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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 MOJAVE

avconvert

AVCONVERT(1)						    BSD General Commands Manual 					      AVCONVERT(1)

NAME

     avconvert -- movie conversion tool

SYNOPSIS

     avconvert [-hvq] --p <preset_name> --s <source_media> --o <output_movie>

DESCRIPTION

     avconvert can be used to compress video media to different types for sharing on the web or loading onto devices.

     -h       prints usage information and available presets

     -v       sets the console output to verbose

     -q       sets the console output to quiet

     -prog    shows progress during the export (default with -v)

     -p | --preset name
	      converts the source media to an output file using the specified preset. Use --listPresets to get the full list. Common presets are:

	      PresetAppleM4VCellular
	      PresetAppleM4ViPod
	      PresetAppleM4VWiFi
	      PresetAppleM4VAppleTV
	      PresetAppleM4V480pSD
	      PresetAppleM4V720pHD
	      PresetAppleM4V1080pHD
	      PresetAppleM4A

     -s | --source file
	      is the source media file

     -o | --output file
	      is the output movie file

     --listPresets
	      lists all of the presets avconvert supports

     --listTracks
	      lists the available tracks in the source media. Must be used with the --source flag

OPTIONS

     Optional flags to configure the audio export settings

     -adr number    a limit value for the data rate for the audio track in bits per second

     -af fourCC     sets the format of the audio output using a fourCC eg. aac

     -sr number     configures the sample rate of the output in Hertz. eg. 44100

     -cc number     is the channel count of the output eg. 1 (for mono) 2 (stereo) 4 (quad)

     Optional flags to configure the video export settings

     -vdr number    a limit value for the video data rate in bits per second

     -th number     sets the height of the output video in pixels

     -tw number     sets the width of the output video in pixels

     -vc fourCC     sets the format of the video output using a fourCC eg. avc1

     -fr number     sets the frame rate of the output video in frames per second

     -kr number     specifies how often keyframes appear in the output video

     -fr yes | no   sets whether or not to enable frame reordering (b-frames)

     Optional flags configuring track and metadata output

     -ot name	    omits the listed track type from the exported movie Allowable track types are:

		    videoTrack
		    audioTrack
		    subtitleTrack
		    chapterTrack
		    thumbnailTrack
		    closedcaptionTrack
		    textTrack

     -md file	    sets the file from which the metadata for the export is found if that is different from the source movie

EXAMPLES

	  avconvert --listPresets

     Lists the available presets that can be used for export

	  avconvert --preset AppleM4ViPod --source sample_movie.mov --output ipod_movie.m4v

     Exports the source movie "sample_movie.mov" to "ipod_movie.m4v" using the iPod encoding preset

	  avconvert --preset AppleM4VAppleTV --source sample_movie.mov --output appletv_movie.m4v -adr 128000 -sr 441000

     Overrides the AppleTV defaults for audio data rate and sample rate in the output movie

	  avconvert --preset AppleM4VAppleTV --source sample_movie.mov --output appletv_movie.m4v -ot audioTrack

     Omits the audio track from the output file "appletv_movie.m4v"

HISTORY

     avconvert command first appeared in Mac OS X 10.7.

Mac OS X							 December 14, 2011							  Mac OS X
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