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Full Discussion: read sectors from disk failed with timeout
Special Forums Hardware Boot Loaders read sectors from disk failed with timeout Post 302552170 by wljackhero on Friday 2nd of September 2011 12:38:58 AM
Old 09-02-2011
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.
 

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LEARN ABOUT DEBIAN

recovermov

RECOVERMOV(1)							   User Commands						     RECOVERMOV(1)

NAME

       recovermov - recover movies from a filesystem image

SYNOPSIS

       recovermov [options] device

DESCRIPTION

       Recovermov  tries  to  identify mov movies from a filesystem image. To achieve this goal, it scans the filesystem image and looks for a mov
       structure at blocks starting at 512 bytes boundaries.

OPTIONS

       -h     Display an help message.

       -b blocksize
	      Set the size of blocks in bytes. On most file systems, setting it to 512 (the default) will work fine as	any  large  file  will	be
	      stored  on 512 bytes boundaries. Setting it to 1 maximize the chances of finding very small files if the filesystems aggregates them
	      (UFS for example) at the expense of a much longer running time.

       -i integerindex
	      Set the initial index value for image numbering (default: 0).

       -n basename
	      Basename to use to create the salvaged files. Default is video_.

	      All the sizes may be suffixed by a k, m or g letter to indicate KiB, MiB or GiB. For  example,  6m  correspond  to  6  MiB  (6291456
	      bytes).

EXAMPLES

       Recover as many movies as possible from the memory card located in /dev/sdc:

	 recovermov /dev/sdc

       Recover	as  many  movies  as  possible from a crashed ReiserFS file system (which does not necessarily store files at block boundaries) in
       /dev/hdb1:

	 recovermov -b 1 /dev/hdb1

AUTHOR

       Recovermov has been written by Jan Funke <jan.funke@inf.tu-dresden.de>.

COPYRIGHT

       Copyright (c) 2010 Jan Funke <jan.funke@inf.tu-dresden.de>.  This is free software; see the source for copying conditions. There is NO war-
       ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO

       recoverjpeg(1)

recovermov							   January 2010 						     RECOVERMOV(1)
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