Subject: Re: no netbootable boot prog
To: Manuel Bouyer <>
From: Michael Thompson <>
List: port-vax
Date: 04/19/2002 12:23:50
I installed 1.5CZ on a MV-III+/GPX by MOP booting from a UltraSparc-1
running 1.5.2.

At 03:41 PM 4/19/02 +0200, Manuel Bouyer wrote:
>unless I missed something, since the switch to ELF it's not possible
>to netboot a vax any more: the vax wants to load a file in mop format,
>which was produced by the mopa.out utility from the a.out boot file.
>Now the boot file is ELF and I didn't find any way to produce a a.out file.
>I can see 2 solutions:
>1) build a a.out in addition to the ELF one
>2) convert mopa.out to read ELF files.
>If we go 2) then we shall make mopa.out a host tool and reinclude boot.mop
>as part of the distribution. I think it's the best way of handling it.
>I played a bit with 1), however, to see if there is a simple way of getting
>my vax boot again (I installed a ELF kernel, so I need a ELF-aware boot prog
>now). objcopy can't convert boot to a.out because of the .rodata sections.
>Using a ld script stolen from perp, I've been able to get a boot with 
>.rodata merged in .text. Ignoring .comment I can convert it to a.out,
>and mopa.aout seems happy with it. However the vax doesn't want to load it:
>  2..
>  1..0..
>        PC = 002F6601
>I guess something's wrong with the script (alignement, or size, or
something -
>a vax isn't a powerpc after all :)
>I won't spend more time on this yet. However I suspect converting
>mopa.out to mopelf should be very easy for anyone familiar with vax/ELF
>(mopa.out.c if only 87 lines long once copyrigth have been stripped).
>Manuel Bouyer, LIP6, Universite Paris VI. 

Michael Thompson