Serial Console on XServe and yaboot???

Benjamin Herrenschmidt benh at
Wed Mar 12 18:46:25 EST 2003

On Wed, 2003-03-12 at 04:33, Bill Fink wrote:
> I'd like to use the serial port on the XServe as a serial console.
> I enabled CONFIG_SERIAL_CONSOLE in a 2.4.20-0.7b (YDL 2.3) kernel,
> set the OF input-device and output-device parameters to ttya, and
> booted with the kernel argument "console=ttyS0,38400".
> This actually works once the system starts booting.  My problem
> is that I never get a chance to interact with yaboot and thus for
> example can't select a different Linux kernel to boot.  Is there
> any way to accomplish this, for example by some suitable modification
> to the ofboot.b file in the boot partition?  Or is this just not
> supported by the hardware?
> Thanks in advance for any help or pointers, or even for informing
> me that this is a hopeless quest.

iirc, there is something weird with the OF params for the console
on the xserve. Try changing these:

intput-device    "scca"
output-device    "scca"
input-device-1   "scca"
output-device-1  "scca"


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