Fu Wei wrote:
SBSA 2.3 Page 23 : Note: the watchdog offset register is 32 bits wide. This gives a maximum watch period of around 10s at a system counter frequency of 400MHz. If a larger watch period is required then the compare value can be programmed directly into the compare value register.
214s means your system counter is approximately at 20MHz which is in the range of (10MHz ~ 400MHz)
SBSA 2.3 Page 13 : The System Counter (of the Generic Timer) shall run at a minimum frequency of 10MHz and maximum of 400MHz.
Thanks, that explains a lot.
If we expected customers to have a lower system counter frequency, then we wouldn't have to worry about the timeouts being too short. It seems to me that the SBSA spec says that if you want a longer timeout, you have to lower the frequency. We shouldn't be complicating the driver because some customers might not follow the spec.