doc: uefi.rst: Document launching UEFI binaries from FIT images
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:
parent
b533386dc1
commit
2dbab878ba
1 changed files with 34 additions and 0 deletions
|
@ -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
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
|
|
Loading…
Reference in a new issue