Add board k210-emulator

arch/risc-v/k210/boot.S

@@ -49,7 +49,9 @@ _begin:
   li t0, MSTATUS_FS
   csrs mstatus, t0
 
+#ifndef BSP_USING_QEMU
   ZERO_F_REGISTERS
+#endif
 
 .option push
 .option norelax

arch/risc-v/k210/tick.c

@@ -42,10 +42,15 @@ int InitHwTick(void)
 
     CLEAR_CSR(mie, MIP_MTIP);
 
+#ifdef BSP_USING_QEMU
+    tick_cycles = (10000000 / TICK_PER_SECOND);
+#else
     tick_cycles = interval * SysctlClockGetFreq(SYSCTL_CLOCK_CPU) / CLINT_CLOCK_DIV / 1000ULL - 1;
+#endif
+  
     clint->mtimecmp[core_id] = clint->mtime + tick_cycles;
 
     SET_CSR(mie, MIP_MTIP);
 
     return 0;
-}
+}