Seg fault on any FB write (Epson S1D13A04 on Coldfire running 2.6.25)

I've been working on porting the s1d13xxxfb driver from the latest 
kernel from Freescale for Coldfire to work with the S1D13A04 chip. I was 
able to get things working to the point that I do get a little TUX logo 
up on the screen at boot up. Seemed like a good start but none of my 
user space applications will work. I can open the /dev/fb0 device and 
the data in the info structure is correct but if I try to write to any 
register or area in the frame buffer (or write to the device at all) I 
get a seg fault.

I had an earlier driver working with the 2.6.10 kernel with the same 
hardware. The same application space program should work ( I would 
think...) but I get the seg fault on the first write to fb0. I tried a 
different memory location (ox4400 0000 to 0x7400 0000) for the CS 
associated with the video  chip, no  difference. Permissions for 
/dev/fb0 are "rw". No other process using fb0. This is really weird.

Any help or suggestions MUCH appreciated.

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