efi_loader: Replace config option for initrd loading
Up to now we install EFI_LOAD_FILE2_PROTOCOL to load an initrd
unconditionally. Although we correctly return various EFI exit codes
depending on the file status (i.e EFI_NO_MEDIA, EFI_NOT_FOUND etc), the
kernel loader, only falls back to the cmdline interpreted initrd if the
protocol is not installed.
This creates a problem for EFI installers, since they won't be able to
load their own initrd and continue the installation. It also makes the
feature hard to use, since we can either have a single initrd or we have
to recompile u-boot if the filename changes.
So let's introduce a different logic that will decouple the initrd
path from the config option we currently have.
When defining a UEFI BootXXXX we can use the filepathlist and store
a file path pointing to our initrd. Specifically the EFI spec describes:
"The first element of the array is a device path that describes the device
and location of the Image for this load option. Other device paths may
optionally exist in the FilePathList, but their usage is OSV specific"
When the EFI application is launched through the bootmgr, we'll try to
interpret the extra device path. If that points to a file that exists on
our disk, we'll now install the load_file2 and the efi-stub will be able
to use it.
This opens up another path using U-Boot and defines a new boot flow.
A user will be able to control the kernel/initrd pairs without explicit
cmdline args or GRUB.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 634d3b1..0a41244 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -315,18 +315,13 @@
config EFI_LOAD_FILE2_INITRD
bool "EFI_FILE_LOAD2_PROTOCOL for Linux initial ramdisk"
- default n
- help
- Expose a EFI_FILE_LOAD2_PROTOCOL that the Linux UEFI stub can
- use to load the initial ramdisk. Once this is enabled using
- initrd=<ramdisk> will stop working.
-
-config EFI_INITRD_FILESPEC
- string "initramfs path"
- default "host 0:1 initrd"
- depends on EFI_LOAD_FILE2_INITRD
+ default y
help
- Full path of the initramfs file, e.g. mmc 0:2 initramfs.cpio.gz.
+ Linux v5.7 and later can make use of this option. If the boot option
+ selected by the UEFI boot manager specifies an existing file to be used
+ as initial RAM disk, a Linux specific Load File2 protocol will be
+ installed and Linux 5.7+ will ignore any initrd=<ramdisk> command line
+ argument.
config EFI_SECURE_BOOT
bool "Enable EFI secure boot support"