Writing not working to CPLD/FPGA.

Hello.

My platform is a 7447A with Marvell GT64260 bridge chip. I have currently
got the kernel upgraded to v3.12 (started from v2.6.26) and only have one
more piece to get working that has never worked. There is a CPLD on the
board. It maps in just fine and I can read the registers without issue.
However, none of my writes work. In the bootloader, I can write the CPLD
registers without issue. The preboot code in 'arch/powerpc/boot' can also
write the CPLD registers. So, write access stops working once the kernel is
booted. Using _PAGE_NO_CACHE with ioremap_prot() and other flags does not
work. Has anyone else ever encountered something similar behavior in the
past? Please CC: me. I am not subscribed to the list. Thanks in advance.

-Steve