On Fri, 2015-06-26 at 01:25 +0000, David Lin wrote:

Both the drivers are operable for the same chip part number 8897 and 
its modules (boards) manufactured out there. The PCI Device ID is a 
fixed value (by chip/manufacturer) on those modules. As said earlier, 
the two drivers are for mac80211 host mac, and firmware mac 
respectively. They serve different purposes. Users need to choose 
which driver they want to use for the same wifi hardware, and they 
cannot use both of them at the same time. The mwifiex is more widely 
used now and sta centric. We do not want to break it.

I am not sure but I believe they are also multiple flavors of driver 
for some other chips. Any advice how they are handled, considering 
that changing the hardware/board is not an option? I guess we want 
the community to be better served using the same hardware. Opinion 
from others are welcomed.

Hmm, interesting, I didn't realize it was the same device.

Perhaps it simply shouldn't conflict at build time, and you can
recommend to blacklist one or the other? Or, in fact, return an error
from probe if you can't find the correct firmware file, so the other
driver would be attempted?

Although "-D__CHECK_ENDIAN__" does not put into Makefile, I had used 
"C=2 CF="-D__CHECK_ENDIAN__" to check warnings for endian and remove 
these warnings.

Ok. Then I guess my issues were mostly due to 64-bit system.

If you think we need to add this to Makefile and make sure zero 
warning messages, we will do that (only for sparser).

Well it just helps not forget adding CF=-D... to the command line, it's
equivalent. I just prefer it in a sense since then if people run with
C=1 or C=2 they get that part for free, and since the driver is clean
to start with then that's a good thing to do I think.

I'll try to take a closer look later.

johannes