After struggeling with a useless staging diver from the kernel tree I finally managed to build the vendor driver.
Here is my approach:
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Download PRO.config from http://ppl.ug/Ze91Jqp1MEg/
wget http://download.pogoplug.com/opensource/pro/pogopro-linux-2.6.31.6-r2.tar.bz2
tar xjf pogopro-linux-2.6.31.6-r2.tar.bz
cd pogopro-linux-2.6.31.6-r2
mv ../PRO.config .config
Comment out the CROSS_COMPILE line from top-level Makefile
make oldconfig
make modules_prepare
cd
Download the driver source (Linux driver for Kernel 2.6.37(and earlier)) from http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=48&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true#2292
unzip and dir into driver directory
make
Do _NOT_ use 'make install', it killed all other modules for me
mkdir -p /lib/modules/2.6.31.6_SMP_820/kernel/drivers/net/wireless
cp 8712u.ko /lib/modules/2.6.31.6_SMP_820/kernel/drivers/net/wireless/
depmod -a
modprobe 8712u (this should work fine, check dmesg)
insert 8712u into modules array in rc.conf
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Many thanks to
viewtopic.php?f=29&t=2472Everything works great so far, using wpa_supplicant for the AP connection