kgdb on EM64T

[Wilkerson, Bryan P]

Thanks you Tom and George for the tips on using kgdb with
2.6.13-rc4-mm1.  

I almost have it working but kgdb seems to have a few issues.  I can get
it running from the dev machine using the kgdb and console=kgdb boot
options on the test kernel.  The kernel waits as it should and when I
attach with "target remote /dev/ttyS0" and I can continue the boot but
eventually it gets to a point in the boot where it frees unused kernel
memory successfully and then a warning, "unable to open an initial
console",  followed by, "Kernel panic - not syncing: Attempted to kill
init!"

Removing the console=kgdb boot option and the machine boots all the way
to run level 5.   I tried to break into kgdb at this point using the 
	$echo -e "\003" > /dev/ttyS0
from the dev machine but the test kernel panics at gdb_interrupt+75 when
it receives anything on the serial port.  Hmmm...

I'm wondering if I'm maybe just the first to try this on EM64T (kernel
builds in the arch/x86_64 tree).   

Any suggestions welcome.

-bryan
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