Peter Korsgaard wrote:

- It doesn't respect console= and still outputs console messages even
  if console isn't ttySx (E.G. if CONFIG_SILENT_CONSOLE is enabled in
  U-Boot which sets 'console='

I believe it uses /chosen/linux,stdout-path; u-boot could clear that if 
silent console is desired.

As that isn't always desirable, add a PPC_UDBG_16550_CONSOLE kconfig
symbol to let the user disable it (only visible if CONFIG_EMBEDDED).

There's an existing CONFIG_PPC_EARLY_DEBUG that it could depend on instead.

-Scott