This is just a comment.  I'm not saying anything is necessarily wrong.

When I attempt to build ndiswrapper (e.g versions 1.1 or 1.4, it 
doesn't matter which) for SL4, the following warning is emitted:

 *** WARNING:  Kernel is compiled with 4K stack size option 
 (CONFIG_4KSTACKS); many Windows drivers will not work with this 
 option enabled. Disable CONFIG_4KSTACKS option, recompile and 
 install kernel

Checking the configuration (/boot/config-*) for the kernels in 
question, one can see indeed that CONFIG_4KSTACKS=y is set.

I suppose that this kernel build option is deliberate (same as the 
"upstream vendor", whatever)...?

I can report that for at least one wireless card that I have tried 
with ndiswrapper, the driver seems to work OK, despite this warning. 
WIth a different card and its driver, however, the kernel hangs and 
the machine has to be forcibly shut down.

In other respects I've been quite happy with ndiswrapper, as I've said 
on this list before, and I'd recommend it as a solution, particularly 
to folks who have occasion to use different wireless cards at 
different times, irrespective of the availability of "native" linux 
drivers for them.  (Version 1.2, now outdated, did not build on SL303, 
however).

But it would be quite a nuisance if every kernel had to be rebuilt to 
accommodate it.

Comments, please?