RS600 439 + problem with graphical card

hello, I have the following problem, on having installed Suse ppc, it gives me the following message "You may not see any kernel console output, use a serial console on com1 in this case" Machine = RS600 43P model 140 tipo 7043 604e 332 MHZ Graphical card = GXT550P I have tried with "boot cdrom:,zimage root=/dev/cdrom load_ramdisk=1 console=ttyS0,9600 but, nothing Thank you.