-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 25.09.2010 21:38, Aleksandar Radovanovic wrote: > Re the patch, I agree - applying that patch will effectively turn the > driver into a softdog.
To be honest: bcrm47xx_wdt driver isn't a hardware watchdog either. I had spent some time inspecting the module source and googling around and it seems that the fire time for the ssb hardware watchdog being set in "tick" (cycles qty) units maxing at 0xFFFFFFF. This means that fire time would be ~2.5 seconds on 100MHz systems, and ~2 seconds on 133MHz systems. I don't know the implementation details for broadcom boards so I can't tell for sure if any plls are used to make CPU run at 240Mhz. If the watchdog timer will be clocked at CPU freq then it would lower fire time to ~1 second. Looks like that such a low fire time is inappropriate for the non-realtime kernel and the developer of the driver "extended" hardware watchdog timer with a software one. Thus the current driver acts like this: wait till software timer fires -> warn user that the watchdog will fire soon -> arm hardware watchdog to fire after 0xFFFFFFF cycles -> do nothing waiting till hardware timer fires and reboots the device. It is obvious that in case some huge kernel disaster happen this watchdog wouldn't be able to reboot the device making driver almost the same as softdog. For now I had modified my working copy of openwrt sources to exclude bcrm47xx_wdt driver from build (it makes possible to use softdog instead). Still it would be great to figure out why does the bcrm47xx_wdt driver work with your Asus WL-500gP v1 and don't work with my D-Link DIR-320. - -- Best regards, Alexey Loukianov mailto:[email protected] System Engineer, Mob.:+7(926)218-1320 *nix Specialist -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJMnjo9AAoJEPB9BOdTkBUL+jMH/RXszDXm09l/kJTyT9xdNhu5 67lwSnVMYabLRM0fVjGSItk0nGj5eqUWZyb7vVtROHSZc0CPGle0Ys7r8ATYI07M +IIELDuqhFeyJnvcS9uL0TO2mUJAPsSxcctPxj3ovXfrgnJKhmgsagPADFI3yx3R GgqFE/9hqy5fZHW9Q8eMx4Vs4ac/vbZhVrGUDGlba6vv6ve7qsqOWfnYGak8nojt gdPEGI4cySNSRGEcyTmmUwqwGR0c9tcIbe0fZ/QxdRflImxkxiZDQkQD8iQRXfUE jxzYPMD8ZDmxvWqNnV/INcZZWoN5gC+5jE1T9c2DbptO9iFjTSfOk7xDEZ0xEag= =slKu -----END PGP SIGNATURE----- _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/mailman/listinfo/openwrt-devel
