Hi Alain, Bernd, Eric:
I followed the instructions below from Alain, using my Fedora 14 (Linux)
box. I didn't have 100% success but I am much closer! I created an image
file in the manner described below. I wondered where to find command.com
and kernel.sys...so I downloaded the FreeDOS iso for 1.1 and found those
files in the "one disk" folder. I copied them to my image and then
copied over my BIOS update files which are packaged in a directory.
However I ran into trouble at Step 8: specifically, I couldn't figure
out how to independently generate an "isolinux" folder or where to find
isolinux to start with. So I copied over the "ISOLINUX" folder I found
inside the FreeDOS 1.1 iso, and did some experimenting with the
arguments to mkisofs. This got me a nice small iso image which I burned
to CD.
I then booted from this cd and got...the FreeDOS 1.1 installation screen
in all its glory!
In Alain's recipe below, it is not obvious to me how the FreeDOS.img
file is connected to isolinux. I played with the tab key to see the boot
arguments for the CD I made, and I get the impression that FreeDOS.img
would be treated as the initrd= argument to isolinux. Am I right about
that? In other words, isolinux takes the FreeDOS.img file, loads it into
memory, and then passes control to it?
Clearly, I need to read up more about using isolinux. I am very grateful
to all of you for your help and advice. I'm making progress!
Bob
On 1/17/12 2:27 PM, Alain Mouette wrote:
I have done this some time ago, it may help. It is for CD, but it would
be nice to convert it to SD-card...
Alain
Em 15-06-2011 11:51, Alain Mouette escreveu:
How can I make a big (6Mb) bootable image to use in the CD?
This is the only part of the CD that I can read on *any* machine, I am
using isolinux)
With lots of help fom Eric Auer, I managed to make a bootable image with
FreeDOS. Here is how I did it:
1) Program needed: NASM, which I got from Debian
$ sudo apt-get install nasm
2) program from Eric for the boot sector:
<http://ericauer.cosmodata.virtuaserver.com.br/soft/specials/sys-freedos-linux.zip>
create a directory ./sys-freedos-linux and expand it there
3) create file of the right size. 5760k was ok for me, there is some
magic in the size and not everything will be ok. (more studies needed)
$ dd if=/dev/zero of=FreeDOS.img count=11520
11520+0 records in
11520+0 records out
5898240 bytes (5.9 MB) copied, 0.408512 s, 14.4 MB/s
4) Prepare it with a FAT file system
$ sudo mkdosfs -v FreeDOS.img
mkdosfs 3.0.1 (23 Nov 2008)
FreeDOS.img has 64 heads and 32 sectors per track,
logical sector size is 512,
using 0xf8 media descriptor, with 11520 sectors;
file system has 2 12-bit FATs and 4 sectors per cluster.
FAT size is 9 sectors, and provides 2867 clusters.
Root directory contains 512 slots.
Volume ID is 0cbb7ca7, no volume label.
5) compile and write a suitable boot sector. This is a smart script by
Eric Auer that configures it with the appropiate parameters
$ ./sys-freedos-linux/sys-freedos.pl --disk=FreeDOS.img
DOS boot sector for FreeDOS.img will be created by:
nasm -o /dev/stdout -dISFAT12
./sys-freedos-linux/bootsecs/boot.asm
Using FAT12. Partn offset 0, CHS *x64x32 Drive 0, (0x0, 0x29),
SerNo CBB-7CA7, Strings ' ', 'FAT12 '.
Boot sector successfully updated.
6) mount it in a directory
$ mkdir bootimg
$ sudo mount -v -o loop,uid=you,gid=you FreeDOS.img bootimg
7) copy into it KERNEL.SYS, COMMAND.COM and all other files
8) use it just the same way then the image made from a floppy, memdisk
will recognize it. I used isolinux, here is how I created the iso:
$ mkisofs -R -v -A "FreeDOS big boot CD" -V FreeDOS-V1.x \
-b isolinux/isolinux.bin -c isolinux/boot.cat \
-no-emul-boot -boot-load-size 4 -boot-info-table \
-o /mnt/dados/Segurver/FreeDOS-V1.x.iso \
/mnt/dados/CDROM
Alain
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