On 10 June 2015 at 22:36, Fu Wei <fu.wei@xxxxxxxxxx> wrote: > On 10 June 2015 at 22:22, Timur Tabi <timur@xxxxxxxxxxxxxx> 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. > >> >> -- >> 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 -- 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
