Serial Console on XServe and yaboot???

[Benjamin Herrenschmidt]

On Wed, 2003-03-12 at 14:19, Bill Fink wrote:
> Hi Ben,
>
> On 12 Mar 2003, Benjamin Herrenschmidt wrote:
>
> > 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"
>
> Thanks for the idea, but unfortunately it had no effect, as I saw
> no yaboot screens show up when I did a reboot.  Is it possible that
> the initial OF uses a different baud rate than 38400 (although I
> didn't even see any garbage show up)?

Hrm... I did manage to get it last time I played with an xserve. I
don't remember the baudrate though (maybe 57600...)

Ben.


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