Subj : Re: bootdisk on 1722K floppy
To   : comp.os.linux
From : Innocenti Maresin
Date : Thu Oct 21 2004 06:20 pm

Dubravko Gorupic wrote:
> I have a problem to boot from a bootdisk made on a floppy formated to 1722K
> with fdformat (/dev/fd0u1722). In case I place kernel (2.4.20) at the
> beginning of floppy (dd if=kernel of=/dev/fd0u1722) and then use rdev to say
> where compressed image is, when it boots, after message "Loading......", it
> resets computer.
A code in the beginning of the image 
uses BIOS and defaults to 18 sectors per track (but you need 21, obviously). 
BIOS is unable to detect a true sectors per track number 
unless a disk contains a DOS-compatible parameters table. 
See arch/i386/boot/bbootsect.s or bootsect.S (I don't know which is really used) 
few lines above the "root_defined:" label. 


> In case I place small boot filesystem at beginning of floppy (with kernel
> and some /dev/ files) and use lilo to write to floppy boot loader to load
> kernel from that boot fs, while booting, I get message "L 99 99 99 99" an so
> on (compressed image is after boot fs).
> I decompressed tomsrtbt, tried to do the similar thing (with lilo) as he
> did, but no success, always "L 99 99 99 99".
The same problem, but more easily solvable. 
Set up LILO and force it to count 21 sectors per track:

disk=/dev/fd0
        bios=           0x00
        sectors=        21
        heads=          2
        cylinders=      82



-- 
qq~~~~\	[ úá IP âåú ãåîúõòù ]   [ Read Usenet in the proper place ]
/ /\   \	[ FAQ you ] € http://www.comtv.ru/~av95/chainik.html
\  /_/ /
 \____/  Linux console notes http://www.comtv.ru/~av95/linux/console/

.