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efi: Drop EFI_GRUB_ARM32_WORKAROUND

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This work-around dates from 2019 and grub 2.04 which is quite old. New
builds of grub don't have the problem and old boards presumably use an
older U-Boot, so don't need this.

Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-07-12 13:47:15 +02:00
parent a1ae8de12c
commit 898b951842
3 changed files with 0 additions and 37 deletions
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1
configs/mt7623n_bpir2_defconfig
View File

@@ -13,7 +13,6 @@ CONFIG_DEFAULT_DEVICE_TREE="mt7623n-bananapi-bpi-r2"
CONFIG_TARGET_MT7623=y
CONFIG_SYS_BOOTM_LEN=0x4000000
CONFIG_SYS_LOAD_ADDR=0x84000000
# CONFIG_EFI_GRUB_ARM32_WORKAROUND is not set
CONFIG_FIT=y
CONFIG_FIT_VERBOSE=y
CONFIG_DISTRO_DEFAULTS=y

10
lib/efi_loader/Kconfig
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@@ -498,16 +498,6 @@ config EFI_LOADER_BOUNCE_BUFFER
hardware we can create a bounce buffer so that payloads don't have to
worry about platform details.
config EFI_GRUB_ARM32_WORKAROUND
bool "Workaround for GRUB on 32bit ARM"
default n if ARCH_BCM283X || ARCH_SUNXI || ARCH_QEMU_ARM
default y
depends on ARM && !ARM64
help
GRUB prior to version 2.04 requires U-Boot to disable caches. This
workaround currently is also needed on systems with caches that
cannot be managed via CP15.
config EFI_ESRT
bool "Enable the UEFI ESRT generation"
depends on EFI_CAPSULE_FIRMWARE_MANAGEMENT

26
lib/efi_loader/efi_boottime.c
View File

@@ -2154,29 +2154,6 @@ error:
return EFI_EXIT(ret);
}
/**
* efi_exit_caches() - fix up caches for EFI payloads if necessary
*/
static void efi_exit_caches(void)
{
#if defined(CONFIG_EFI_GRUB_ARM32_WORKAROUND)
/*
* Boooting Linux via GRUB prior to version 2.04 fails on 32bit ARM if
* caches are enabled.
*
* TODO:
* According to the UEFI spec caches that can be managed via CP15
* operations should be enabled. Caches requiring platform information
* to manage should be disabled. This should not happen in
* ExitBootServices() but before invoking any UEFI binary is invoked.
*
* We want to keep the current workaround while GRUB prior to version
* 2.04 is still in use.
*/
cleanup_before_linux();
#endif
}
/**
* efi_exit_boot_services() - stop all boot services
* @image_handle: handle of the loaded image
@@ -2260,9 +2237,6 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
/* Patch out unsupported runtime function */
efi_runtime_detach();
/* Fix up caches for EFI payloads if necessary */
efi_exit_caches();
/* Disable boot time services */
systab.con_in_handle = NULL;
systab.con_in = NULL;