[PATCH 1/1] efi_loader: make memory store size customizable

[Ilias Apalodimas]

On Sun, Dec 20, 2020 at 11:17:02AM +0100, Heinrich Schuchardt wrote:
> 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 at cjr.nz>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> ---
>  include/efi_variable.h | 2 +-
>  lib/efi_loader/Kconfig | 8 ++++++++
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/include/efi_variable.h b/include/efi_variable.h
> index 4704a3c16e..bf5076233e 100644
> --- a/include/efi_variable.h
> +++ b/include/efi_variable.h
> @@ -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
> diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> index 7fd3a3c90c..deb86a335a 100644
> --- a/lib/efi_loader/Kconfig
> +++ b/lib/efi_loader/Kconfig
> @@ -77,6 +77,14 @@ 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 memory area reserved for keeping UEFI variables.
> +	  Minimum value 4096.
> +
>  config EFI_GET_TIME
>  	bool "GetTime() runtime service"
>  	depends on DM_RTC
> --
> 2.29.2
> 
That being said the RPMB variant also uses 0x4000, but that's not configurable
by U-Boot. It's a compilation option for StandAloneMM

Acked-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>