wfi.mac should be copied into the directory with the IAR project. Then set it to "Options -> Debugger -> Setup macro file(s)". This will allow debugging via JTAG when calling the WFI instruction.

Merged in david_s5/nuttx-1/david_s5/kconfig-edited-online-with-bitbucket-1463078993637 (pull request #19)

Kconfig edited online with Bitbucket

sam_xdmac.c edited online with Bitbucket

sam_xdmac.c edited online with Bitbucket

Since I can't (yet) get rid of the sanity checks in config.h, I suppose I should at least update the checks.

Backout d5be40be.  This change is logically correct but unmasks a lot of issues.  Reverted for now.