Turns out this is a GRUB issue. It was fixed upstream in the following
commit, which cleanly cherry-picks to groovy. I prepared a test build in
ppa:dannf/test and confirmed it resolves the issue.
commit a6838bbc6726ad624bd2b94991f690b8e9d23c69
Author: Javier Martinez Canillas <javi...@redhat.com>
Date: Thu Sep 10 17:17:57 2020 +0200
tftp: Roll-over block counter to prevent data packets timeouts
Commit 781b3e5efc3 (tftp: Do not use priority queue) caused a regression
when fetching files over TFTP whose size is bigger than 65535 * block size.
grub> linux /images/pxeboot/vmlinuz
grub> echo $?
0
grub> initrd /images/pxeboot/initrd.img
error: timeout reading '/images/pxeboot/initrd.img'.
grub> echo $?
28
** Changed in: livecd-rootfs (Ubuntu)
Status: New => Invalid
** Changed in: grub2 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1900773
Title:
ARM servers timeout downloading initrd
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