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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