[syslinux] Large Floppy Images

[Murali (முரளி கணபதி)]

http://www.mahamurali.net/downloads contains two shell scripts
(towards bottom of the page) to convert a standard bootable floppy
image to a larger (what ever size you want) memdisk bootable floppy
image. Also dont forget to pass in the right geometry information to
memdisk.

- Murali

On 4/12/07, Remko van der Vossen <wich at stack.nl> wrote:
> Hello,
>
> On Thu, Apr 12, 2007 at 12:31:33PM +0200, Bernd Blaauw wrote:
> > improper bootdisk then. Adding a DOS bootsector under Linux on an empty
> > disk image doesn't seem to be easy,
> > I remember some PERL script being used to implement a FreeDOS bootsector
> > for example.
>
> This is indeed not particularly easy. I've made a 10MB ms-dos image a
> few years back by mkdosfs under linux, dd-ing in a boot sector from an
> ms-dos 1.44mb image and hex editing the boot sector to include the
> correct geometry and copying the files (including hidden and system
> files of course) to the 10MB image which you can mount through loopback.
> I succeeded in booting from such an image with isolinux+memtest and also
> in bochs.
>
> Something along the lines of:
>
> # dd if=/dev/zero of=floppy.img bs=512 count=23040
> # mkdosfs -F12 floppy.img
> # dd if=floppy.img of=boot.sct bs=512 count=1
> # dd if=bootablefloppy.img floppy.img bs=512 count=1
> - hexedit floppy.img correcting the msdos fat header attributes
>   ie set correct geometry (cyls=80, heads=8, spt=18) set correct fat
>   sizes, sectors per clustor, root directory sector, etc. copy from
>   boot.sct where necessary
> # losetup /dev/loop0 floppy.img
> # mount -t msdos /dev/loop0 /mnt/floppy
> # losetup /dev/loop1 bootablefloppy.img
> # mount -t msdos /dev/loop1 /mnt/bootablefloppy
> - copy all files including hidden and system files) from
>   /mnt/bootablefloppy to /mnt/floppy
> # umount /mnt/bootablefloppy
> # losetup -d /dev/loop1
> - copy necessary files from other install floppies
> # umount /mnt/floppy
> # losetup -d /dev/loop0
>
> I do not have such an image at hand however, plus that ms-dos is
> licensed software and thus not mine to hand out. I could make such a
> FreeDOS image, but that probably would only complicate things if you
> want to make an ms-dos installer floppy image.
>
> Regards,
>
> Remko van der Vossen.
>
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-- 
Murali

கற்றது ைகமண் அளவு, கல்லாதது உளகளவு
(What we know is only a handful, what we dont is the rest of the world)