memtest86 for FreeBSD boot?

[Don Bowman]

> From: Romain Kang [mailto:romain at kzsu.stanford.edu]
> Has anyone put together a version of memtest86 
> (http://www.memtest86.com/)
> that can sit in the root directory next to the FreeBSD kernel?
> 
> My lab at work has a several racks of 1U boxes, most of which has
> a CD-ROM or floppy installed.  If we suspect RAM problem in one of
> the machines, we have to unrack the box, open it up and hook up
> another drive to run memtest86.  I notice that Linux boxes that
> boot with GRUB or LILO seem to use HDD-based memtest86 without
> problem.  It looks like a matter of coming up with a suitable .lds
> file to do the same for FreeBSD, and it's probably obvious enough
> that someone has done it before...

Change the '. =' in the lds file as below.

OUTPUT_FORMAT("elf32-i386");
OUTPUT_ARCH(i386);

ENTRY(_start);
SECTIONS {
/*      . = 0x10000; */
        . = 0xc0120000;
        _start = . ;
        .data : {
                *(.data)
        }
}