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efi_loader: require at least 128 KiB of stack space

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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.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt
2026-02-17 08:46:55 +01:00
parent fab3b667b4
commit ca495f011f
2 changed files with 7 additions and 3 deletions
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8
Kconfig
View File

@@ -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"

2
lib/efi_loader/Kconfig
View File

@@ -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