* Re: Book-E watchdog driver questions
[not found] <46F93E54.5050203@gmail.com>
@ 2007-09-25 17:42 ` Kumar Gala
2007-09-25 18:18 ` Mike Nuss
0 siblings, 1 reply; 4+ messages in thread
From: Kumar Gala @ 2007-09-25 17:42 UTC (permalink / raw)
To: Mike Nuss; +Cc: PowerPC dev list
On Sep 25, 2007, at 11:59 AM, Mike Nuss wrote:
> Hi,
>
> I have a PPC440EPx and I am testing out the builtin watchdog. I have a
> couple of questions:
>
> Is there a reason that booke_wdt.c does not specify a MODULE_LICENSE?
>> From the copyright notice at the top it appears to be GPL. As
>> written,
> it taints the kernel.
Odd, no reason. I'll submit a patch for that.
> Also, if I test out the driver by killing my process that's doing the
> pinging, I get a kernel panic:
Its been a while since i've tried this. I'll try it out and see what
happens.
- k
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: Book-E watchdog driver questions
2007-09-25 17:42 ` Book-E watchdog driver questions Kumar Gala
@ 2007-09-25 18:18 ` Mike Nuss
2008-01-03 14:46 ` Mike Nuss
0 siblings, 1 reply; 4+ messages in thread
From: Mike Nuss @ 2007-09-25 18:18 UTC (permalink / raw)
To: Kumar Gala; +Cc: PowerPC dev list
> > Is there a reason that booke_wdt.c does not specify a MODULE_LICENSE?
> >> From the copyright notice at the top it appears to be GPL. As
> >> written,
> > it taints the kernel.
>
> Odd, no reason. I'll submit a patch for that.
>
> > Also, if I test out the driver by killing my process that's doing the
> > pinging, I get a kernel panic:
>
> Its been a while since i've tried this. I'll try it out and see what
> happens.
I also found that GETBOOTSTATUS returns 0 after the reboot. Looking at
the source code I found the comment "XXX: something is clearing TSR" -
I take that to mean that the register is being cleared by something
before the module tries to read it? In my case U-Boot may be clearing
that - I can take a look.
Mike
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Book-E watchdog driver questions
2007-09-25 18:18 ` Mike Nuss
@ 2008-01-03 14:46 ` Mike Nuss
0 siblings, 0 replies; 4+ messages in thread
From: Mike Nuss @ 2008-01-03 14:46 UTC (permalink / raw)
To: Kumar Gala; +Cc: PowerPC dev list
On Sep 25, 2007 1:18 PM, Mike Nuss <mikenuss@gmail.com> wrote:
> > > Is there a reason that booke_wdt.c does not specify a MODULE_LICENSE?
> > >> From the copyright notice at the top it appears to be GPL. As
> > >> written,
> > > it taints the kernel.
> >
> > Odd, no reason. I'll submit a patch for that.
> >
> > > Also, if I test out the driver by killing my process that's doing the
> > > pinging, I get a kernel panic:
> >
> > Its been a while since i've tried this. I'll try it out and see what
> > happens.
The kernel panic was caused because TCR: WIE was set. This bit should
not be set, because it causes the timer to generate an interrupt that
the kernel does not handle.
>
> I also found that GETBOOTSTATUS returns 0 after the reboot. Looking at
> the source code I found the comment "XXX: something is clearing TSR" -
> I take that to mean that the register is being cleared by something
> before the module tries to read it? In my case U-Boot may be clearing
> that - I can take a look.
It turns out that the status bits in TSR are undefined at poweron
reset. Boards require external logic to detect POR - this is described
in AMCC's app note for the WDT. Because of this, U-Boot clears TSR
early on in the standard 4xx firmware (in start.S). To use TSR to
detect a watchdog reset, U-Boot must be modified to check that logic
and only clear the bits at POR. Those bits will be preserved until the
kernel driver looks at them, or until the system is powered off. So
the driver is correct here, but the comment should be updated to
explain why the GETBOOTSTATUS value may not be meaningful - it
requires additional hardware and firmware support.
I can submit a patch for these issues if you like.
Mike
^ permalink raw reply [flat|nested] 4+ messages in thread
* Book-E watchdog driver questions
@ 2007-09-25 16:59 Mike Nuss
0 siblings, 0 replies; 4+ messages in thread
From: Mike Nuss @ 2007-09-25 16:59 UTC (permalink / raw)
To: linuxppc-dev
Hi,
I have a PPC440EPx and I am testing out the builtin watchdog. I have a
couple of questions:
Is there a reason that booke_wdt.c does not specify a MODULE_LICENSE?
>From the copyright notice at the top it appears to be GPL. As written,
it taints the kernel.
Also, if I test out the driver by killing my process that's doing the
pinging, I get a kernel panic:
Bad trap at PC: c0009268, MSR: 29000, vector=1022 Tainted: P
Oops: Exception in kernel mode, sig: 5 [#1]
NIP: C0009268 LR: C00092C4 CTR: C002F6E4
REGS: c02d7f50 TRAP: 1022 Tainted: P (2.6.21-rc4-ts-1-ppc)
MSR: 00029000 <EE,ME> CR: 24D12582 XER: 00000000
TASK = c02809d0[0] 'swapper' THREAD: c029c000
GPR00: 00000000 C029DF90 C02809D0 00000000 C0008294 00000000 00072951
00000000
GPR08: 00002D0F C02D9800 22044288 00000000 00005196 00000000 0FFB2C00
00000001
GPR16: 007FFF23 00000000 00800000 FFFFFFFF 007FFF00 0FFAE6A0 00000000
00000001
GPR24: 00000000 007FFE70 C02D8000 C02D0000 C02E0000 C029C028 00000010
C029C000
NIP [C0009268] cpu_idle+0x64/0xd0
LR [C00092C4] cpu_idle+0xc0/0xd0
Call Trace:
[C029DF90] [C00092C4] cpu_idle+0xc0/0xd0 (unreliable)
[C029DFB0] [C00012B4] rest_init+0x28/0x38
[C029DFC0] [C029E720] start_kernel+0x220/0x29c
[C029DFF0] [C0000200] skpinv+0x1a8/0x1e4
Instruction dump:
38000010 7d20e828 7d290378 7d20e92d 40a2fff4 801f0028 393c9800 700b0008
40820064 80090030 3bc00010 2f800000 <419e0060> 7c00e828 7c00f078 7c00e92d
Bad trap at PC: c0003408, MSR: 21000, vector=1022 Tainted: P
Oops: Exception in kernel mode, sig: 5 [#2]
NIP: C0003408 LR: C0002100 CTR: 00000000
REGS: c02d7f50 TRAP: 1022 Tainted: P (2.6.21-rc4-ts-1-ppc)
MSR: 00021000 <ME> CR: 44D12522 XER: 00000000
TASK = c02809d0[0] 'swapper' THREAD: c029c000
GPR00: 08000000 C02D7DD0 C02809D0 C02D7DE0 00000001 00000001 00000000
00004000
GPR08: C02D0000 C0002100 00021002 C0003408 C0280B80 00000000 0FFB2C00
00000001
GPR16: 007FFF23 00000000 00800000 FFFFFFFF 007FFF00 0FFAE6A0 00000000
00000001
GPR24: 00000000 007FFE70 C02D8000 C02D0000 C02E0000 00000000 00000005
C02D7F50
NIP [C0003408] timer_interrupt+0x0/0x224
LR [C0002100] ret_from_except+0x0/0x18
Call Trace:
Instruction dump:
7d0b4378 7d635b78 4e800020 3d20c02d 800950bc 7c1603a6 7d4c42e6 3d20c02e
3d60c02d 9149f384 914b50b4 4e800020 <7c0802a6> 9421ffc0 be810010 90010044
Kernel panic - not syncing: Attempted to kill the idle task!
Rebooting in 180 seconds..Bad trap at PC: c00066b8, MSR: 21000,
vector=1022 Tainted: P
Oops: Exception in kernel mode, sig: 5 [#3]
NIP: C00066B8 LR: C0002100 CTR: 00033C76
REGS: c02d7f50 TRAP: 1022 Tainted: P (2.6.21-rc4-ts-1-ppc)
MSR: 00021000 <ME> CR: 44D12588 XER: 00000000
TASK = c02809d0[0] 'swapper' THREAD: c029c000
GPR00: 00182000 C02D7CF0 C02809D0 C02D7D00 00000001 00000001 00000000
00000030
GPR08: C02DB2E4 C0002100 00021002 C00066B8 C0280B80 00000000 0FFB2C00
00000001
GPR16: 007FFF23 00000000 00800000 FFFFFFFF 007FFF00 0FFAE6A0 00000000
00000001
GPR24: 00000000 007FFE70 C02D8000 C02D0000 00487AB0 00003311 C0290000
C02D0000
NIP [C00066B8] do_IRQ+0x0/0xb8
LR [C0002100] ret_from_except+0x0/0x18
Call Trace:
Instruction dump:
7fc3f378 3880000a 48073311 4bfffea0 3d20c024 38a97e9c 4bffff30 3c80c024
38847e84 7fc3f378 48073321 4bffff08 <7c0802a6> 9421fff0 90010014 bfc10008
Bad trap at PC: c00066b8, MSR: 21000, vector=1022 Tainted: P
Oops: Exception in kernel mode, sig: 5 [#4]
NIP: C00066B8 LR: C0002100 CTR: 00000000
REGS: c02d7f50 TRAP: 1022 Tainted: P (2.6.21-rc4-ts-1-ppc)
MSR: 00021000 <ME> CR: 44D12522 XER: 00000000
TASK = c02809d0[0] 'swapper' THREAD: c029c000
GPR00: C0002810 C02D7DD0 C02809D0 C02D7DE0 00000001 00000001 00000000
00004000
GPR08: C02D0000 C0002100 00021002 C00066B8 C0280B80 00000000 0FFB2C00
00000001
GPR16: 007FFF23 00000000 00800000 FFFFFFFF 007FFF00 0FFAE6A0 00000000
00000001
GPR24: 00000000 007FFE70 C02D8000 C02D0000 00487AB0 00000000 00000005
C02D7F50
NIP [C00066B8] do_IRQ+0x0/0xb8
LR [C0002100] ret_from_except+0x0/0x18
Call Trace:
Instruction dump:
7fc3f378 3880000a 48073311 4bfffea0 3d20c024 38a97e9c 4bffff30 3c80c024
38847e84 7fc3f378 48073321 4bffff08 <7c0802a6> 9421fff0 90010014 bfc10008
Bad trap at PC: c00066b8, MSR: 21000, vector=1022 Tainted: P
Oops: Exception in kernel mode, sig: 5 [#5]
NIP: C00066B8 LR: C0002100 CTR: 00000000
REGS: c02d7f50 TRAP: 1022 Tainted: P (2.6.21-rc4-ts-1-ppc)
MSR: 00021000 <ME> CR: 44D12522 XER: 00000000
TASK = c02809d0[0] 'swapper' THREAD: c029c000
GPR00: C0002810 C02D7DD0 C02809D0 C02D7DE0 00000001 00000001 00000000
00004000
GPR08: C02D0000 C0002100 00021002 C00066B8 C0280B80 00000000 0FFB2C00
00000001
GPR16: 007FFF23 00000000 00800000 FFFFFFFF 007FFF00 0FFAE6A0 00000000
00000001
GPR24: 00000000 007FFE70 C02D8000 C02D0000 00487AB0 00000000 00000005
C02D7F50
NIP [C00066B8] do_IRQ+0x0/0xb8
LR [C0002100] ret_from_except+0x0/0x18
Call Trace:
Instruction dump:
7fc3f378 3880000a 48073311 4bfffea0 3d20c024 38a97e9c 4bffff30 3c80c024
38847e84 7fc3f378 48073321 4bffff08 <7c0802a6> 9421fff0 90010014 bfc10008
This goes on for a while until it eventually reboots. Is that the
expected behavior?
Mike
^ permalink raw reply [flat|nested] 4+ messages in thread
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[not found] <46F93E54.5050203@gmail.com>
2007-09-25 17:42 ` Book-E watchdog driver questions Kumar Gala
2007-09-25 18:18 ` Mike Nuss
2008-01-03 14:46 ` Mike Nuss
2007-09-25 16:59 Mike Nuss
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