Messages in this thread | | | Date | Wed, 10 Jun 2015 22:36:51 +0800 | Subject | Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver | From | Fu Wei <> |
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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 ----------
if some hardware doesn't support writing WCV, that means this hardware is non-standard SBSA watchdog.
> > -- > Sent by an employee of the Qualcomm Innovation Center, Inc. > The Qualcomm Innovation Center, Inc. is a member of the > Code Aurora Forum, hosted by The Linux Foundation.
-- 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
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