Hello Ilias, hello Christian,
with commit ec80b4735a59 ("efi_loader: Implement FileLoad2 for initramfs loading") Ilias provided the possibility to specify a device path (CONFIG_EFI_INITRD_FILESPEC) from which an initial RAM disk can be served via the EFI_FILE_LOAD2_PROTOCOL.
Ard extended the Linux EFI stub to allow loading the initial RAM disk via the EFI_FILE_LOAD2_PROTOCOL with the utmost priority.
With commit ecc7fdaa9ef1 ("bootm: Add a bootm command for type IH_OS_EFI") Cristian enabled signed FIT images that contain a device tree and a UEFI binary (enabled by CONFIG_BOOTM_EFI=y).
In the DTE calls we have discussed that it is unfortunate that we do not have a method to validate initial RAM images in the UEFI context.
To me it would look like a good path forward to combine the two ideas:
* Let the signed FIT image (of type IH_OS_EFI) contain a RAM disk * Pass location and size to the UEFI subsystem and serve them via the EFI_FILE_LOAD2_PROTOCOL.
We could also extend the bootefi command to be callable as
bootefi $kernel_addr_r $ramdisk_addr_r:$filesize $fdt_addr_r
like the booti command to serve an initial RAM disk.
What are your thoughts?
Best regards
Heinrich