In article <Steve.007x@nyongwa.cam.org> Steve@nyongwa.cam.org (Steve Robbins) writes:
               [ ... ]

quoted text
>Another idle question (until the FAQ file comes around again):
>Having to patch the boot disk to change root drives is tricky for those
>without a C compiler under DOS.  I guess I could copy everthing over to the
>hard drive and get gcc up first.  But wouldn't it be possible to include
>that little program (a compiled version) in the installation notes on the
>root disk?  

I agree;  I have included an MSDOS extended version of Linus's 'edit'
program below; first the uuencoded executable, and then the source.
It is overkill, but is an attempt to help someone who is just starting.

Al - aclark@netcom.com - My opinions are my own.
      *** Practice random kindness and senseless acts of beauty! ***

pboot.uue - send binary mode to MSDOS system, or edit to remove
control M's and send text mode converting from unix to MSDOS
(which will add the control M's back in).

======================== cut here ========================================
begin 644 pboot.exe
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end
=====================  cut here = source below ==================
/*
 *  pboot.c - patch bootimage before writing it to floppy using rawrite
 *            for MSDOS - turboc 
 *            Copyright Linus Benedict Torvalds and Al Clark
 *               (based on his edit program)
 *            Copy and modify freely for use with linux 
 *                 This is overkill, in an attempt to help
 *                 naive users.
 */

#include <alloc.h>
#include <bios.h>
#include <ctype.h>
#include <dir.h>
#include <dos.h>
#include <io.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
char tmp[512];
char fname[64];
char oname[64];
/*
0x300 - whole /dev/hd1 - don't use 
0x301 - /dev/hd1 - first partition on first drive
0x302 - /dev/hd2 - first partition on first drive
 */
atoh(s)    /* ascii to hex converter */
char *s;
{
        char *p;
        int c, j, i = 0;
        for (p = s; *(p+1) != '\0'; p++) {
                c = *p;
                if (isdigit(c))
                     j = (c - '0'); 
                else if (!isxdigit(c))
                     return(-1);  /* not hexidecimal */
                else if (c < 'a')  /* Upper case */
                        j = (c - 'A') + 10;
                else     /* lower case */
                        j = (c - 'a') + 10;
                i = 16 * i + j;
        }
        return(i);
}

void main(void)
{
        int i, num, fdin, fdout;
        char buf[16];
        short disk;
  fprintf(stderr,"Pboot - Patch Linux boot image for hard disk\n");
  fprintf(stderr,"  Enter hard disk partition \n");
  fprintf(stderr,"  Examples: 0302 = /dev/hd2\n");
  fprintf(stderr,"            0303 = /dev/hd3\n");
  fprintf(stderr,"  Enter hard disk partition: ");
  fgets(buf, 8, stdin);
  disk = atoh(buf);
  if (disk < 0) {
        fprintf(stderr, "  %s contains a non hex digit - aborting\n", buf);
        exit(1);
  }
  fprintf(stderr, "  Patching boot image for hard drive %x\n", disk);
  fprintf(stderr, "Enter source file name (or \"quit\" to abort): ");
  scanf("%s", fname);
  if (!strncmp(fname, "quit", 4)) exit(1);
  _fmode = O_BINARY;
  if ((fdin = open(fname, O_RDONLY)) <= 0) {
     perror(fname);
     exit(1);
  }
  fprintf(stderr, "Enter destination file name: ");
  scanf("%s", oname);
  _fmode = O_BINARY;
  if ((fdout = open(oname, O_RDWR | O_APPEND | O_CREAT)) <= 0) {
     perror(oname);
     exit(1);
  }
        if ((i = read( fdin,tmp,512)) !=512 ) {
                fprintf(stderr, "read error - only %d bytes\n", i);
                exit(1);
        }

        if (0xAA55 != *((unsigned short *)(tmp+510))) {
                fprintf(stderr, "contents of 510 = %x\n", *(tmp+510));
                exit(2);
        }
        *((unsigned short *)(tmp+508)) = disk;
        if (512 != write(fdout,tmp,512)) {
                fprintf(stderr, "write error on %s: ", oname);
                perror("write");
                exit(3);
        }
        fprintf(stderr, " wrote patched record- copying balance of file ");
        num = 1;
        while ((i=read(fdin,tmp,512)) > 0) {
                num++;
                putc('.', stderr);
                if (i != write(fdout,tmp,i)) {
                        fprintf(stderr, "write error on %s: ", oname);
                        perror("write");
                        exit(4);
                }
        }
        fprintf(stderr, " Done - \"rawrite\" %s to floppy\n", oname);
        exit(0);
}
-- 
Al - aclark@netcom.com - My opinions are my own.
      *** Practice random kindness and senseless acts of beauty! ***