btashton commented on a change in pull request #2735:
URL: https://github.com/apache/incubator-nuttx/pull/2735#discussion_r563329301



##########
File path: arch/arm/src/nrf52/Make.defs
##########
@@ -163,3 +163,89 @@ endif
 ifeq ($(CONFIG_PM),y)
 CHIP_CSRCS += nrf52_pminitialize.c
 endif
+
+ifeq ($(CONFIG_NRF52_SOFTDEVICE_CONTROLLER),y)
+
+NRFXLIB_UNPACK  := sdk-nrfxlib
+NRFXLIB_VER     := 1.4.2
+NRFXLIB_REF     := v$(NRFXLIB_VER)
+NRFXLIB_TGZ     := $(NRFXLIB_REF).tar.gz
+NRFXLIB_URL     := https://github.com/nrfconnect/sdk-nrfxlib/archive
+
+NRFX_UNPACK     := nrfx
+NRFX_VER        := 2.4.0
+NRFX_REF        := v$(NRFX_VER)
+NRFX_TGZ        := $(NRFX_REF).tar.gz
+NRFX_URL        := https://github.com/NordicSemiconductor/nrfx/archive
+
+CMSIS_UNPACK    := CMSIS_5
+CMSIS_VER       := 5.7.0
+CMSIS_REF       := $(CMSIS_VER)
+CMSIS_TGZ       := $(CMSIS_REF).tar.gz
+CMSIS_URL       := https://github.com/ARM-software/CMSIS_5/archive
+
+$(NRFXLIB_TGZ):
+       $(Q) echo "Downloading: NRFXLIB"
+       $(Q) curl -L $(NRFXLIB_URL)/$(NRFXLIB_TGZ) -o chip/$(NRFXLIB_TGZ)
+
+$(NRFX_TGZ):
+       $(Q) echo "Downloading: NRFX"
+       $(Q) curl -L $(NRFX_URL)/$(NRFX_TGZ) -o chip/$(NRFX_TGZ)
+
+$(CMSIS_TGZ):
+       $(Q) echo "Downloading: CMSIS"
+       $(Q) curl -L $(CMSIS_URL)/$(CMSIS_TGZ) -o chip/$(CMSIS_TGZ)
+
+chip/$(NRFXLIB_UNPACK): $(NRFXLIB_TGZ)
+       $(Q) echo "Unpacking: NRXFLIB"
+       $(Q) cd chip && tar zxf $(NRFXLIB_TGZ)
+       $(Q) mv chip/$(NRFXLIB_UNPACK)-$(NRFXLIB_VER)* chip/$(NRFXLIB_UNPACK)
+       $(Q) touch chip/$(NRFXLIB_UNPACK)
+
+chip/$(NRFX_UNPACK): $(NRFX_TGZ)
+       $(Q) echo "Unpacking: NRXF"
+       $(Q) cd chip && tar zxf $(NRFX_TGZ)
+       $(Q) mv chip/$(NRFX_UNPACK)-$(NRFX_VER)* chip/$(NRFX_UNPACK)
+       $(Q) touch chip/$(NRFX_UNPACK)
+
+chip/$(CMSIS_UNPACK): $(CMSIS_TGZ)

Review comment:
       I'm only talking about the interfaces that we need for this that should 
be a quite small surface. 




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