Mike Rapoport wrote:
On 8/25/05, Jerry Van Baren gerald.vanbaren@smiths-aerospace.com wrote:
What did you set the SYPCR to (actual values, preferably from a disassembly/dump)?
Here's the output of "objdump -dS u-boot" : /* Initialise the SYPCR early, and reset the watchdog (if req) */ /*--------------------------------------------------------------*/
lis r3, (CFG_IMMR+IM_REGBASE)@hfff03198: 3c 60 f0 01 lis r3,-4095 #if !defined(CONFIG_COGENT) lis r4, CFG_SYPCR@h fff0319c: 3c 80 ff ff lis r4,-1 ori r4, r4, CFG_SYPCR@l fff031a0: 60 84 ff c3 ori r4,r4,65479 stw r4, IM_SYPCR@l(r3) fff031a4: 90 83 00 04 stw r4,4(r3) #endif /* !CONFIG_COGENT */ #if defined(CONFIG_WATCHDOG) li r4, 21868 /* = 0x556c */ sth r4, IM_SWSR@l(r3) li r4, -21959 /* = 0xaa39 */ sth r4, IM_SWSR@l(r3)
Actual SYPCR setting is 0xFFFFFFC7 I verified that this code is executed.
I've tried to add WATCHDOG_RESET() call in board_init_f just before the initialization sequence was run, but it didn't change anything.
What is your bus clock?
66MHz
What do you figure your timeout to be?
2 sec
Do you write to the SYPCR only once to set up the WDT (only the first write to the SYPCR "works").
Yes
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?
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.
gvb