RT #72064. Implemented reset_cpu() for STM32. Moved reset_cpu() and

 cortex_m3_irq_vec_get() from platform-specific cpu.c to the common CM3 code.
 However, a platform can implement their own reset_cpu().

cpu/arm_cortexm3/a2f/cpu.c

@@ -52,21 +52,6 @@ void __attribute__((section(".ramcode")))
 		__attribute__ ((long_call))
 		reset_cpu(ulong addr)
 {
-	volatile struct cm3_scb *scb = (volatile struct cm3_scb *)CM3_SCB_BASE;
-	/*
-	 * Perform reset but keep priority group unchanged.
-	 */
-	scb->aircr  = (CM3_AIRCR_VECTKEY << CM3_AIRCR_VECTKEY_SHIFT) |
-			  (scb->aircr &
-			  (CM3_AIRCR_PRIGROUP_MSK << CM3_AIRCR_PRIGROUP_SHIFT)) |
-			  CM3_AIRCR_SYSRESET;
+	cortex_m3_reset_cpu(addr);
 }
 
-/*
- * Dump the registers on an exception we don't know how to process.
- */
-unsigned char cortex_m3_irq_vec_get(void)
-{
-	volatile struct cm3_scb *scb = (volatile struct cm3_scb *)CM3_SCB_BASE;
-	return scb->icsr & CM3_ICSR_VECTACT_MSK;
-}

cpu/arm_cortexm3/cpu.c

@@ -89,3 +89,32 @@ void hw_watchdog_reset(void)
 	wdt_strobe();
 }
 #endif
+
+/*
+ * Perform the low-level reset.
+ * Note that we need for this function to reside in RAM since it
+ * can be used to self-upgrade U-boot in eNMV.
+ */
+void __attribute__((section(".ramcode")))
+		__attribute__ ((long_call))
+		cortex_m3_reset_cpu(ulong addr)
+{
+	volatile struct cm3_scb *scb = (volatile struct cm3_scb *)CM3_SCB_BASE;
+	/*
+	 * Perform reset but keep priority group unchanged.
+	 */
+	scb->aircr  = (CM3_AIRCR_VECTKEY << CM3_AIRCR_VECTKEY_SHIFT) |
+			  (scb->aircr &
+			  (CM3_AIRCR_PRIGROUP_MSK << CM3_AIRCR_PRIGROUP_SHIFT)) |
+			  CM3_AIRCR_SYSRESET;
+
+}
+
+/*
+ * Dump the registers on an exception we don't know how to process.
+ */
+unsigned char cortex_m3_irq_vec_get(void)
+{
+	volatile struct cm3_scb *scb = (volatile struct cm3_scb *)CM3_SCB_BASE;
+	return scb->icsr & CM3_ICSR_VECTACT_MSK;
+}

cpu/arm_cortexm3/stm32f2/cpu.c

@@ -52,21 +52,5 @@ void __attribute__((section(".ramcode")))
 		__attribute__ ((long_call))
 		reset_cpu(ulong addr)
 {
-	/*
-	 * TBD
-	 */
-
-	return;
-}
-
-/*
- * Dump the registers on an exception we don't know how to process.
- */
-unsigned char cortex_m3_irq_vec_get(void)
-{
-	/*
-	 * TBD
-	 */
-
-	return 0;
+	cortex_m3_reset_cpu(addr);
 }

include/asm-arm/arch-cortexm3/hardware.h

@@ -59,4 +59,8 @@ struct cm3_systick {
 #define CM3_SYSTICK_LOAD_RELOAD_MSK	(0x00FFFFFF)
 #define CM3_SYSTICK_CTRL_EN		1
 
+void __attribute__((section(".ramcode"))) __attribute__ ((long_call))
+cortex_m3_reset_cpu(ulong addr);
+unsigned char cortex_m3_irq_vec_get(void);
+
 #endif