Re: [Ppcboot-users] Software watchdog timer doesn't work for 860P , using ppcboot and 2.4 linux

[ Sorry to bother you all good folks with my troubles
related to software watchdog, I have spent some time
going through 8xx manual couple times, still don't get
it ;( ]

--- Wolfgang Denk <wd@denx.de> wrote:

In message
[off-list ref]
you wrote:

quoted

Thanks for the pointer, I downloaded that patch
however even with that patch my board resets right
after it
prints the message --
"Transferring control to Linux (at address

00000000 )

quoted

..."

Are you sure it works without the watchdog enabled?
Even with the  WD
you  should have somthing like 2 seconds before it
resets - more than
enough time to spit out some boot messages.

Yes the board boots and linux works for hours, without
any problems, if  I put #undef CONFIG_WATCHDOG in my
board_config.h for ppcboot.

quoted

I printed value of SYPCR just before this printf

and

quoted

SYPCR is set at 0xFFFFFF8F does this value look
correct?

This value indicates that SWTC is 0xFF and
SWE, SWF, SWRI, SWP bits are all set to 1s.

Looks good to me.

Just to see why the board was getting reset I modified
the code of ppcboot to print value of RCR register of
8xx.  ANd here is what I am seeing

When I initially power up the system, RCR comes out as
0xC0000000

Now if I let the board download kernel and ramdisk and
boot. Upon reset RCR's value is set to 0xD0000000
which indicates that board was reset due to Software
watchdog reset.


Now I wonder if something is wrong with my clock
settings?

This is what is in my board_config.h

#define CFG_PLPRCR_MF   (20-1)
                /* 8 * 4 MHz = 32 MHz Clock */
#define CFG_PLPRCR
             ( (CFG_PLPRCR_MF << PLPRCR_MF_SHIFT) | \
                PLPRCR_SPLSS | PLPRCR_TEXPS |
PLPRCR_TMIST)

#define CONFIG_8xx_GCLK_FREQ
                    ((CFG_PLPRCR_MF+1) * 4000000)


When PPCBoot starts up it prints message

CPU: XPC860xxZPnnD4 at 80 Mhzl 16 kB I-Cache 8kB
D-cache FEC present

I have also tried setting baud rate to 38400 and
changing the kernel logging level from 7 to 1, the
board still resets.
Any other 8xx register I should be looking at?

HELP!!

John


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/