A real shame. The Walker would have been a good machine. I never knew there was a PCMCIA slot on it before.
It also looks as if there's a slot for a keyboard ribbon, like the 1200...
Is there an Early Startup menu on the Walker? You might get it to boot manually, with no startup sequence.
I've heard that 4GB+ support was built into 3.2, but maybe it's not working properly. What size drive are you trying to use?