linux-kernel - LS21 + HPET = boot hang (since 2.6.24-rc1)

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Message-Id: <1233974209.7141.7.camel@localhost.localdomain>
Date:	Fri, 06 Feb 2009 18:36:49 -0800
From:	john stultz <johnstul@...ibm.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Clark Williams <williams@...hat.com>
Subject: LS21 + HPET = boot hang (since 2.6.24-rc1)

Hey Thomas, 
	Just a heads up, Clark noted that on LS21s if the HPET is enabled in
the BIOS, recent kernels hang at boot.

I booted the current -git up after enabling HPET and sure enough:

ENABLING IO-APIC IRQs
..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
..MP-BIOS bug: 8254 timer not connected to IO-APIC
...trying to set up timer (IRQ0) through the 8259A ...
..... (found apic 0 pin 2) ...
....... failed.
...trying to set up timer as Virtual Wire IRQ...
..... failed.
...trying to set up timer as ExtINT IRQ...
..... failed :(.
Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with
apic=debug and send a report.  Then try booting with the 'noapic'
option.

Full boot log attached. Disabling the HPET in the BIOS boots up fine.

I then did some rough bisection to see when this showed up and
apparently it hit sometime between 2.6.23 and 2.6.24-rc1.

I'll do some further bisection on it next week, but if you have any
quick ideas let me know. 

thanks
-john

View attachment "boot.log" of type "text/x-log" (8144 bytes)