Re: Problem in resetting Davinci processor from watchdog Timer

Sweta Tue, 02 Jan 2007 21:10:26 -0800

Hi Monk,
I downloaded the latest u-boot from the mentioned URL but still reset doesn't work.
Further, if reset command is working, none of the other commands work & reset command calls reset_processor() from board/davinci/platform.S but it doesn't reset the processor.Upto last line all lines of this function are executed correctly.But after last line, it hangs....
What should be my next step ? Actually I want to reset the board from a software application.I m stuk up at this point.

Thanks,
Sweta
Monk, Roger wrote:

Hi Sweta,

Are you using the latest u-boot from the extranet site? I believe there were some power-up changes made to assist with watchdog reset in one of the more recent uboot versions.

https://www-a.ti.com/extranet/cm/product/dvevmsw/dspswext/download/u-boot-1.1.3_rel_00.05.04-tisb.tar.gz

~roger

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Sweta
Sent: 29 December 2006 11:35
To: Peter Wippich
Cc: [email protected]
Subject: Re: Problem in resetting Davinci processor from watchdog Timer

Hi Peter,
I tried with the same code but it didn't work.
Then I came to know that there is a slicon bug so it doesn't actually reset the processor through watchdog.
Then I tried with the workaround which is the code I mentioned in previous mail.
Perviously on one of the board it was working but on other board, same kernel image doesn't perform reboot.
So what can be the solution ?

Thanks,
Sweta

Peter Wippich wrote:

Hi Sweta,

here is the code from the 2.6.19 kernel. Maybe this helps :

void davinci_watchdog_reset(void) {

        volatile davinci_timer_regs_t *davinci_wdt =

               (volatile davinci_timer_regs_t *)IO_ADDRESS(DAVINCI_WDOG_BASE);

        davinci_wdt->tcr = 0x0;               /* disable timer */

        davinci_wdt->tgcr = 0x0;       /* reset timer */

        davinci_wdt->tgcr = 0x8;      /* configure timer2 as 64-bit */

        davinci_wdt->tgcr |= 0x3;     /* release timer from reset */

        davinci_wdt->tim12 = 0;               /* clear counter and period regs */

        davinci_wdt->tim34 = 0;

        davinci_wdt->prd12 =  0;

        davinci_wdt->prd34 =  0;

        davinci_wdt->wdtcr |= 0x4000;  /* enable watchdog timer */

        /* put watchdog in pre-active state */

        davinci_wdt->wdtcr = 0xA5C64000;

        /* put watchdog in active state */

        davinci_wdt->wdtcr = 0xDA7E4000;

        /* write an invalid value to the WDKEY field to trigger

         * a watchdog reset */

        davinci_wdt->wdtcr = 0x00004000;

On Fri, 29 Dec 2006, [EMAIL PROTECTED] wrote:

Hi Peter,

I m using Montavista Linux 2.6.10 (mvl402).

reboot code as mentioned in mail is executed properly.but then after

this line davinci_wdt->wdtcr = 0x00004000;, it doesn't execute next

statement (I tried with putting printk statement after it).

Doe it mean that it resets watchdog correctly.

But then it doesn't reset the processor & doesn't start execution of UBL

code again.

What can be the problem ?

Thanks,

Sweta

Hi Sweta,

which kernel are you using ?? It works with the 2.6.19 Kernel from GIT

tree.

Ciao,

Peter

On Thu, 28 Dec 2006, [EMAIL PROTECTED] wrote:

 Hi All,

I want to reset the Davinci pocessor using watchdog timer.

So when I give reboot command from kernel, it hangs & doesn't actually

reset the processor.

code for watchdog rest in kernel is as follows :

void davinci_watchdog_reset(void) {

        volatile davinci_timer_regs_t *davinci_wdt = (volatile

davinci_timer_regs_t *)IO_ADDRESS(DAVINCI_WDOG_BASE);

        davinci_wdt->tcr = 0x0;         /* disable timer */

        davinci_wdt->tgcr = 0x0;        /* reset timer */

        davinci_wdt->tgcr = 0x8;        /* configure timer2 as 64-bit */

        davinci_wdt->tgcr |= 0x3;       /* release timer from reset */

        davinci_wdt->tim12 = 0;         /* clear counter and period regs

*/

        davinci_wdt->tim34 = 0;

        davinci_wdt->prd12 =  0;

        davinci_wdt->prd34 =  0;

        davinci_wdt->tcr   |= 0x00000040;

        davinci_wdt->wdtcr |= 0x4000;   /* enable watchdog timer */

        *(volatile unsigned int *)(0x01c41a20) = 0x00000000;

        /* put watchdog in pre-active state */

       davinci_wdt->wdtcr = 0xA5C64000;

       /* put watchdog in active state */

       davinci_wdt->wdtcr = 0xDA7E4000;

      /* write an invalid value to the WDKEY field to trigger* a

watchdog

reset */

          davinci_wdt->wdtcr = 0x00004000;

But it hangs & doesn't actually reset the processor.

I tried with reset commnad from u-boot loader also. It also gives me the

same  result.

Can anyone Help me out to debug what is wrong ?

Thanks in advance,

-Sweta

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Re: Problem in resetting Davinci processor from watchdog Timer

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