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doc: uefi.rst: Document launching UEFI binaries from FIT images

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This patch adds a new section "Launching a UEFI binary from a FIT image"
documenting the usage of the CONFIG_BOOTM_EFI extension to bootm command
that offers a verified boot alternative for UEFI binaries such as GRUB2.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Cristian Ciocaltea 2019-12-24 18:05:41 +02:00 committed by Heinrich Schuchardt
parent b533386dc1
commit 2dbab878ba
1 changed files with 34 additions and 0 deletions
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doc/uefi/uefi.rst
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@ -63,6 +63,40 @@ The environment variable 'bootargs' is passed as load options in the UEFI system
table. The Linux kernel EFI stub uses the load options as command line
arguments.
Launching a UEFI binary from a FIT image
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A signed FIT image can be used to securely boot a UEFI image via the
bootm command. This feature is available if U-Boot is configured with::
CONFIG_BOOTM_EFI=y
A sample configuration is provided as file doc/uImage.FIT/uefi.its.
Below you find the output of an example session starting GRUB::
=> load mmc 0:1 ${kernel_addr_r} image.fit
4620426 bytes read in 83 ms (53.1 MiB/s)
=> bootm ${kernel_addr_r}#config-grub-nofdt
## Loading kernel from FIT Image at 40400000 ...
Using 'config-grub-nofdt' configuration
Verifying Hash Integrity ... sha256,rsa2048:dev+ OK
Trying 'efi-grub' kernel subimage
Description: GRUB EFI Firmware
Created: 2019-11-20 8:18:16 UTC
Type: Kernel Image (no loading done)
Compression: uncompressed
Data Start: 0x404000d0
Data Size: 450560 Bytes = 440 KiB
Hash algo: sha256
Hash value: 4dbee00021112df618f58b3f7cf5e1595533d543094064b9ce991e8b054a9eec
Verifying Hash Integrity ... sha256+ OK
XIP Kernel Image (no loading done)
## Transferring control to EFI (at address 404000d0) ...
Welcome to GRUB!
See doc/uImage.FIT/howto.txt for an introduction to FIT images.
Executing the boot manager
~~~~~~~~~~~~~~~~~~~~~~~~~~