serial port kernel configuration problem for PowerMacs

[Joseph Sacco <jsacco gnome org>]

There is a well known device number contention bug

        https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=155895

that prevents serial ports on PowerMacs from functioning when 8250
support is built directly into the kernel. 

While we wait [forever???] for LANANA to assign a set of device numbers
for pmac_zlog that do not conflict with those assigned to the 8250,
there is a simple workaround:

        build 8250 support as a loadable module:
        
        #
        # Serial drivers
        #
        CONFIG_SERIAL_8250=m
        CONFIG_SERIAL_8250_PCI=m
        CONFIG_SERIAL_8250_PNP=m
        
I don't know of any platform that has both 8250 and pmac_zilog serial
ports so this should be a painless workaround.


-Joseph

-- 
jsacco [at] gnome [dot] org