[U-Boot-Users] Software watchdog on mpc8247
Mike Rapoport
mike.rapoport at gmail.com
Thu Aug 25 15:55:21 CEST 2005
On 8/25/05, Jerry Van Baren <gerald.vanbaren at smiths-aerospace.com> wrote:
>
>
> Pointing out the obvious... looking at the disassembly, it isn't
> enabling the watchdog (SWE). I'm guessing that you disassembled code
> where you had the watchdog disabled?
The instruction
fff031a0: 60 84 ff c3 ori r4,r4,65479
actually enables watchdog (65479 dec = ffc7 hex) and SWE is bit 29 of SYPCR.
> I see you have PBME and LBME enabled (I'm looking at an 8260 manual,
> assuming the 8247 is the same - feel free to correct me :-). Do you
> have a 60x bus and a local bus? Is it possible you are having an
> inadvertant bus error? This wouldn't explain why it only happens when
> you enable the WDT, however. Puzzling.
The 8247 does not have local bus, only 60x, but setting/clearing LBME
does not affect the operation. If I don't enable the watchdog the
system works fine.
Another thing I've noticed, most or even all 8260 based systems have
#undef CONFIG_WATCHDOG
in their config
--
Sincerely Yours,
Mike.
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