AT91_WDT_WDD
delta = (tmp & AT91_WDT_WDD) >> 16;
wdt->mr = (WDT_HW_TIMEOUT * 256) | AT91_WDT_WDRSTEN | AT91_WDT_WDD |
#define AT91_WDT_SET_WDD(x) (((x) << 16) & AT91_WDT_WDD)