diff --git a/os/common/ports/ARM/chcore.h b/os/common/ports/ARM/chcore.h
index 926fc1045..f8cd692f7 100644
--- a/os/common/ports/ARM/chcore.h
+++ b/os/common/ports/ARM/chcore.h
@@ -93,6 +93,8 @@
  */
 #define ARM_CORE_ARM7TDMI               7
 #define ARM_CORE_ARM9                   9
+#define ARM_CORE_CORTEX_A5              105
+#define ARM_CORE_CORTEX_A7              107
 #define ARM_CORE_CORTEX_A8              108
 #define ARM_CORE_CORTEX_A9              109
 /** @} */
@@ -147,6 +149,15 @@
 /* Derived constants and error checks.                                       */
 /*===========================================================================*/
 
+#if ARM_CORE < 100
+#define ARM_CORE_CLASSIC                1
+#define ARM_CORE_CORTEX_A               0
+#elif ARM_CORE < 200
+#define ARM_CORE_CLASSIC                0
+#define ARM_CORE_CORTEX_A               1
+#else
+#endif
+
 /* The following code is not processed when the file is included from an
    asm module.*/
 #if !defined(_FROM_ASM_)
@@ -162,6 +173,16 @@
 #define PORT_ARCHITECTURE_NAME          "ARMv5T"
 #define PORT_CORE_VARIANT_NAME          "ARM9"
 
+#elif ARM_CORE == ARM_CORE_CORTEX_A5
+#define PORT_ARCHITECTURE_ARM_CORTEXA5
+#define PORT_ARCHITECTURE_NAME          "ARMv7"
+#define PORT_CORE_VARIANT_NAME          "ARM Cortex-A5"
+
+#elif ARM_CORE == ARM_CORE_CORTEX_A7
+#define PORT_ARCHITECTURE_ARM_CORTEXA5
+#define PORT_ARCHITECTURE_NAME          "ARMv7"
+#define PORT_CORE_VARIANT_NAME          "ARM Cortex-A7"
+
 #elif ARM_CORE == ARM_CORE_CORTEX_A8
 #define PORT_ARCHITECTURE_ARM_CORTEXA8
 #define PORT_ARCHITECTURE_NAME          "ARMv7"
@@ -541,19 +562,14 @@ static inline void port_enable(void) {
  */
 static inline rtcnt_t port_rt_get_counter_value(void) {
 
-#if ((ARM_CORE == ARM_CORE_CORTEX_A5) || (ARM_CORE == ARM_CORE_CORTEX_A9) || defined(__DOXYGEN__))
-
+#if ARM_CORE_CORTEX_A
   rtcnt_t cyc;
 
   __asm volatile("mrc p15, 0, %[p0], c9, c13, 0" : [p0] "=r" (cyc) :);
 
   return cyc;
 #else
-/*
- * TODO develop same function for ARM_CORE_CORTEX_A8
- */
   return 0;
-
 #endif
 }