Hi Takeshi,

I saw you were struggling with getting the right peripherals detected by 
Linux.

To do that cleanly, I have added a "capabilities" register to the system. 
Register 0x38 from sysctl is now a bitmask that tells you what is inside the 
currently loaded bitstream. The value of the register is automatically derived 
from setup.v during synthesis. Bits are defined here:
http://github.com/lekernel/milkymist/blob/master/software/include/hw/capabilities.h

Please use this for probing peripherals in Linux. I also think the "board" 
kernel configuration option should be removed, better probe it at runtime 
using the ID register from sysctl (0x3c).

Sébastien
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