Serial console not working on EP8343M

[Ed Swierk]

OK, problem solved. Once I kicked out that nasty IPMI driver,
everything works, including the serial console without udbg-immortal.

Lessons learned:

- passing "udbg-immortal loglevel=9 initcall_debug" to the kernel will
give you much more visibility into early init problems (at least on
powerpc arch circa 2.6.20)

- building U-Boot 1.2.0 with DEBUG defined in ft_build.c helps in
troubleshooting flat device tree problems

- the Abatron BDI2000 is an incredibly useful tool: source-level
debugging of U-Boot and the Linux kernel, starting at instruction zero
*swoon*

--Ed