The UEFI specification requires at least 128 KiB stack space. Consider this value as a prerequisite for CONFIG_EFI_LOADER.
Mention the requirement in the CONFIG_STACK_SPACE description and decribe that the UEFI sub-system uses CONFIG_STACK_SPACE when defining the memory map. Signed-off-by: Heinrich Schuchardt <[email protected]> --- Kconfig | 8 +++++--- lib/efi_loader/Kconfig | 2 ++ 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/Kconfig b/Kconfig index ce25ea24a60..99b3cd62526 100644 --- a/Kconfig +++ b/Kconfig @@ -615,9 +615,11 @@ config STACK_SIZE default 0x4000 if ARCH_STM32 default 0x1000000 help - Define Max stack size that can be used by U-Boot. This value is used - by the UEFI sub-system. On some boards initrd_high is calculated as - base stack pointer minus this stack size. + Define Max stack size that can be used by U-Boot. The UEFI sub-system + considers this value when setting up the memory map. The UEFI + specification requires 128 KiB or more of available stack space. On + some boards initrd_high is calculated as base stack pointer minus this + stack size. config SYS_MEM_TOP_HIDE hex "Exclude some memory from U-Boot / OS information" diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig index 13e44be1d06..450ffa61c0a 100644 --- a/lib/efi_loader/Kconfig +++ b/lib/efi_loader/Kconfig @@ -15,6 +15,8 @@ config EFI_LOADER # We need EFI_STUB_32BIT to be set on x86_32 with EFI_STUB depends on !EFI_STUB || !X86 || X86_64 || EFI_STUB_32BIT depends on !EFI_APP + # The EFI specification requires 128 KiB or more of stack space + depends on STACK_SIZE >= 0x20000 default y if !ARM || SYS_CPU = armv7 || SYS_CPU = armv8 select EFI select CHARSET -- 2.51.0
