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From: maguire@cs.columbia.edu (Gerald Q. Maguire)
Newsgroups: comp.sys.hp
Subject: Re: The LEDs on the front panel of HP 9k/400's
Message-ID: <MAGUIRE.91Jan14024938@cs.cs.columbia.edu>
Date: 14 Jan 91 08:49:38 GMT
References: <JCO.91Jan10144253@reef.cis.ufl.edu>
	<JCO.91Jan11081736@reef.cis.ufl.edu>
	<JCO.91Jan12162900@reef.cis.ufl.edu>
Sender: maguire@cs.columbia.edu (Gerald Q. Maguire)
Distribution: comp
Organization: Columbia University Department of Computer Science
Lines: 55
In-Reply-To: jco@reef.cis.ufl.edu's message of 12 Jan 91 21:29:00 GMT

If you are using HP-UX the following code will let you read the ROM
area on the 9000/3xx machines. I suspect that it will let you read the
ROM area on the 9000/4xx machines also. The LEDs have the same
location on the 9000/3xx machines as you have indicated they do on the
9000/4xx. After reading the ROM area - I have used GDB to follow the
code trying to understand what the error code which the LEDs display
are. It would be useful if there were a simple table of these error
codes in the documentation which comes with the machine.

Chip

#include <stdio.h>
#include <fcntl.h>
#include <sys/iomap.h>

main()
{
  char buf[1024];
  int fd;			/* input file descriptor */
  int i;			/* loop index */
  int address = 0;
  char *rom;

  fd = open("/dev/rom", O_RDONLY);
  if ( fd < 0 ) {
    fprintf(stderr, "unable to do open /dev/rom\n");
    exit(-1);
  }

  if (ioctl(fd, IOMAPMAP, &address) < 0) {
    fprintf(stderr, "mapping operation failed\n");
    exit(-1);
  } else {
    fprintf(stderr, "mapped in rom at %x\n");
  }

  rom = (char *) address;

  for (i = 0; i <= 1*1024*1024; i=i+1024) {

    if (write(1, &rom[i], 1024) < 0)  {
      fprintf(stderr, "failed writing buffer %d \n", i);
      exit(-1);
    }

  }

  if (ioctl(fd, IOMAPUNMAP, address) < 0) {
    fprintf(stderr, "unmapping operation failed\n");
    exit(-1);
  }

  close(fd);

}