cpu/kinetis: add support of MK20D7

cpu/kinetis/include/cpu_conf_kinetis.h

@@ -128,6 +128,19 @@ extern "C"
 #endif /* KINETIS_RNGA */
 /** @} */
 
+/**
+ * @name MK20D7 Compatibility layer
+ * @{
+ */
+#if defined(MK20D7_H_)
+#define LLWU_IRQn LLW_IRQn
+#define LPTMR0_IRQn LPTimer_IRQn
+#define PIT_TCTRL_CHN_MASK   (0x4u)
+#define PIT_TCTRL_CHN_SHIFT  (2)
+#endif /* MK20D7_H_ */
+/** @} */
+
+
 #ifdef __cplusplus
 }
 #endif

cpu/kinetis/include/cpu_conf_kinetis_k.h

@@ -70,6 +70,22 @@
     defined(CPU_MODEL_MK22FX512AVMD12)
 #include "vendor/MK22FA12.h"
 #endif
+#elif (KINETIS_SUBFAMILY == 0)
+#if defined(CPU_MODEL_MK20DX64VLH7) || \
+    defined(CPU_MODEL_MK20DX128VLH7) || \
+    defined(CPU_MODEL_MK20DX256VLH7) || \
+    defined(CPU_MODEL_MK20DX64VLK7) || \
+    defined(CPU_MODEL_MK20DX128VLK7) || \
+    defined(CPU_MODEL_MK20DX256VLK7) || \
+    defined(CPU_MODEL_MK20DX128VLL7) || \
+    defined(CPU_MODEL_MK20DX256VLL7) || \
+    defined(CPU_MODEL_MK20DX64VMB7) || \
+    defined(CPU_MODEL_MK20DX128VMB7) || \
+    defined(CPU_MODEL_MK20DX256VMB7) || \
+    defined(CPU_MODEL_MK20DX128VML7) || \
+    defined(CPU_MODEL_MK20DX256VML7)
+#include "vendor/MK20D7.h"
+#endif
 #endif /* (KINETIS_SUBFAMILY == y) */
 #elif (KINETIS_FAMILY == 6)
 #if (KINETIS_SUBFAMILY == 0)

cpu/kinetis/kinetis-info.mk

@@ -83,6 +83,8 @@ ifeq ($(KINETIS_SERIES),K)
       KINETIS_RAMSIZE = 48
     else ifeq ($(KINETIS_FAMILY)$(KINETIS_SUBFAMILY),24)
       KINETIS_RAMSIZE = 256
+    else ifeq ($(KINETIS_FAMILY)$(KINETIS_SUBFAMILY),20)
+      KINETIS_RAMSIZE = 64
     endif
   else ifeq ($(KINETIS_ROMSIZE),128)
     ifeq ($(KINETIS_FAMILY),0)