Grub QEMU

[Tony Richardson]

I couldn't find the script Suraj was referring to but
here is a script that I used recently to create a Grub2 floppy
image on Linux. It uses the loopback device (I don't have a real
floppy drive).  It is based on a script I found somewhere else.
Sorry for the lack of comments, but maybe it will help?

One neat trick with Grub - I have the menu file on the floppy image
load a second grub menu file from a Qemu hard drive "partition".  (The
partition is really a directory on the host computer that I map
to a Qemu partition using the Qemu "-hdb fat:directory" option.)
I can then just drag-and-drop RTEMS executables to the same directory
containing the menu file.  A script rebuilds the menu to include whatever
files are in the directory.


==========================================================================
#! /bin/sh -x
#First build GRUB from source under Linux.  You may need to install
#the LSO compression library first.
#To install to the /home/xxx tree:
#./configure --prefix=/home/xxx
#After building grub you can build a boot floppy like this:

grub=/home/xxx
file=floppy.img
mnt=loop

grub-mkimage -d $grub/lib/grub/i386-pc -o core.img _chain ls pc multiboot \
              gpt fat boot reboot configfile cat help

dd if=/dev/zero of=$file bs=1k count=1440

/sbin/mkdosfs $file

mkdir -p $mnt

mount -o loop -t vfat $file $mnt

mkdir -p $mnt/boot/grub

cp $grub/lib/grub/i386-pc/boot.img core.img \
   $grub/lib/grub/i386-pc/*.mod $mnt/boot/grub

echo "configfile (hd0,1)/rtems-grub.cfg" > $mnt/boot/grub/grub.cfg

echo '(fd0)' $file > tmp_device.map

grub-setup -d $mnt/boot/grub -r '(fd0)' -m tmp_device.map '(fd0)'

rm -f tmp_device.map

umount $mnt

==========================================================================

Tony Richardson


> -----Original Message-----
> From: rtems-users-bounces at rtems.org 
> [mailto:rtems-users-bounces at rtems.org] On Behalf Of Joel Sherrill
> Sent: Friday, March 28, 2008 7:57 AM
> To: surajkamal at quarkcybernetics.com; RTEMSUsers
> Subject: Re: Grub QEMU
> 
> I don't think the script in the Wiki is from me. 
> Besides I failed last time I tried to make a new grub boot floppy. :(
> 
> Can someone give him a hand?
> 
> Thanks.
> 
> --joel
> 
> surajkamal at quarkcybernetics.com wrote:
> > Hello Joel,
> >
> >
> >             I am Suraj Kamal from Quark Cybernetics
> >             and am trying to do some projects with RTEMS.
> >             Also I am very new to RTEMS and Linux.
> >             I just manged to install RTEMS binaries and
> >             cross development tool set for PC386.
> >             And 'make' "Hello World" example with success.
> >             I have installed GRUB version 1.96.
> >             My host PC is running on Fedora core 8 on 
> x86_64 platform.
> >             I have tried shell script for making a floppy image
> >             provided by you, in the Wiki pages.
> >             But it kicked out some errors....
> > cp: cannot stat `/tmp/g2/build/lib/grub/i386-pc/boot.img': No such
> > file or direc                                            tory
> > cp: cannot stat `core.img': No such file or directory
> > cp: cannot stat `/tmp/g2/build/lib/grub/i386-pc/*.mod': No such file
> > or director                                            y
> >
> >            everything else are ok,
> >            I tried booting QEMU, but resulted in a screen
> >            Showing.. 
> >            "Booting from hard disk...."
> >            and no response after....
> >
> >
> >                       Could you please help me to get 
> around the problem?
> >
> >                                                    Regards,
> >                                                           
> Suraj Kamal
> >                                                           Quark 
> > Cybernetics
> >
> >
> >
> >   
> 
> 
> -- 
> Joel Sherrill, Ph.D.             Director of Research & Development
> joel.sherrill at OARcorp.com        On-Line Applications Research
> Ask me about RTEMS: a free RTOS  Huntsville AL 35805
>    Support Available             (256) 722-9985
> 
> 
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