[SeaBIOS] RFC: Changing CBMEM console to run as a persistent ring-buffer

[Gerd Hoffmann]

  Hi,

> The change may also cause some hiccups if you're using a newer version
> of coreboot with an older version of cbmem (or SeaBIOS or whatever
> else reads the console):

seabios doesn't read the log, instead it'll append its own messages.
Which I expect will continue to work fine, except when it hits the end
of the log buffer, where seabios will simply stop logging instead of
rolling over.

cheers,
  Gerd