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Date: Fri, 12 Aug 2005 18:39:13 -0700
From: Shaun Jackman <sjackman@gmail.com>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Subject: Re: Trouble shooting a ten minute boot delay (SiI3112)
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2005/8/12, Jan Engelhardt <jengelh@linux01.gwdg.de>:
> >I tried earlyprintk=vga, but it didn't provide any extra information.
> >Although, CONFIG_EARLY_PRINTK is disabled in my .config. Does it need
> >to be set to CONFIG_EARLY_PRINTK=y for earlyprintk=vga to work?
> 
> I think yes, otherwise there would not be a .config entry at all.
> 
> >I haven't tried Sysrq+T yet. I'll report back.
> 
> Mind that it is unlikely to get a good trace at this stage, but it's worth the
> try.

I compiled a vanilla 2.6.12.4 kernel, enabled EARLY_PRINTK and
rebooted with earlyprintk=vga. The kernel didn't display any extra
information before the delay.

$ uname -a
Linux quince 2.6.12.4 #1 Fri Aug 12 13:02:40 PDT 2005 i686 GNU/Linux
$ cat /proc/cmdline
root=/dev/md0 ro nodma earlyprintk=vga
$ grep EARLY_PRINTK /boot/config-2.6.12.4
CONFIG_EARLY_PRINTK=y

I tried Alt-SysRq-T but there was no response. SYSRQ is enabled.
$ grep SYSRQ /boot/config-2.6.12.4
CONFIG_MAGIC_SYSRQ=y

Cheers,
Shaun