Importance of Bochs (and PearPC)

[Joel Sherrill <joel@OARcorp.com>]

Chris Johns wrote:
> Joel Sherrill <joel at OARcorp.com> wrote:
> 
>>
>> +  If you have knowledge of the ATA subsystem,
>>    please give Bochs a try for the File IO test and
>>    post the complete setup.
>>
> 
> I see on the wiki page you want to know how to create a disk image and 
> then format it. On Linux I use the loopback device (man losetup) and 
> mkdosfs to create a disk image. Does the attached script help ?

I now have a loopback image formatted but don't know enough about
how it was formatted to write the corresponding Bochs configuration
file entry.  Do you know enough to answer the ata* configuration
parameters?

http://bochs.sourceforge.net/cgi-bin/topper.pl?name=New+Bochs+Documentation&url=http://bochs.sourceforge.net/doc/docbook/user/book1.html

It looks like we have to know the mode (flat?), sector size,
and some math about heads, cylinders, and "spts".  What would those be?

Sorry to be so dense.

--joel

> ------------------------------------------------------------------------
> 
> #!/bin/bash
> #
> # Make the disk.
> #
> # Chris Johns (chrisj at rtems dot org)
> #
> #
> 
> if [ $# -ne 2 ]; then
>   echo "Need to supply the image name and image size in megs."
>   exit 1
> fi
> 
> PATH=/sbin:/usr/sbin:$PATH
> 
> DATE=`date +%Y%m%d`
> 
> MNTPOINT=mnt-image
> IMAGESIZE_IN_MEGS=$2
> IMAGESIZE=`expr $IMAGESIZE_IN_MEGS \* 1024`
> IMAGE=$1-$DATE.img
> 
> rm -f $IMAGE
> rm -f $IMAGE.gz
> 
> dd if=/dev/zero of=$IMAGE bs=1k count=$IMAGESIZE
> 
> for devnum in 0 1 2 3 4 5 6 7 8; do
>     if losetup /dev/loop$devnum $IMAGE 2>/dev/null ; then break; fi
> done
> 
> if [ "$devnum" = "8" ]; then
>   rm -rf $MNTPOINT $IMAGE
>   echo "All of your loopback devices are in use!" >&2
>   exit 1
> fi
> 
> LODEV=/dev/loop$devnum
> 
> # We have to "echo y |" so that it doesn't complain about $IMAGE not
> # being a block device
> echo y | mkdosfs $LODEV $IMAGESIZE >/dev/null 2>/dev/null
> 
> echo "Using loopback device $LODEV"
> 
> mkdir -p $MNTPOINT
> mount -t vfat $LODEV $MNTPOINT || {
>   echo "Can't get a loopback device"
>   exit 1
> }
> 
> here=$(pwd)
> 
> cd $MNTPOINT
> 
> #
> # Add files for the image here.
> #
> 
> cd $here
> umount $MNTPOINT
> losetup -d $LODEV
> 


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
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