Marco Stornelli wrote: > Il 13/03/2010 00:31, Jamie Lokier ha scritto: > > That'd be fine if the kernel link scripts choose the address, as long > > as it's consistent between different compiles and similar > > configurations. That'd be a bit simpler than the admin having to know > > the memory map well enough to choose an address. > > > > -- Jamie > > > > I agree, but the bootloader should be aware of it. I mean, usually > bootloaders at boot, reset the RAM, so you have to tell to the > bootloader that you are using a piece of RAM as persistent RAM, for > example U-Boot has got a specific option CONFIG_PRAM. I don't know if > all the process can be completely transparent to the admin in all > situations. Sometimes you can't change the bootloader (they don't always come with source code). Or you could, but you don't want to risk it (there isn't always a way to recover if you break it). Obviously then the feature is only useful when the bootloader doesn't clear all the RAM :-) On slow boards in consumer devices, they sometimes avoid clearing the RAM because that adds measurable boot time. -- Jamie -- 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
