On Mon, 2009-08-24 at 12:31 +0530, Sachin Sant wrote:

While trying to boot 2.6.31-rc7 on a power6 machine came
across the following Bug. 

Starting udev: ------------[ cut here ]------------
kernel BUG at drivers/rtc/rtc-ps3.c:36!
cpu 0x0: Vector: 700 (Program Check) at [c0000000f70f3570]
    pc: c00000000059a020: .ps3_get_time+0x3c/0x84
    lr: c00000000059a018: .ps3_get_time+0x34/0x84
    sp: c0000000f70f37f0
   msr: 8000000000029032
  current = 0xc0000000f8d14ee0
  paca    = 0xc0000000012cc300
    pid   = 159, comm = hwclock
kernel BUG at drivers/rtc/rtc-ps3.c:36!

static u64 read_rtc(void)
{
....
result = lv1_get_rtc(&rtc_val, &tb_val);
BUG_ON(result);

I had never tried enabling CONFIG_RTC_DRV_PS3 option before
so not sure if this is a new problem or an old one. 

Looks like an old one, or at least as long as the driver has existed.

The code needs to cope with being called on something other than a PS3.
Either the platform driver is only registered if the machine is a PS3,
or ps3_rtc_probe() actually does something to check it's on a PS3 before
registering the rtc_device.

cheers