hello world debug info

[Eric Blossom <eb@starium.com>]

> break at bssclr
> break at boot_card
> break at rtems_initialize_executive_early
> break at rtems_initialize_executive_late

Just a wild guess, but I'd say that the initial stack is allocated in
the BSS and that bssclr is stomping it.  Then depending on what is
contained at address 0 on the ppc, you're being revectored into
boot_card or something that proceeds it.

Eric