From the PR:
Without this patch GCC optimizer removes all card driver code
resulting in nonworking rom image.
There are some bugs in GCC-3.4.2, maybe updating system compiler to latest
gcc snapshot will be good idea also.
This still occurs in 7-current gcc version 3.4.4 [FreeBSD] 20050518.
So adding in the patch.
Submitted by: Radim Kolar