On 10 June 2015 at 22:36, Fu Wei fu.wei@linaro.org wrote:
On 10 June 2015 at 22:22, Timur Tabi timur@codeaurora.org wrote:
Fu Wei wrote:
Another weakness of only using WOR is the timeout limited by this 32bit register. 10s @400MHz generic Timer
I don't think this limit is good for a server, once the server is in a heavy load
Perhaps, but if that's the limitation of the hardware, then so be it.
it is not the real limitation, if we use WCV, SBSA spec has mentioned that.
------ 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 ------ SBSA 2.3-------Page 23 ----------
------ SBSA 2.3-------Page 24 ---------- 0x010 – 0x013 WCV[31:0] 0x014 – 0x017 WCV[63:32] Watchdog compare value. *Read/Write* registers containing the current value in the watchdog compare register. ------ SBSA 2.3-------Page 24 ----------
if some hardware doesn't support writing WCV, that means this hardware is non-standard SBSA watchdog.
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-- Best regards,
Fu Wei Software Engineer Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch Ph: +86 21 61221326(direct) Ph: +86 186 2020 4684 (mobile) Room 1512, Regus One Corporate Avenue,Level 15, One Corporate Avenue,222 Hubin Road,Huangpu District, Shanghai,China 200021