[U-Boot-Users] Software watchdog on mpc8247
Mike Rapoport
mike.rapoport at gmail.com
Thu Aug 25 14:35:31 CEST 2005
On 8/25/05, Jerry Van Baren <gerald.vanbaren at 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)@h
fff03198: 3c 60 f0 01 lis r3,-4095
#if !defined(CONFIG_COGENT)
lis r4, CFG_SYPCR at h
fff0319c: 3c 80 ff ff lis r4,-1
ori r4, r4, CFG_SYPCR at l
fff031a0: 60 84 ff c3 ori r4,r4,65479
stw r4, IM_SYPCR at 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 at l(r3)
li r4, -21959 /* = 0xaa39 */
sth r4, IM_SWSR at 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
--
Sincerely Yours,
Mike.
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