Serial setup hang (Re: FC2 test1: install glitches and comments)

[Ricky Ng-Adam <rngadam yahoo com>]

Hello!

Ricky Ng-Adam wrote:

> > On Sat, Feb 14, 2004 at 01:03:04AM -0500, Ricky Ng-Adam wrote:
> >
> > > -on reboot after install... Kernel Stopped booting after agpgart and
> > > Serial: 8250[...]IRQ sharing enabled lines.  Poweroff/poweron seems
> >
> >
> > Seen this, its as if any serial interrupt occuring during the serial 
> > setup
> > or before it hangs the box. I've not yet been able to get much further as
> > I've not yet found a box I have it will boot all the way on except with
> > the install CD
> >
> > I also see similar problems with IRQ 12 sharing, then disable then hangs
> > and then since IRQ 12 is _really_ used by something other than the 
> > non-existant PS/2 mouse it tried to enable that hangs too.

BTW, I can reproduce systematically this problem by

 powering up the laptop + restarting Linux = hang

So there seems to be something that is supposed to happen when shutting 
down for reboot that doesn't.

I also noticed that in the IBM BIOS under serial port there are three 
options:

  Disabled
  Enabled
  OS controlled [Displayed when controlled by OS]

I've tried both Disabled and Enabled (3F8 IRQ4) but both result in the 
reproducible hang.  I've never seen the "OS controlled" option.

Thanks,

Ricky