Hi,
On 03/24/2014 12:53 AM, Henrik Nordström wrote:
> sön 2014-03-16 klockan 14:53 +0100 skrev Hans de Goede:
>> void reset_cpu(ulong addr)
>> {
>> + static const struct sunxi_wdog *wdog =
>> + &((struct sunxi_timer_reg *)SUNXI_TIMER_BASE)->wdog;
>> +
>> + /* Set the watchdog for its shortest interval (.5s) and wait */
>> + writel(WDT_MODE_RESET_EN | WDT_MODE_EN, &wdog->mode);
>> + writel(WDT_CTRL_RESTART, &wdog->ctl);
>> + while (1);
>
> This code is incomplete and do not reload the watchdog if already
> running. wdog->ctl is locked by a magic key. Should use
>
> writel(WDT_CTRL_KEY | WDT_CTRL_RESTART, &wdog->ctl);
>
> where
>
> #define WDT_CTRL_KEY (0x0a57 << 1)
>
> Unfortunatley Allwinner kindly omitted this little detail from the User
> Manual.
>
> Found out while trying to use the watchdog as a watchdog and not only
> reset. Asked Tom while he still was at Allwinner and got clarification
> on how to use the watchdog control register.
Thanks, I'm currently working on v2 of this series and I've included this
fix.
Regards,
Hans
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