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x86: doc: Update EFI loader support

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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>
This commit is contained in:
Bin Meng 2018-06-27 20:38:05 -07:00
parent 47cae019ef
commit 73149164f4
1 changed files with 27 additions and 2 deletions
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29
doc/README.x86
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@ -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.