CONFIG_EFI_LOADER is fully supported on x86 now.
Signed-off-by: Bin Meng bmeng.cn@gmail.com Reviewed-by: Simon Glass sjg@chromium.org Reviewed-by: Alexander Graf agraf@suse.de ---
Changes in v2: None
doc/README.x86 | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-)
diff --git a/doc/README.x86 b/doc/README.x86 index 9f657df..9162ea1 100644 --- a/doc/README.x86 +++ b/doc/README.x86 @@ -1136,9 +1136,34 @@ EFI Support U-Boot supports booting as a 32-bit or 64-bit EFI payload, e.g. with UEFI. This is enabled with CONFIG_EFI_STUB to boot from both 32-bit and 64-bit UEFI BIOS. U-Boot can also run as an EFI application, with CONFIG_EFI_APP. -The CONFIG_EFI_LOADER option, where U-Booot provides an EFI environment to +The CONFIG_EFI_LOADER option, where U-Boot provides an EFI environment to the kernel (i.e. replaces UEFI completely but provides the same EFI run-time -services) is not currently supported on x86. +services) is supported too. For example, we can even use 'bootefi' command +to load a 'u-boot-payload.efi', see below test logs on QEMU. + + => load ide 0 3000000 u-boot-payload.efi + 489787 bytes read in 138 ms (3.4 MiB/s) + => bootefi 3000000 + Scanning disk ide.blk#0... + Found 2 disks + WARNING: booting without device tree + ## Starting EFI application at 03000000 ... + U-Boot EFI Payload + + + U-Boot 2018.07-rc2 (Jun 23 2018 - 17:12:58 +0800) + + CPU: x86_64, vendor AMD, device 663h + DRAM: 2 GiB + MMC: + Video: 1024x768x32 + Model: EFI x86 Payload + Net: e1000: 52:54:00:12:34:56 + + Warning: e1000#0 using MAC address from ROM + eth0: e1000#0 + No controllers found + Hit any key to stop autoboot: 0
See README.u-boot_on_efi and README.uefi for details of EFI support in U-Boot.