diff --git a/ext/hal/ti/simplelink/Kbuild b/ext/hal/ti/simplelink/Kbuild
index fdb5fa0..f5a107c 100644
--- a/ext/hal/ti/simplelink/Kbuild
+++ b/ext/hal/ti/simplelink/Kbuild
@@ -1,5 +1,37 @@
 ccflags-$(CONFIG_HAS_CC3220SDK) += -D$(COMPILER)
-# Need to build prcm and utils for PRCMCC3220MCUInit, which is not in ROM
+# Need to build prcm, utils and pin, which are not in ROM
 obj-$(CONFIG_HAS_CC3220SDK) += source/ti/devices/cc32xx/driverlib/utils.o
 obj-$(CONFIG_HAS_CC3220SDK) += source/ti/devices/cc32xx/driverlib/prcm.o
 obj-$(CONFIG_HAS_CC3220SDK) += source/ti/devices/cc32xx/driverlib/pin.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/SPI.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/spi/SPICC32XXDMA.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/dma/UDMACC32XX.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/power/PowerCC32XX.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/utils/List.o
+CFLAGS_driver.o += -D__LINUX_ERRNO_EXTENSIONS__
+# driver.c warns on strict-aliasing
+CFLAGS_driver.o += -Wno-strict-aliasing
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/driver.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/device.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/flowcont.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/fs.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/netapp.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/netcfg.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/netutil.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/nonos.o
+# sl_socket warns on missing braces:
+CFLAGS_sl_socket.o += -Wno-missing-braces
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/sl_socket.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/spawn.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/wlan.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/porting/CC3220SF_LAUNCHXL.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/porting/cc_pal.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/eventreg.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/drivers/net/wifi/source/socket.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/devices/cc32xx/driverlib/timer.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += source/ti/devices/cc32xx/driverlib/udma.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += kernel/zephyr/dpl/dpl.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += kernel/zephyr/dpl/MutexP_zephyr.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += kernel/zephyr/dpl/SemaphoreP_zephyr.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += kernel/zephyr/dpl/ClockP_zephyr.o
+obj-$(CONFIG_SIMPLELINK_HOST_DRIVER) += kernel/zephyr/dpl/HwiP_zephyr.o
diff --git a/ext/hal/ti/simplelink/Kconfig b/ext/hal/ti/simplelink/Kconfig
index a7d7943..362b9aa 100644
--- a/ext/hal/ti/simplelink/Kconfig
+++ b/ext/hal/ti/simplelink/Kconfig
@@ -3,9 +3,15 @@
 config HAS_CC3220SDK
 	bool
 
-menuconfig CC3220SDK
-	bool "TI CC3220 SDK support"
+# Notes:
+# SimpleLink drivers require types (stdint.h) from NEWLIB_LIBC
+# Selecting ERRNO lets host driver use Zephyr's __errno
+config SIMPLELINK_HOST_DRIVER
+	bool "Build the SimpleLink WiFi Host Driver"
 	default n
 	depends on HAS_CC3220SDK
+	depends on MULTITHREADING
+	depends on NEWLIB_LIBC
+	select ERRNO
 	help
-	Build required peripheral driverlib files from the CC3220 SDK
+	Build the SimpleLink host driver
diff --git a/ext/hal/ti/simplelink/Makefile b/ext/hal/ti/simplelink/Makefile
index 6dc111f..a3c94eb 100644
--- a/ext/hal/ti/simplelink/Makefile
+++ b/ext/hal/ti/simplelink/Makefile
@@ -4,3 +4,9 @@
 ZEPHYRINCLUDE +=-I$(srctree)/ext/hal/ti/simplelink/source/ti/devices/cc32xx/driverlib
 KBUILD_CFLAGS += -DUSE_CC3220_ROM_DRV_API
 endif # CONFIG_HAS_CC3220SDK
+ifdef CONFIG_SIMPLELINK_HOST_DRIVER
+ZEPHYRINCLUDE +=-I$(srctree)/ext/hal/ti/simplelink/source
+ZEPHYRINCLUDE +=-I$(srctree)/ext/hal/ti/simplelink/kernel/zephyr/dpl
+KBUILD_CFLAGS += -DSL_SUPPORT_IPV6
+KBUILD_CFLAGS += -DSL_PLATFORM_MULTI_THREADED
+endif # CONFIG_SIMPLELINK_HOST_DRIVER
diff --git a/ext/hal/ti/simplelink/README b/ext/hal/ti/simplelink/README
index bc44e3d..2f8e2cf 100644
--- a/ext/hal/ti/simplelink/README
+++ b/ext/hal/ti/simplelink/README
@@ -35,3 +35,7 @@
 - driverlib/pin.c
 - driverlib/utils.c
 - driverlib/prcm.c
+
+Setting CONFIG_SIMPLELINK_HOST_DRIVER=y builds the SimpleLink Host
+Driver, which communicates over dedicated SPI to the
+network coprocessor.
diff --git a/ext/hal/ti/simplelink/source/ti/drivers/net/wifi/porting/user.h b/ext/hal/ti/simplelink/source/ti/drivers/net/wifi/porting/user.h
index 35b99bf..a7222ec 100644
--- a/ext/hal/ti/simplelink/source/ti/drivers/net/wifi/porting/user.h
+++ b/ext/hal/ti/simplelink/source/ti/drivers/net/wifi/porting/user.h
@@ -174,7 +174,9 @@
                 (Once errno has been read, the driver assumes it can be allocated to another thread).
 */
 
+/* Zephyr Port: use Zephyr's errno mechanism:
 #define SL_INC_INTERNAL_ERRNO
+*/
 
 /*!
     \brief      Defines whether to include extended API in SimpleLink driver
@@ -686,7 +688,19 @@
     \warning
 */
 #ifndef SL_INC_INTERNAL_ERRNO
-#define slcb_SetErrno
+/*
+ * Zephyr Port: use Zephyr SDK's errno.h definitions, and supply those missing
+ * to allow the SimpleLink driver.c to compile
+ * Also, supply the external errno setter function.
+ */
+#include <errno.h>
+#define ERROR  EIO
+#define INEXE  EALREADY
+#define ENSOCK ENFILE
+
+#include <dpl.h>
+#define slcb_SetErrno dpl_set_errno
+
 #endif
 
 /*!