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Possible bug in powerpc-ieee1275 ofnet

From: David Huffman
Subject: Possible bug in powerpc-ieee1275 ofnet
Date: Tue, 26 Jan 2021 12:17:41 -0800

When network booting using a boot server without a chroot jail, I need the 
$prefix variable to be set to the full path of the tftp directory. I create the 
core boot file with the following flags.

grub-mkimage -o /tmp/netboot.elf -O powerpc-ieee1275 -p "" -d 
/usr/local/lib/grub/powerpc-ieee1275 tftp net ofnet configfile echo linux 
normal search

I am using grub-2.04 compiled from source.

I leave the prefix (-p) empty so that when booted, prefix will get set to the 
same as $cmdpath. In the case of i386-pc-pxe and x86_64-efi, the $prefix 
variable is set to the tftp boot path. However, on powerpc-ieee1275 the prefix 
is only set to the tftp and server.

From the grub shell I check the value of $prefix.

echo $prefix

echo $prefix

echo $prefix

The dhcpd.conf and tftp configuration is exactly the same in this test. If my 
tftp server is in a chroot jail, this is a non-issue. However, I plan to 
netboot systems from non-linux boot servers where I will NOT be in a chroot 
jail. I know I could hardcode the prefix using the -p flag, but the tftp boot 
path is not known at the time the core image is created.

Is this a bug or expected behavior?

Thank you,

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