Il 06/01/2011 19:22, Luck, Tony ha scritto: >> Errata corrige: maybe I used the wrong term, I meant "volatile" instead >> of "temporary" information, i.e. I'd like to save this info to re-read >> it later but I don't want to store it in flash, a simple log, run-time >> information for debug like a flight-recorder or whatever you want. > > I'm puzzled by the use of "a generic piece of memory" to store "persistent" > things (Perhaps this is made clear in the 17 parts of the patch? I haven't > read them yet). On x86 f/w typically clears all of memory on reset ... so > you only get persistence if you use kexec to get from the old kernel to > the new one. > > -Tony > First of all, you can find a lot of information on the web site where there is an overview and a page with implementation details, benchmark and so on. With "a generic piece of memory" I mean a generic memory device directly addressable. Usually this generic device is an NVRAM, so we have a persistent store. If you haven't got this hw you can use other devices or the classic RAM, in this case you have a fs persistent only over reboot. The use of this fs is mainly for embedded systems, fw can be configured to not clear *all* the memory. Pramfs is indeed supported by U-Boot, you can see CONFIG_PRAM in the Das U-Boot manual. x86 in this case can be a "strange" world for this fs, but however if the user wants it can be used without problems because there aren't neither strict arch or hw dependency. Marco -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
