CONFIG_SERIAL_TEXT_DEBUG causes exception

[Jerry Walden]

Hello:

I have a custom PPC405GPr board that I have successfully ported u-boot to.

I am now at the stage of trying to bring Linux up on the board.

I have CONFIG_SERIAL_TEXT_DEBUG defined for the kernel that I am trying to
bring up.  I would like to have this option so I can trace through the
kernel.
The comments in ppc4xx_setup.c in the function serial_putc indicate that as
long
as the firmware (in my case u-boot) has been initialized properly, then this
function
should work.  I have verified the addresses that the function is trying to
write to
and they are correct.  However, when serial_putc calls the first readb, I
get an
exception.

Can someone please provide some pointers as to what might be wrong?

Thanks

Jerry Walden


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