[SeaBIOS] [PATCH] don't produce overly large images

[Gerd Hoffmann]

  Hi,

> > However, SeaBIOS should be managing the space between 0xc0000-0xfffff,
> > and SeaBIOS does not care about the padding.  So I'm not sure how this
> > patch helps.
> 
> As said in the description, I consider it desirable, as the pointless
> padding was at least confusing to me.

Flash chips (as real hardware) usually have power-of-two sizes.
I would be confused by a 192k rom ...

> If it being merely cosmetic
> makes the patch undesirable to you, I'll have to live with that
> (and hope to remember to not be confused the next time I have
> to look at the rather difficult to understand build logic).

When touching this logic I think we should go for a config option.

Current qemu seabios builds end up being around 128k in size.  Depending
on the compiler used you'll get a 128k (gcc 4.4) or a 256k rom (gcc 4.7
+).  The size of the rom changing is a problem because it breaks qemu
live migration.

Explicitly specifying the size would solve this.  You can specify
size=128k then and the build will fail if it doesn't fit.  You can
specify size=256k and you'll get a 256k rom even if it would fit into
128k.  And we could allow size=192k too ;)

cheers,
  Gerd