UEFI firmware unable to load initrd for Xavier AGX


I’m running with the latest experimental UEFI firmware for Xavier AGX board.

The problem I’m hitting is, no matter what UEFI bootloader (tried both grub and systemd-boot), they all failed to load the initramfs created by mkinitcpio from Arch.

At booting time, the following error message show up:
EFI stub: Booting Linux Kernel…
EFI stub: Using DTB from configuration table
EFI stub: ERROR: Failed to load initrd!
EFI stub: Exiting boot services and installing virtual address map…
[ 0.000000] Linux version 5.12.0-rc8-custom+ (adam@adam-pc) (aarch64-linux-gnu-gcc (GCC) 10.3.0, GNU ld (GNU Binutils) 2.36.1) #31 SMP PREEMPT Sun May 9 13:58:55 CST 2021

Without the ability to load an initramfs, I can still compile a bootable kernel, although tegra-xusb probe will timeout after 60s.

One thing to note, since my kernel is custom built, I use something like “Image-custom” for my kernel and “initramfs-custom.img” for my initrd.
While Manjaro ARM provides upstream kernel and its initramfs with filename like “Image-linux” and “initramfs-linux.img”, while the initramfs can be loaded without problem.
(Both initramfs are created by the same tool)

Is the UEFI doing extra check on the initramfs filename?
Rejecting a initramfs just depending on the filename seems overkilled to me.