Re: [Qemu-devel] 128Kb bios size and older machines?

[Gerd Hoffmann <kraxel@redhat.com>]

On Do, 2014-02-06 at 12:28 +0400, Michael Tokarev wrote:
> Since the "small" (128Kb) seabios is now built without
> support of xen, does that mean that xen will be unable
> to use qemu with -M 1.7 and before?  Does it _ever_ use
> -M option like this?

As far I know xen has its own seabios builds anyway as they
have to add hvmloader to the mix.  Thats why it has been
turned off in the upstream blob builds, nobody will use these
with xen anyway.

Not sure how all that is organized in the debian xen/seabios packages.

> I'm asking because I don't really understand how this works.
>  We updated seabios in debian to 1.7.4 (with qemu 1.7), it
> grew past 128Kb, and now I'm trying to understand what
> exactly is broken and how to fix it.  I should either
> build it w/o xen support for it to fit in 128Kb again,
> or keep it at larger size and live with (migration) breakage
> caused by different bios size.

Turn off xhci should be enough to make it fit into 128k again (used to
be the case for me last time I tried).

> BTW, recompiling seabios-1.7.4 without xchi and a few other
> recently added stuff (pvscsi boot et al) with gcc-4.7.2 on
> debian does not produce 128Kb binary, it is larger than 128k,
> so I can't produce 128kb bios on debian anymore.. ;)

Hmm.  I had the same problem with gcc 4.4 on rhel6, but gcc 4.7+ works
for me.  No idea, sorry.

cheers,
  Gerd