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efi_loader: make variable store size customizable

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Currently the size of the buffer to keep UEFI variables in memory is fixed
at 16384 bytes. This size has proven to be too small for some use cases.

Make the size of the memory buffer for UEFI variables customizable.

Reported-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Heinrich Schuchardt 2020-12-20 11:05:38 +01:00
parent 0c1b71cd07
commit 265ce19485
2 changed files with 15 additions and 1 deletions
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2
include/efi_variable.h
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@ -91,7 +91,7 @@ efi_status_t efi_query_variable_info_int(u32 attributes,
#define EFI_VAR_FILE_NAME "ubootefi.var"
#define EFI_VAR_BUF_SIZE 0x4000
#define EFI_VAR_BUF_SIZE CONFIG_EFI_VAR_BUF_SIZE
/*
* This constant identifies the file format for storing UEFI variables in

14
lib/efi_loader/Kconfig
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@ -77,6 +77,20 @@ config EFI_VAR_SEED_FILE
endif
config EFI_VAR_BUF_SIZE
int "Memory size of the UEFI variable store"
default 16384
range 4096 2147483647
help
This defines the size in bytes of the memory area reserved for keeping
UEFI variables.
When using StandAloneMM (CONFIG_EFI_MM_COMM_TEE=y) this value should
match the value of PcdFlashNvStorageVariableSize used to compile the
StandAloneMM module.
Minimum 4096, default 16384.
config EFI_GET_TIME
bool "GetTime() runtime service"
depends on DM_RTC