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Re: Loading modules with an embedded config file seems to fail

From: Andrei Borzenkov
Subject: Re: Loading modules with an embedded config file seems to fail
Date: Thu, 8 Oct 2015 20:50:15 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

08.10.2015 20:28, Colin Close пишет:
Thanks for your prompt reply, is this likely to change or is it dictated by 
thge 32k size limit?

Code that goes into core.img should be kept as small as possible. In your case using grub-mkrescue and placing grub.cfg there would be easier.

Colin Close

On Thursday 08 Oct 2015 17:15:27 Andrei Borzenkov wrote:
On Thu, Oct 8, 2015 at 4:55 PM, Colin Close <address@hidden> wrote:
I have created an embedded image like this:-
chroot "$CHROOTNAME" /usr/bin/grub2-mkimage -d "$GRUB_LIB" -O i386-pc -o 
"$GRUB_IMG" -p /boot/grub \-c /ISO/boot/grub/start_cfg  iso9660 biosdisk test
cat "$CHROOTNAME"/"$GRUB_LIB"/cdboot.img "$CHROOTNAME"/"$GRUB_IMG" > 

and used the following options with xorriso to build an iso image

XORRISO_OPTIONS1=" -b boot/grub/grub2-eltorito.img -no-emul-boot -boot-info-table 
--embedded-boot $ISOROOTNAME/boot/grub/grub2-embed_img --protective-msdos-label"

The embedded image contain this start_cfg file

if [ "${grub_platform}" == "efi" ]; then

This is defined by normal.mod which is not loaded at this point.

search --no-floppy --set=root --fs-uuid '%GRUB_UUID%'
set prefix=($root)/boot/grub
set efi=1
source ($root)/boot/grub/grub.cfg

That won't work using your command line anyway - you include neither search command not normal.mod.

insmod part_apple
insmod part_bsd
insmod part_gpt
insmod part_msdos

grub-mkrescue does it for you and is guaranteed to continue to work if these modules change.

set bios=1
set efi=0
source ($root)/boot/grub/grub.cfg

When I boot the iso in BIOS mode I get the following errors reported
Unknown command ` if '
Unknown command ` search '
Unknown command ` source '
Unknown command ` fi '
Unknown command ` source '

Embedded config is processed using rescue parser which does not
understand compound statements. This has been discussed just recently
on help-grub. The guy intended to open bug report for misleading
documentation but apparently never came around to do it.

Can anyone help me with this I have tried every possible strategy and nothing 
seems to work. Currently the config file is set up so it falls through to the 
bios boot and the flags get set right and things do work but obviously this is 
not ideal.
Colin Close

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