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stm32mp: Reserve OPTEE area in EFI memory map

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Since commit 7b78d6438a ("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>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Patrice Chotard 2024-04-22 17:06:45 +02:00
parent f1de28e67a
commit 2ec88086c9
1 changed files with 12 additions and 0 deletions
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12
arch/arm/mach-stm32mp/dram_init.c
View file

@ -6,6 +6,7 @@
#define LOG_CATEGORY LOGC_ARCH
#include <dm.h>
#include <efi_loader.h>
#include <image.h>
#include <init.h>
#include <lmb.h>
@ -74,3 +75,14 @@ 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);
}