undefined reference to `get_ticks

问题：
undefined reference to `get_ticks'
undefined reference to `get_tbclk'
undefined reference to `get_ticks'

解决：
diff --git a/arch/microblaze/cpu/timer.c b/arch/microblaze/cpu/timer.c
index a167755..1952804 100644
--- a/arch/microblaze/cpu/timer.c
+++ b/arch/microblaze/cpu/timer.c
@@ -62,3 +62,21 @@  int timer_init (void)
 }
 #endif
 #endif
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On Microblaze it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+ return get_timer(0);
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On Microblaze it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+ return CONFIG_SYS_HZ;
+}