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From netboot-owner@baghira.han.de Thu Sep 16 12:08:44 1999
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Date: Wed, 15 Sep 1999 13:10:28 +0200 (CEST)
From: Petr Olivka <Petr.Olivka@vsb.cz>
To: netboot@baghira.han.de
Subject: netboot image on hard disk - it is easy
In-Reply-To: <37DF4BD4.E8FFF8FC@gsmbox.com>
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It is good joke, at this moment I have only simple version of MBR to load
image from HD, but only from track 0. HD have to have enough sectors per
track for rom image.
And small program in turbo-pascal to download image to HD.
below is assembler code for MBR. Is writen for tasm and tlink.
If you have 512 bytes binary file with MBR code, then concat it with
rom-image and download to hda. BUT NOT DIRECTLY !!!! You have to copy
partition table ( and NT signature ) to MBR and then download. BUT ONLY tO
TRACK 0.
Everything in your own risk.
If I will have some free time, I will write some code directly to netboot.
poli
.model large, pascal
.code
.386
public mbrasm, mbrend
ROMLOAD equ 5000h
org 600h
mbrasm proc
cli
xor ax, ax
mov ss, ax
mov sp, 7C00h
mov si, sp
mov es, ax
mov ds, ax
sti
cld
mov di, 600h
mov cx, 100h
rep movsw
db 0EAh
dw offset @@jump
dw 0
@@jump:
mov si, offset Hlaska
call @@print
; rozmery prvniho HD
mov ah, 8
mov dl, 80h
int 13h
jc @@chyba
; dh - H, cx - CS
; prvi stopa obsahuje bootrom, tak ji natahneme do RAM
mov ah, 2
mov al, cl
and al, 3Fh
dec al
mov dx, 80h
mov cx, 2
mov bx, ROMLOAD
mov es, bx
xor bx, bx
int 13h
jc @@chyba
; hromada kodu podle zdrojaku netboot
xor di, di
mov es, di
mov di, 380h
push di
mov cx, 10
cld
rep stosw
pop di
mov word ptr [ di ], 5a5ah
mov byte ptr [ di + 2 ], 50h
mov word ptr [ di + 10h ], 0FFFFh
mov word ptr [ di + 12h ], 0FFFFh
; navratova adresa, kdyby nezabrala ROM
mov OfsErr, offset RomErr
push cs
push offset @@chyba
mov ax, ROMLOAD
mov es, ax
push es
; kouzelny jump....
mov si, es:[ 1ah ]
push word ptr es:[ si + 1ah ] ; ...do bootrom v RAM
retf
@@chyba:
mov si, OfsErr
call @@print
mov si, offset CRLF
call @@print
jmp @@chyba
@@print:
lodsb
cmp al,0
je @@navrat
push si
mov bx,7
mov ah,0Eh
int 10h
pop si
jmp @@print
@@navrat:
retn
Hlaska db 13, 10, 'HD Net Loader v1.0 (c) poli 1999', 13, 10, 0
CRLF db 13, 10, 0
OfsErr dw offset Error
Error db 'Error load from HD !', 0
RomErr db 'ROM Error !', 0
mbrasm endp
mbrend proc
ret
mbrend endp
org 800h - 2
dw 0AA55h
end
===========================================================================
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