750gx cpufreq induced kernel panic in 2.6.36

2011-01-25 Thread kevin diggs
Hi, The cpufreq driver I wrote for the 750gx causes a kernel panic in 2.6.36. This is from a screen shot: [c6035f30] [c001014c] timer_interrupt+0x13c/0x19c [c6035f40] [c0013294] ret_from_except+0x0/0x14 --- Exception: 901 at 0x1000c694 LR = 0x1000f3e4 Instruction dump: 4b48 38610008 4be7

Re: 750gx cpufreq induced kernel panic in 2.6.36

2011-01-25 Thread Benjamin Herrenschmidt
On Tue, 2011-01-25 at 17:54 -0600, kevin diggs wrote: > Hi, > > The cpufreq driver I wrote for the 750gx causes a kernel panic in 2.6.36. > > This is from a screen shot: > > [c6035f30] [c001014c] timer_interrupt+0x13c/0x19c > [c6035f40] [c0013294] ret_from_except+0x0/0x14 > --- Exception: 901 at

Re: 750gx cpufreq induced kernel panic in 2.6.36

2011-01-26 Thread kevin diggs
On Tue, Jan 25, 2011 at 10:32 PM, Benjamin Herrenschmidt wrote: >> >> What are exception 700 & 901? > > 700 is a program check (illegal instruction or BUG_ON() statement) > > 900 is decrementer (aka timer) interrupt. > >> The 0x1000c694 address looks fishy? > > That's userspace. > > So you took a

Re: 750gx cpufreq induced kernel panic in 2.6.36

2011-01-26 Thread Benjamin Herrenschmidt
On Wed, 2011-01-26 at 11:20 -0600, kevin diggs wrote: > This is kind of my problem. ANY suggestions (applicable to an old > world PowerMac) would be appreciated on how to get access to the rest > of the information. This thing appears completely dead at this point. You don't have a serial port ?

Re: 750gx cpufreq induced kernel panic in 2.6.36

2011-01-26 Thread kevin diggs
On Wed, Jan 26, 2011 at 3:43 PM, Benjamin Herrenschmidt wrote: > > You don't have a serial port ? > Yeah, just did not know what to do with them? > If you do, use "sccdbg" on the kernel command line to route xmon to it, > and boot with console=ttyPZ0,38400 (I think the old things default to > 384

Re: 750gx cpufreq induced kernel panic in 2.6.36

2011-01-26 Thread Benjamin Herrenschmidt
On Wed, 2011-01-26 at 21:59 -0600, kevin diggs wrote: > Ok! Thanks! > > One thing. The 2.6 driver for the serial ports on this machine does > not work very well. Can I use a slower speed to avoid missing stuff? pmac zilog ? It should work fine on tx... unless your receiving side is the one with a