From: hns@regent.e-technik.tu-muenchen.dbp.de (Henning Spruth)
Newsgroups: alt.os.linux
Subject: DOS program to set root device
Date: 25 Mar 92 09:06:28 GMT

Here is a small DOS program I hacked using Turbo C to be able to
conveniently set the root partition. It is quite primitive, as it
requires major/minor device numbers and can only access a boot disk in
drive A:, but it works. Using it, installing Linux can be done in
these steps:

      1. boot the Linux boot disk
      2. make HD file system
      3. run install script
      4. sync
      5. boot DOS
      6. run setroot.exe to set root file system to HD
      7. boot the Linux boot disk again

Here's the source:

------------------------- begin setroot.c ------------------------------
#include <stdio.h>
#include <bios.h>
#include <conio.h>

char buffer[512];

void check(int res)
{
  if(res==0) return;
  printf("Disk error status: %x\n",res);
  exit(1);
}

main()
{
  int result,x;
  char in[80];
  unsigned int major, minor;
  printf("\n\nInsert Linux boot disk into drive A: and hit a key ...");
  getch();
  printf("\n");
  printf("Resetting controller ...\n");
  result=biosdisk(0,0,0,0,1,1,buffer);
  check(result);
  printf("Loading boot sector ...\n");
  result=biosdisk(2,0,0,0,1,1,buffer);
  if(result==6) result=biosdisk(2,0,0,0,1,1,buffer);
  check(result);
  printf("Current major boot device: %d\n",buffer[509]);
  printf("Current minor boot device: %d\n",buffer[508]);
  printf("\n");
  printf("New device values:\n");
  printf("Enter new major device: ");
  gets(in);
  sscanf(in,"%d",&major);
  printf("Enter new minor device: ");
  gets(in);
  sscanf(in,"%d",&minor);
  printf("\nCheck: changing root disk to major %d, minor %d\n",major,minor);
  printf("Is this OK (y/n)? ");
  x=getch(); printf("\n");
  if(x!='y')
  { printf("Aborting ...\n");
    exit(0);
  }
  buffer[508]=minor;
  buffer[509]=major;
  printf("Writing boot sector ...\n");
  result=biosdisk(3,0,0,0,1,1,buffer);
  check(result);
  printf("Root device changed!\n");
}
------------------------- end setroot.c ------------------------------


Here is the uuencoded executable:

------------------------- begin setroot.uue ----------------------------
begin 664 setroot.exe
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M3U0N0P!315123T]4 ')E<P!M:6YO<@!M86IO<@!I;@!X ')E<W5L= !S:7IE
M7W0 9G!O<U]T $%415A)5 !#4%))3E1& $-465!% $58250 1D9,55-( $9)
M3$53 $9)3$53,@!&3%532$%,3 !&4T5%2P!'1513 $=05$585 !(14%03$5.
M $U/5D5415A4 %!224Y41@!0551# %!55$-( %-#4D5%3@!30U)/3$P 4T54
M55!)3P!315160E5& %-30T%.1@!35$M,14X 5$5,3 !72$5215A9 %=2251%
M %=30U)/3$P 6$9&3%532 !"24]31$E32P!"4DL 0U)424Y)5 !%3T8 1T54
M0P!'151#2 !)3T524D]2 $E3051460!,4T5%2P!,5$]! $U%34-060!214%$
M %)%041! %-#04Y.15( 4T-!3E1/3 !64%))3E1%4@!64D%- %=2251%00!#
?5E1&04L 4D5!3$-65 !30T%.5$]$ $Y%05)(14%0  !6
 
end
------------------------- end setroot.uue ----------------------------


If there is some demand, I can extend the program to use 
standard HD device names instead of major/minor device numbers.

Enjoy,

Henning


------------------------------------------------------------------------
Henning Spruth		 	  spruth@regent.e-technik.tu-muenchen.de
Institute of Electronic Design Automation
Technical University of Munich, Germany
--
------------------------------------------------------------------------
Henning Spruth		 	  spruth@regent.e-technik.tu-muenchen.de
Institute of Electronic Design Automation
Technical University of Munich, Germany