54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/********************************************************/
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/* Rootset.c - modify Linux bootdisk root device entry */
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/* - quick Turbo C hack by Iain_Reid@ed.ac.uk */
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/********************************************************/
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#include <stdio.h
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#include <conio.h>
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#include <process.h>
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#include <dos.h>
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void main(int ac, char **av)
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{
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char buf[512];
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if (ac != 3) {
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fprintf (stderr, "%s: update Linux bootimage root device details.\n",
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av[0]);
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fprintf (stderr, "Usage: %s <Major> <Minor>\n", av[0]);
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exit (-1);
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}
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/**************************************************************/
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/* Don't remove this keypress bit 'cos it gives you a chance */
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/* to run this program from your dos boot floppy, remove that */
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/* disk, put your linux boot disk into the same drive, patch */
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/* in the new root device details and save them. No HD or */
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/* rawrite required! (v. handy if DOS is dead) */
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/**************************************************************/
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printf ("Insert Linux boot disk into drive A and press any key\n");
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getch();
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if (absread (0, 1, 0, &buf) != 0) {
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perror ("Disk reading problem");
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exit (-1);
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}
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printf ("Current rootdevice: Major %d Minor: %d\n", buf[509], buf[508]);
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buf[508] = atoi (av[2]);
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buf[509] = atoi (av[1]);
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if (abswrite (0, 1, 0, &buf) != 0)
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{
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perror ("Disk writing problem");
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exit (-1);
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}
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printf ("New rootdevice: Major %d Minor: %d\n", buf[509], buf[508]);
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exit(0);
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}
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