[SeaBIOS] [Qemu-devel] seabios serial console vs. sgabios

[Daniel P. Berrange]

On Thu, Nov 02, 2017 at 05:04:20PM +0100, Gerd Hoffmann wrote:
>   Hi,
> 
> One problem we have with the serial console support in seabios and
> sgabios:  It can happen that both are activated.  We'll go fix that in
> qemu, but that'll work for new qemu versions only, not for the old
> already released ones.
> 
> So I think it would be useful if seabios makes sure sgabios and serial
> console are not both active at the same time, i.e. in case we find
> "vgaroms/sgabios.bin" being present either turn off builtin serial
> console, or don't load sgabios (and possibly also enable builtin serial
> console).

Historically libvirt will always use '-device sgabios' if the user has
requested <bios useserial='yes'/>.  So if that -device arg is given, I
think QEMU must honour it, which implies QEMU must disable Seabios'
own built-in serial console impl in that scenario.

Regards,
Daniel
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