Re: buildd macs, was Re: [buildd] Etch?
On Mon, 14 Aug 2006, Wouter Verhelst wrote:
> On Mon, Aug 14, 2006 at 06:18:14PM +0200, Michael Schmitz wrote:
> > > > Not sure the RTC ever worked, but the serial drivers used to.
[snip]
> > >
> > > It appears that there is no way to collect a crash dump on this arch :-(
> >
> > Not at this early stage in booting. You'd really need to delay ADB
> > init until after syslogd starting :-) Dumping state information from
> > the ADB in handler is what I did to figure out what happened. Have fun
> > :-)
>
> Isn't it possible to get the serial port to work before ADB and then to
> use a serial console or so? You could at least catch a panic that way,
> plus whatever other debugging printk() output you want to send out.
>
> Or am I missing some crucial bit here?
You are right that serial output works from very early in the boot, even
before the framebuffer initialisation. So, if you pass "debug=ser" (or
sera/serb) you can get all the printk's etc which is very useful.
(However, /dev/ttyS* are broken, so there's no serial console
unfortunately.)
Anyway, I have the logs, what I was after was a kernel core dump, like
kdump, netdump or lkcd provides on other architectures, so as to do a
postmortem in gdb.
-f
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