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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 table. The Linux kernel EFI stub uses the load options as command line
arguments. 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 Executing the boot manager
~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~