On Fri, Apr 01, 2016 at 01:07:55PM +0200, Gerd Hoffmann wrote: > On Fr, 2016-04-01 at 11:17 +0100, Richard W.M. Jones wrote: > > On Fri, Apr 01, 2016 at 11:18:30AM +0200, Gerd Hoffmann wrote: > > > Hi, > > > > > > > I wonder how we can make use of this in qemu and downstream distros? > > > > Can we have a bios-min.bin which is used with -kernel boots? > > > > > > We already build two seabios roms: one full featued and one slightly > > > stripped down to keep it below 128k, for backward compatibility with old > > > machine types. > > > > > > Adding a third config for -kernel boot should be easy. For that use > > > case we can probably also turn on seabios logging to the serial console > > > and drop sgabios. We don't need input (no boot menu) and we also don't > > > need to hook into int10 (no grub/ipxe using that for output). > > > > SeaBIOS logging is slow (or more likely, serial output is slow). > > And sgabios is useful for debugging. > > Ah, I see. debuglevel=1 prints too much and debuglevel=0 has no logging > at all. We'd need seabios log at least the version banner to serial > even with debuglevel=0 to replace sgabios.
The debug level of messages in SeaBIOS are a bit haphazard today. I think it would be a good idea to document what types of messages go in each debug level and then update the current debug messages to fit that description. It sounds like level=1 is too verbose today. -Kevin
