mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-27 15:10:26 +09:00
doc: Update uefi documentation for initrd loading options
Document the command line options for efidebug and initrd loading Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Rewiewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
parent
a1e95e3805
commit
cd64031c16
@ -180,6 +180,12 @@ Set up boot parameters on your board::
|
||||
|
||||
efidebug boot add -b 1 HELLO mmc 0:1 /helloworld.efi.signed ""
|
||||
|
||||
Since kernel 5.7 there's an alternative way of loading an initrd using
|
||||
LoadFile2 protocol if CONFIG_EFI_LOAD_FILE2_INITRD is enabled.
|
||||
The initrd path can be specified with::
|
||||
|
||||
efidebug boot add -b ABE0 'kernel' mmc 0:1 Image -i mmc 0:1 initrd
|
||||
|
||||
Now your board can run the signed image via the boot manager (see below).
|
||||
You can also try this sequence by running Pytest, test_efi_secboot,
|
||||
on the sandbox
|
||||
@ -484,7 +490,21 @@ The load file 2 protocol can be used by the Linux kernel to load the initial
|
||||
RAM disk. U-Boot can be configured to provide an implementation with::
|
||||
|
||||
EFI_LOAD_FILE2_INITRD=y
|
||||
EFI_INITRD_FILESPEC=interface dev:part path_to_initrd
|
||||
|
||||
When the option is enabled the user can add the initrd path with the efidebug
|
||||
command.
|
||||
|
||||
Load options Boot#### have a FilePathList[] member. The first element of
|
||||
the array (FilePathList[0]) is the EFI binary to execute. When an initrd
|
||||
is specified the Device Path for the initrd is denoted by a VenMedia node
|
||||
with the EFI_INITRD_MEDIA_GUID. Each entry of the array is terminated by the
|
||||
'end of entire device path' subtype (0xff). If a user wants to define multiple
|
||||
initrds, those must by separated by the 'end of this instance' identifier of
|
||||
the end node (0x01).
|
||||
|
||||
So our final format of the FilePathList[] is::
|
||||
|
||||
Loaded image - end node (0xff) - VenMedia - initrd_1 - [end node (0x01) - initrd_n ...] - end node (0xff)
|
||||
|
||||
Links
|
||||
-----
|
||||
|
Loading…
Reference in New Issue
Block a user