Hi,
while I was tinkering with palmtx and preparing it for mainline, I noticed, 
that certain SD cards doesnt work (both Kingston - made by Toshiba).

I came across this 
http://kerneltrap.org/mailarchive/linux-kernel/2007/9/28/325179
The person there had the same problem.

The attached patch fixed it for me, but this solution isnt definitelly 
correct. Though it should point out what's the actual problem very well.