On Tue, Nov 25, 2008 at 3:05 PM, Wolfgang Denk <wd@denx.de> wrote:

Dear Matt,

In message <b5e2fc790811251131g63ea9444x57ec0829ca0b069e@mail.gmail.com> you wrote:
>
> There is also no reason you can't hard-code the locations into the device
> tree, to support older U-Boots that don't know about
> /chosen/linux,log-metadata and /chosen/linux,log-buffer*.

Actually there is such reason - U-Boot traditionally allocates the log
buffer close to the upper end of system memory, so the start address
depends on the memory size on the board, which may vary.

I think I covered that in "I can think of a bunch of reasons why it's a good idea.. " - but the current implementation is hardcoded in the kernel so there is no problem with *certain* boards having it done this way, and that information being moved from the kernel into a static entry in a device tree.