[haiku-development] Re: booting from partition on flash drive
- From: Caitlin Shaw <rogueeve@xxxxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Mon, 21 Sep 2009 15:08:27 -0700
>> Just wondering if it would be too much to ask for someone to produce
>> makebootable binaries for linux and windows that could make a beos
>> partition on a flash drive bootable? A standard MBR that can boot
>> any OS in a primary partition would also be a nice touch.
>>
My computer (an Acer Aspire 5720z) would not boot the image off the
flash drive either, although there was no apparent reason why it should
not. Perhaps that is why. Anyway, I used a Linux version of makebootable
to get my haiku booted the first time. I don't know about a windows
version, it would probably be 800 lines long ;), but if you use windows
you can boot up off a linux livecd such as the one that comes with
gparted, just cut and paste the source into a text file, "gcc
makebootable.c -o makebootable" and you'll have a binary.
/*
* Tiny version of Haiku's makebootable for Linux
*
* Copyright 2008, Stefan Schramm, mail@xxxxxxxxxxxxxxxxxx
* Distributed under the terms of the MIT license.
*
* Changelog:
* 2009-07-26: fixed compilation warnings due to bad printf-format
* usage (thanks to gordonjcp for pointing that out)
* 2008-12-08: replaced example "hda4" with "hdaX" for safety
*
* Compiling: gcc makebootabletiny.c -o makebootabletiny
*/
#include <stdio.h>
#include <fcntl.h>
#include <linux/hdreg.h>
static const int partitionOffsetOffset = 506;
int main(int argc, const char *const *argv) {
// check argument count
if (argc < 2) {
printf("Usage: %s <partition>\n", argv[0]);
printf("Example: %s /dev/hdaX\n", argv[0]);
return 1;
}
// open handle to partition
int part = open(argv[1], O_RDWR);
if (part < 0) {
fprintf(stderr, "Error: Failed to open partition %s\n", argv[1]);
return 1;
}
// get geometry
struct hd_geometry geom;
if (ioctl(part, HDIO_GETGEO, &geom) < 0) {
fprintf(stderr, "Error: Failed to get device geometry\n");
close(part);
return 1;
}
// display geometry
printf("determined partition start (sectors): 0x%lx\n", geom.start);
// go to partition offset offset and read current configuration
lseek(part, partitionOffsetOffset, 0);
long buf = 0;
read(part, &buf, 4);
printf("old bootcode configuration: 0x%lx\n", buf);
if (buf == geom.start) {
printf("bootcode already configured correctly - exiting.\n");
close(part);
return 0;
}
// write partition offset
lseek(part, partitionOffsetOffset, 0);
write(part, &geom.start, 4);
printf("bootcode configured - exiting.\n");
close(part);
return 0;
}
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