[U-Boot-Users] Software watchdog on mpc8247

[Mike Rapoport <mike.rapoport@gmail.com>]

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)@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.