hi
i got 2.6.0-test3 to compile successfully on mandrake 9.0
basically when i got one of those i removed the feature, i can to that conclusion because when i compiled test2 i got some stuff about my network card, in test3 it worked no questions asked. so i came to the conclusion that the kernel team were working on these features and they are not yet fully formed ( slush as opposed to ice )
your error mentioned riscom8.c this refers to a character device, and this is the main reason the build stopped, basically go to character devices in the config and remove the riscom one
keep doing it untill your kernel compiles with out a hitch, then copy your config to a safe place clean up you kernel source, copy back in your config and compile it again ( this makes sure the kernel has all it bit compiled in properly ) stoping and starting the build, i have found, tends to cockup the final product
btw, you will have to update your insmod, morprobe, rmmod, and lsmod to work with you new kernel, and possibly some gcc stuff too
may i refer you to one of my previous post that covers this and at time of writing this is still ongoing:
Previous post
i hope this has helped you, dont worry about the kernel features you took out, i am sure that that bit will be fixed by the next test version