[SeaBIOS] [PATCH 5/6] sercon: split-output implementation

[Gerd Hoffmann]

On Fri, 2017-09-08 at 14:53 -0400, Kevin O'Connor wrote:
> On Fri, Sep 08, 2017 at 08:18:27AM +0200, Gerd Hoffmann wrote:
> > Allows to run the serial console in parallel with a vga display.
> > Output will show up on both vga and serial line.
> > Input will be accepted from both keyboard and serial line.
> 
> [...]
> > +        SET_LOW(sercon_enable, (mode == 0x03));
> 
> [...]
> > +        // sercon disabled - verify not 0x03 modeset and otherwise
> > exit
> > +3:      popl %eax
> > +        cmpw $0x0003, %ax
> > +        jne 5f
> 
> Minor note - I realized after I sent my last patch that doing:
> 
>     SET_LOW(sercon_enable, (mode <= 0x07));

I don't think so.  0,1,2,3,7 are text modes, but 4,5,6 not.

cheers,
  Gerd