read sectors from disk failed with timeout

09-02-2011

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read sectors from disk failed with timeout

i'm writing some code to simulate the boot progress after power on
but when i try to read the 2nd sector from a floppy disk, this operation always fail with ah=0x80h which means timeout, how can i get over this problem?
my code would be like this:

Code:

[jack@localhost 1]$ cat boot.S
.code16
#define SETUPLEN  4
#define BOOTSEG  0x7C0
#define INITSEG  0x900

.text
a:
mov $BOOTSEG, %ax
mov %ax, %ds
mov $INITSEG, %ax
mov %ax, %es
mov $256, %cx
sub %si, %si
sub %di, %di
rep
movsw

jmp 0x9000+go-a

go:
mov %cs, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %ss
mov $0xFF00, %sp

load_setup:
mov $0x0000, %dx
mov $0x0002, %cx
mov $0x0200, %bx
mov $0x0200+SETUPLEN, %ax
int $0x13                           //timeout happens here
jnc ok_load_setup
mov $0x0000,%dx
mov $0x0000,%ax
int $0x13
jmp load_setup

ok_load_setup:
mov $0x00, %dl
mov $0x0800, %ax
int $0x13
mov $0x00, %ch
mov %cx, %cs 
mov $INITSEG, %ax
mov %ax, %es

mov $0x03, %ah
xor %bh, %bh
int $0x10

mov $24, %cx
mov $0x0007, %bx
mov msg, %bp
mov $0x1301, %ax
int $0x10

msg:
.byte 13, 10


.org 510
.word 0xaa55

looking forward to replies.
really appreciate any suggestion.

wljackhero

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installgrub(1M) installgrub(1M) NAME
installgrub - install GRUB in a disk partition or a floppy SYNOPSIS
/sbin/installgrub [-fm] stage1 stage2 raw-device The installgrub command is an -only program. GRUB stands for GRand Unified Bootloader. installgrub installs GRUB stage 1 and stage 2 files on the boot area of a disk partition. If you specify the -m option, installgrub installs the stage 1 file on the master boot sector of the disk. The installgrub command accepts the following options: -f Suppresses interaction when overwriting the master boot sector. -m Installs GRUB stage1 on the master boot sector interactively. The installgrub command accepts the following operands: stage1 The name of the GRUB stage 1 file. stage2 The name of the GRUB stage 2 file. raw-device The name of the device onto which GRUB code is to be installed. It must be a character device that is readable and writable. For disk devices, specify the slice where the GRUB menu file is located. (For Solaris it is the root slice.) For a floppy disk, it is /dev/rdiskette. Example 1: Installing GRUB on a Hard Disk Slice The following command installs GRUB on a system where the root slice is c0d0s0: example# /sbin/installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c0d0s0 Example 2: Installing GRUB on a Floppy The following command installs GRUB on a formatted floppy: example# mount -F pcfs /dev/diskette /mnt # mkdir -p /mnt/boot/grub # cp /boot/grub/* /mnt/boot/grub # umount /mnt # cd /boot/grub # /sbin/installgrub stage1 stage2 /dev/rdiskette /boot/grub Directory where GRUB files reside. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ boot(1M), fdisk(1M), fmthard(1M), kernel(1M), attributes(5) Installing GRUB on the master boot sector (-m option) overrides any boot manager currently installed on the machine. The system will always boot the GRUB in the Solaris partition regardless of which fdisk partition is active. 24 May 2005 installgrub(1M)

Boot Loaders