load image from partition other than the primary

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mathi

Joined: 29 Mar 2004
Posts: 4
Location: Chennai, India

mathi 29 Mar 2004, 19:34

hai,

I have linux and winXP in my hard disk.
I use grub to boot them. I want to boot menuetos from the hard disk.
I have also added a entry for menuetos.
I am able to load the kernel KERNEL.MNT from my /dev/hda2 (F: drive)
but the kernel does not load the ram image from the fat32 partition.
The problem now is , i don't have a primary fat32 partition. That is, the
first partition in my hard disk is not a fat32 partition. I have ext2 partition as the first partition with linux installed in it.

here is my partition table

/dev/hda1 linux partition (red hat) boot
/dev/hda2 fat32 f: drive
/dev/hda3 fat32 (winxp) boot c: drive
/dev/hda4 fat32 d: drive

/dev/hda2 was once my linux swap (512 mb)
i formatted it in to a fat32 partition to install menuetos in it.
i also don't know why xp addresses it (/dev/hda2) as my f: drive

e: -- my cd rom drive

Is there any other way to install menuetos in my f: Sad

29 Mar 2004, 19:34

Tolle

Joined: 21 Jan 2004
Posts: 71

Tolle 30 Mar 2004, 05:13

It's possible, but you will need to reassemble the kernel.
In kernel.asm you will find:

Code:

...
; READ RAMDISK IMAGE FROM HD
   
        cmp   [boot_dev],1
        jne   no_sys_on_hd
        mov   [fat32part],1       ; Partition
        mov   [hdbase],0x1f0      ; Controller base
        mov   [hdpos],1           ;
        mov   [0xfe10],dword 0    ; entries in hd cache
        mov   [0x800000+1474560/1024],dword 0xffffffff
        mov   ecx,41
      hdbootl1:
        mov   eax,hdsysimage
        mov   ebx,12
        mov   edx,1
        mov   esi,0x90000
        pusha
        call  read_hd_file
...

changing the mov [fat32part],1 to mov [fat32part],2 worked for me.

Groenten,
Tolle.

30 Mar 2004, 05:13

Wishing

Joined: 21 Feb 2004
Posts: 56
Location: NY

Wishing 30 Mar 2004, 15:44

Idea ^_^

can we replace cmp [boot_dev],1 with

cmp [boot_dev],1
ja next2
mov [fat32part],1
jmp here

next2:
cmp [boot_dev],2
ja next3
mov [fat32part],2
jmp here

next3:
cmp [boot_dev],3
ja next4
mov [fat32part],3
jmp here

next4:
cmp [boot_dev],4
jne no_sys_on_hd
mov [fat32part],4

here:

and have another question in bootcode.inc

call printplan "Choose partition to read image from"
call getkey
dec al
mov [es:boot_partition-0x10000],al

this assumes you make a address 'boot_partition' in kernal.asm

so that if you choose to boot from HDD you can choose which partition too ^_^

(just and idea.. doesnt seem too hard)
Wishing

30 Mar 2004, 15:44

LiuJunfeng

Joined: 28 Nov 2003
Posts: 48
Location: China

LiuJunfeng 30 Mar 2004, 16:11

Must the Image file be in the root directory?
I'd like load it from "C:\boot\menuet.img"
So write a complete solution for this problem

30 Mar 2004, 16:11

Wishing

Joined: 21 Feb 2004
Posts: 56
Location: NY

Wishing 31 Mar 2004, 06:15

kinda demanding arent we? this is GPL.

31 Mar 2004, 06:15

LiuJunfeng

Joined: 28 Nov 2003
Posts: 48
Location: China

LiuJunfeng 01 Apr 2004, 08:32

sorry, i can't say english very well
I mean suggestion.

01 Apr 2004, 08:32

Wishing

Joined: 21 Feb 2004
Posts: 56
Location: NY

Wishing 02 Apr 2004, 04:30

No problem.. things like that happen... ill see what i can do.

_________________
446f6c7068696e

02 Apr 2004, 04:30

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