On 8/25/05, Jerry Van Baren gerald.vanbaren@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