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Re: serial console install issues



On Mon, 2021-04-12 at 13:48 +1200, Richard Hector wrote:
> On 11/04/21 9:26 pm, Samuel Thibault wrote:
> > Richard Hector, le dim. 11 avril 2021 21:18:49 +1200, a ecrit:
> > > On 11/04/21 9:10 pm, Samuel Thibault wrote:
> > > > $ git grep -i "Boot console" .
> > > > en/boot-installer/parameters.xml:  <title>Boot console</title>
> > > > po/[...]
> > > > 
> > > > That's very most probably it.
> > > 
> > > I think so, yes. But my problems started earlier than booting linux, at the
> > > SysLinux menu.
> > 
> > See the section, it talks about kernel arguments, which are passed from
> > the syslinux menu. See the section just before, "Boot Parameters".
> 
> Yes.
> 
> It's becoming clear that I asked/commented/complained about too many 
> things in one email :-)
> 
> I got the hang of the boot parameters, though that section doesn't 
> mention removing the 'vga=xxx' section from the linux command line. I'm 
> not sure if that's important; I'll have to retest to confirm.
> 
> But all that's irrelevant if I can't get to the linux commandline, 
> because Syslinux is misbehaving.
>
> Does anyone know if it's inherent in Syslinux that it won't work 
> correctly with a 24-line serial terminal?
[...]

I think that syslinux is working through a BIOS-emulated display and
keyboard controller, and is not aware that a serial terminal is beign
used.  The code for SeaBIOS's serial console support is here:
<https://github.com/pcengines/seabios/blob/apu_support/src/sercon.c>. 
It presents an 80x25 (or 40x25) text display as there is no VGA BIOS
mode number for 80x24.

Ben.


-- 
Ben Hutchings
The world is coming to an end.	Please log off.

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