Additions to powerpc Beta2 errata & notes on a fix

[Daniel Dickinson <alemc.2@bmts.com>]

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Would it be possible to add a note to the beta2 errata for
oldworld powerpc that the quik-install/openfirmware setups fails, and
that one needs to manually set the OpenFirmware boot-device.

It should also be noted that in many cases, ouput-device and
input-device before rebooting, otherwise completing the install is
impossible due to being unable to read messages that are sent to the
console (which defaults to openfirmware's input/output devices, which on
many old world machines is the serial port)

If /proc/device-tree can be included in the miBoot floppies (the
hd-media and cd installs already include this support) I think I have
the beginnings of a solution:

If /proc/dev-tree/alias/screen exists
    nvsetenv output-device screen
else
    Search /sys for a device of type 'display'
    If there's more than one, ask which to use
    Set output-device to the OF firmware name (this information is
    supplied in same directory as the 'display' device)
endif
I
if /proc/dev-tree/alias/kbd exists
    nvsetenv output-device kbd
else
    not sure, will have to check if there is a way to do this
fi

The boot-device fix:

First you determine what device under /sys is the boot device's
controller, then you figure out what that corresponds to
under /proc/device-tree.  Then you figure out the boot disk's
OF name, based on it's /sys name.  

This last bit is trickiest, and I'll have to see if I can figure it out
after I test the latest daily build.

- -- 
And that's my crabbing done for the day.  Got it out of the way early, 
now I have the rest of the afternoon to sniff fragrant tea-roses or 
strangle cute bunnies or something.   -- Michael Devore

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