTEE area shouldn't be used by EFI, so we need to mark it as reserved.
Signed-off-by: Patrice Chotard patrice.chotard@foss.st.com
Changes in v2: _ update commit message by adding information about memory area dedicated for OPTEE for various STM32MP1/STM32MP13 boards.
arch/arm/mach-stm32mp/dram_init.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm/mach-stm32mp/dram_init.c b/arch/arm/mach-stm32mp/dram_init.c index fb1208fc5d5..f67f54f2ae0 100644 --- a/arch/arm/mach-stm32mp/dram_init.c +++ b/arch/arm/mach-stm32mp/dram_init.c @@ -7,6 +7,7 @@
#include <common.h> #include <dm.h> +#include <efi_loader.h> #include <image.h> #include <init.h> #include <lmb.h> @@ -75,3 +76,14 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
return reg + size; }
+void efi_add_known_memory(void) +{
- if (IS_ENABLED(CONFIG_EFI_LOADER))
/** Memory over ram_top is reserved to OPTEE.* 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);+}
It seen like a temporary workaround after commit 7b78d6438a2b3 ("efi_loader: Reserve unaccessible memory") to avoid warnings.
And it is working because in the default memory mapping OP-TEE base address == RAM_TOP and the rest of memory is used by OP-TEE tagged "no map" (protected by firewall)
Reviewed-by: Patrick Delaunay patrick.delaunay@foss.st.com
FYI: workaround because the memory above ram_top is "already occupied by firmware" = and it is OP-TEE for STM32MP2 platform.
For me the LMB type used by EFI in not correct for OP-TEE usage region with "no-map" tag in device tree= see boot_fdt_add_mem_rsv_regions() for linux DT parsing
and we have no way to indicated this LMB tag= LMB_NOMAP with EFI stack (with enum efi_memory_type ?)
EFI_BOOT_SERVICES_DATA => doesn't means NOMAP flag for LMB.... so something is missing in EFI side like EFI_BOOT_NOMAP to be used in board implementation of efi_add_known_memory() ?
Thanks Patrick