[Xen-ia64-devel] RE: [PATCH] fixed serial console support

[Alex Williamson <alex.williamson@xxxxxx>]

On Sat, 2005-12-03 at 08:33 -0800, Magenheimer, Dan (HP Labs Fort
Collins) wrote:
> I actually manually removed the #ifdefs but other than
> that I did the same.
> 
> I added some debug output and initialize_keytable is
> definitely getting called, as is serial_init_postirq,
> however either serial_init_postirq is not returning
> or serial output gets disabled... a printk I added
> after the call to serial_init_postirq is not printing.
> 
> I added some printks within serial_init_postirq.
> It calls driver->init_postirq on com[0] but this
> call never returns.
> 
> More debugging:
> 
> ns16550_init_postirq is called with port=0xf0000000040d0500,
> uart->irq = 9, then serial_async_trasmit is called and
> never returns.

   Hmm, what kind of box are you using that is setting the irq to 9?  I
don't have any boxes that use legacy serial interrupts, so there could
be a problem there.  I believe Tristan had a patch that could make
legacy interrupts work.  In the mean time, how about explicitly setting
irq = 0 before calling ns16550_init()?

...

> One possible difference: My test box has a video card
> and the EFI serial input/output are set to multiple
> inputs/outputs.  Perhaps a bogus interrupt is getting
> delivered before everything is set up to receive them?
> (doubtful... it appears interrupts are off through all
> of the above)  Or maybe it causes a xenheap allocation
> that does not occur on your system and this allocation
> has some strange interaction?

   I have VGA on my system to, but I only have the console output set to
a single device (the builtin bulkhead UART).  Setting multiple
input/output device is strongly not recommended.  If using the old
version PCDP (aka HCDP - which all currently shipping boxes use),
there's no way to pick a primary console out of the table and if there
is more than one, the PCDP code will give up.  This is the main
enhancement of PCDP vs HCDP, there is a defined primary console.  I'd be
curious to know where you're getting that irq 9 from through...  Thanks,

        Alex


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