Re: [Xenomai-help] Using Xenomai in early boot phase.

[Philippe Gerum <rpm@xenomai.org>]

Wolfgang Grandegger wrote:
> Wolfgang Grandegger wrote:
>> Philippe Gerum wrote:
>>> Wolfgang Grandegger wrote:
>>>> Hello,
>>>>
>>>> I want to use a Xenomai task overtaking the duties of a watchdog running
>>>> under Linux as soon as the Xenomai layer is available during boot up. Is
>>>>   there a function or variable I could inspect? With 2.3.x, I called
>>>> rtdm_init_task() until it returned without error but with 2.4.x it
>>>> results in a kernel crash :-(.
>>>>
>>> What is the value of CONFIG_XENO_OPT_SYS_STACKPOOLSZ?
>>   #
>>   # Nucleus options
>>   #
>>   CONFIG_XENO_OPT_PERVASIVE=y
>>   CONFIG_XENO_OPT_SYS_STACKPOOLSZ=32
>>   # CONFIG_XENO_OPT_PRIOCPL is not set
>>   CONFIG_XENO_OPT_PIPE=y
> 
> Some more input on that issue. Here is the oops and the NIP location:
> 
> XLB Arb cnf: 8000a006
> mpc5xxx_ide: Setting up IDE interface ide0...
> Probing IDE interface ide0...
> Oops: kernel access of bad area, sig: 11
> NIP: C0113364 XER: 20000000 LR: C0113320 SP: C047DB30 REGS: c047da80 TRAP: 0300    Not tainted
> MSR: 00001032 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 11
> DAR: 0000003C, DSISR: 20000000
> TASK = c047c000[1] 'swapper' Last syscall: 120
> last math 00000000 last altivec 00000000
> GPR00: 00000003 C047DB30 C047C000 00000009 FFFFFFF7 C01CF395 C0220000 00000000
> GPR08: 00000038 C01ECC00 C02445F4 00000000 00000000 100803B0 07FCF000 08099000
> GPR16: C0220000 FFFFFF7F C0230000 FFF75F97 C022B3C0 00000000 C01ECC0C C0230000
> GPR24: 00000000 00000000 00000010 C02446F4 3B9A0000 00000000 00000000 C0244590
> Call backtrace:
> C0113320 C0111F00 C010DD0C C013D810 C00DA48C C001EAB4 C001A70C
> C001A598 C001A254 C00079C0 C000D63C C0024C50 C00243AC C000D298
> C000D508 C0005CF4 0039FBC0 C00F0A4C C00F0EA0 C00F15C0 C00F210C
> C02149C8 C0214A14 C020A64C C00039A0 C0008678
> Kernel panic: Aiee, killing interrupt handler!
> In interrupt handler - not syncing
>  <0>Rebooting in 180 seconds..
> 
> $ ppc_6xx-gdb vmlinux:
> ...
> (gdb) l *0xC0113364
> 0xc0113364 is in __xntimer_init (queue.h:51).
> 46              holder->last = holder;
> 47              holder->next = holder;
> 48      }
> 49
> 50      static inline void ath(xnholder_t *head, xnholder_t *holder)
> 51      {
> 52              /* Inserts the new element right after the heading one  */
> 53              holder->last = head;
> 54              holder->next = head->next;
> 55              holder->next->last = holder;
> 
> Wolfgang.
> 

Thanks. Could you send me the full boot log until the oops occurs as well? TIA,

-- 
Philippe.