diff --git a/.cargo/config.toml b/.cargo/config.toml
index 19e61a1..3c4a4d6 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,6 +1,3 @@
 [build]
     target-dir = "build"
     target = "riscv64gc-unknown-none-elf"
-
-#[target.riscv64gc-unknown-none-elf]
-#    rustflags = ["-Clink-arg=-Tlinker.ld","--extern", "__alloc_error_handler=build/liballoc_error_handler.rlib"]
diff --git a/Cargo.lock b/Cargo.lock
index 08ac976..f27a7e2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -111,16 +111,6 @@ dependencies = [
  "runikraft",
 ]
 
-[[package]]
-name = "rkschedpreem"
-version = "0.1.0"
-dependencies = [
- "rkalloc",
- "rkplat",
- "rksched",
- "runikraft",
-]
-
 [[package]]
 name = "rksignal"
 version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index 0f40f5d..c6d1441 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,6 @@ members = [
     "lib/rkmbox",
     "lib/rksched",
     "lib/rkschedcoop",
-    "lib/rkschedpreem",
+    #"lib/rkschedpreem",
     "lib/rksignal",
 ]
diff --git a/lib/rkboot/src/lib.rs b/lib/rkboot/src/lib.rs
index 3b427f9..7d9a5f8 100644
--- a/lib/rkboot/src/lib.rs
+++ b/lib/rkboot/src/lib.rs
@@ -88,6 +88,7 @@ fn thread_main(arg: *mut u8) {
     bootstrap::halt();
 }
 
+#[cfg(feature="have_scheduler")]
 fn sched_start(arg: *mut u8) -> !{
     unsafe {
         (**(arg as *mut *mut dyn RKsched)).start();
diff --git a/lib/rklist/tests/list.rs b/lib/rklist/tests/list.rs
deleted file mode 100644
index 719b21e..0000000
--- a/lib/rklist/tests/list.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-// test rklist
-
-// TODO
\ No newline at end of file
diff --git a/lib/rkplat/Cargo.toml b/lib/rkplat/Cargo.toml
index daea18a..3555b84 100644
--- a/lib/rkplat/Cargo.toml
+++ b/lib/rkplat/Cargo.toml
@@ -12,7 +12,7 @@ authors = [
 ]
 
 [features]
-    default = ["has_smp","driver_ns16550","driver_virtio_all"]
+    default = ["has_smp","driver_ns16550","driver_virtio_all","driver_goldfish_rtc"]
     has_smp = []            # 对称多处理器支持
     save_fp = []            # 在线程切换时保存浮点寄存器
     driver_uart = []        # 串口设备驱动
@@ -24,6 +24,8 @@ authors = [
     driver_virtio_input = ["driver_virtio"]
     driver_virtio_net = ["driver_virtio"]
     driver_virtio_all = ["driver_virtio_blk","driver_virtio_console","driver_virtio_gpu","driver_virtio_input","driver_virtio_net"]
+    driver_rtc = []         # 真实时间时钟驱动
+    driver_goldfish_rtc = ["driver_rtc"]
     bios_io = []            # 使用BIOS输出
 
 [dependencies]
diff --git a/lib/rkplat/src/drivers/device_tree.rs b/lib/rkplat/src/drivers/device_tree.rs
index 048fbdd..20d9e5d 100644
--- a/lib/rkplat/src/drivers/device_tree.rs
+++ b/lib/rkplat/src/drivers/device_tree.rs
@@ -276,6 +276,13 @@ fn parse_device(a: &dyn RKalloc, name: &str, props: &[(&str,&[u8])], props_size:
                         prop_u32(props,props_size,"interrupts").unwrap() as usize)));
                 }
             },
+            #[cfg(feature="driver_goldfish_rtc")]
+            "google,goldfish-rtc" => {
+                unsafe {
+                    crate::time::RTC_DEVICE = Some(&*alloc_type(a, 
+                        super::rtc::goldfish::GoldfishRtc::new(name, prop_u64(props,props_size,"reg").unwrap() as usize)));
+                }
+            },
             #[cfg(feature="driver_virtio")]
             "virtio,mmio" => {
                 let header = unsafe {
diff --git a/lib/rkplat/src/drivers/mod.rs b/lib/rkplat/src/drivers/mod.rs
index 4b1b7f0..b9c9fa7 100644
--- a/lib/rkplat/src/drivers/mod.rs
+++ b/lib/rkplat/src/drivers/mod.rs
@@ -2,6 +2,8 @@
 pub mod uart;
 #[cfg(feature="driver_virtio")]
 pub mod virtio;
+#[cfg(feature="driver_rtc")]
+pub mod rtc;
 pub mod device_tree;
 
 pub type DriverIntHandler = fn();
diff --git a/lib/rkplat/src/drivers/rtc/goldfish.rs b/lib/rkplat/src/drivers/rtc/goldfish.rs
new file mode 100644
index 0000000..c7930f4
--- /dev/null
+++ b/lib/rkplat/src/drivers/rtc/goldfish.rs
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// goldfish.rs
+// Authors: 张子辰 <zichen350@gmail.com>
+// Copyright (C) 2022 吴骏东, 张子辰, 蓝俊玮, 郭耸霄 and 陈建绿.
+
+use super::{RtcDevice, super::Device};
+use core::{slice,str};
+use core::time::Duration;
+use crate::device::ioreg_read32;
+
+const TIME_LOW:  usize = 0x00;      // R: Get current time, then return low-order 32-bits.
+const TIME_HIGH: usize = 0x04;      // R: Return high 32-bits, from previous TIME_LOW read.
+
+pub struct GoldfishRtc {
+    addr: usize,
+    name: [u8;32],
+    name_size: usize,
+}
+
+impl GoldfishRtc {
+    pub fn new(name: &str, addr: usize) -> Self {
+        assert!(name.len()<=32);
+        let mut name1: [u8;32] = [0;32];
+        for i in 0..name.len() {
+            name1[i] = name.as_bytes()[i];
+        }
+        println_bios!("Init goldfish RTC device, name={},addr=0x{:x}.",name,addr);
+
+        Self {
+            addr,
+            name: name1,
+            name_size: name.len()
+        }
+    }
+
+    #[inline(always)]
+    fn reg(&self, r: usize) -> *mut u32{
+        (self.addr + r) as *mut u32
+    }
+
+    #[inline(always)]
+    fn reg_read(&self, r: usize) -> u32 {
+        unsafe{ioreg_read32(self.reg(r))}
+    }
+}
+
+impl Device for GoldfishRtc {
+    fn name<'a>(&'a self) -> &'a str {
+        unsafe {str::from_utf8_unchecked(slice::from_raw_parts(self.name.as_ptr(), self.name_size))}
+    }
+}
+
+impl RtcDevice for GoldfishRtc {
+    fn time(&self) -> Duration {
+        let mut high = self.reg_read(TIME_HIGH);
+        let mut low = self.reg_read(TIME_LOW);
+        let high2 = self.reg_read(TIME_HIGH);
+        if high2 != high {
+            low = self.reg_read(TIME_LOW);
+            high = high2;
+        }
+        Duration::from_nanos(((high as u64)<<32) + (low as u64))
+    }
+}
diff --git a/lib/rkplat/src/drivers/rtc/mod.rs b/lib/rkplat/src/drivers/rtc/mod.rs
new file mode 100644
index 0000000..b33d8f7
--- /dev/null
+++ b/lib/rkplat/src/drivers/rtc/mod.rs
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// rtc/mod.rs
+// Authors: 张子辰 <zichen350@gmail.com>
+// Copyright (C) 2022 吴骏东, 张子辰, 蓝俊玮, 郭耸霄 and 陈建绿.
+
+use super::Device;
+use core::time::Duration;
+
+pub trait RtcDevice: Device {
+    /// 获取系统时间（通常是UNIX时间）
+    fn time(&self) -> Duration;
+}
+
+#[cfg(feature="driver_goldfish_rtc")]
+pub mod goldfish;
diff --git a/lib/rkplat/src/drivers/uart/ns16550.rs b/lib/rkplat/src/drivers/uart/ns16550.rs
index acfaa5e..87b0f10 100644
--- a/lib/rkplat/src/drivers/uart/ns16550.rs
+++ b/lib/rkplat/src/drivers/uart/ns16550.rs
@@ -29,6 +29,8 @@
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.
 
+#![allow(dead_code)]
+
 use core::{str, slice};
 use super::UartDevice;
 use crate::drivers::Device;
@@ -38,16 +40,16 @@ use crate::lcpu::spinwait;
 const THR: usize = 0x00;
 const RBR: usize = 0x00;
 const IER: usize = 0x01;
-// const IIR: usize = 0x02;
+const IIR: usize = 0x02;
 const FCR: usize = 0x02;
 const LCR: usize = 0x03;
-// const MCR: usize = 0x04;
+const MCR: usize = 0x04;
 const LSR: usize = 0x05;
-// const MSR: usize = 0x06;
+const MSR: usize = 0x06;
 
 const REG_SHIFT: usize = 0x00;
 
-// const LCR_DLAB: u8    = 0x80;
+const LCR_DLAB: u8    = 0x80;
 const IER_INT_EN: u8  = 0x01;
 const FCR_FIFO_EN: u8 = 0x01;
 const LSR_RX_READY: u8 = 0x01;
@@ -55,7 +57,7 @@ const LSR_TX_VALID: u8 = 0x40;
 
 pub struct Ns16550 {
     addr: usize,  //地址
-    //irq: usize,     //中断号
+    irq: usize,     //中断号
     name: [u8;32],
     name_size: usize,
 }
@@ -70,7 +72,7 @@ impl Ns16550 {
         println_bios!("Init ns16550 device, name={},addr=0x{:x},irq={}.",name,addr,irq);
 
         Self {
-            addr,//irq,
+            addr,irq,
             name: name1,
             name_size: name.len()
         }.init()
diff --git a/lib/rkplat/src/riscv64/time.rs b/lib/rkplat/src/riscv64/time.rs
index 54dcfb3..d084126 100644
--- a/lib/rkplat/src/riscv64/time.rs
+++ b/lib/rkplat/src/riscv64/time.rs
@@ -4,8 +4,12 @@
 // Copyright (C) 2022 吴骏东, 张子辰, 蓝俊玮, 郭耸霄 and 陈建绿.
 
 use super::{lcpu,sbi};
+use core::time::Duration;
+#[cfg(feature="driver_rtc")]
+use crate::drivers::rtc::RtcDevice;
 
-pub type Duration = core::time::Duration;
+#[cfg(feature="driver_rtc")]
+pub(crate) static mut RTC_DEVICE: Option<&dyn RtcDevice> = None;
 
 /// 1秒
 pub const SEC: Duration = Duration::new(1, 0);
@@ -64,7 +68,14 @@ pub fn monotonic_clock() -> Duration {
 
 /// 获取UNIX时间
 pub fn wall_clock() -> Duration {
-    todo!("用rtc实现");
+    #[cfg(feature="driver_rtc")]
+    {
+        unsafe{RTC_DEVICE.unwrap().time()}
+    }
+    #[cfg(not(feature="driver_rtc"))]
+    {
+        unimplemented!("Feature `driver_rtc` is disabled.");
+    }
 }
 
 pub(crate) fn block(until: Duration) {
diff --git a/makefile b/makefile
index 417fc71..e2ac3f7 100644
--- a/makefile
+++ b/makefile
@@ -65,7 +65,7 @@ test: $(MAKE_ROOT_DIR)/test/makefile
 
 $(MAKE_ROOT_DIR)/test/makefile: makefiles/test.mk.sh makefiles/test.mk.0 makefiles/test.mk.1
 	-mkdir --parents $(MAKE_ROOT_DIR)/test
-	makefiles/test.mk.sh makefiles/test.mk $(MAKE_ROOT_DIR)/test/makefile
+	makefiles/test.mk.sh makefiles/test.mk $(MAKE_ROOT_DIR)/test/makefile $(TEST_ROOT_DIR)
 
 .PHONY: dev-test
 dev-test: $(RUST_OUTPUT_DIR)/dev-test.bin
diff --git a/makefiles/test.mk.1 b/makefiles/test.mk.1
index fb3659f..7aed966 100644
--- a/makefiles/test.mk.1
+++ b/makefiles/test.mk.1
@@ -1,14 +1,14 @@
 # -*- makefile -*-
 .PHONY: @testname@ @testname@.bin
 @testname@: @testname@.bin
-	qemu-system-riscv64 -machine virt -nographic -bios $$RISCV_BIOS -kernel alloc_buddy0.bin
+	qemu-system-riscv64 -machine virt -nographic -bios $$RISCV_BIOS -kernel @testname@.bin
 
 @testname@.bin: $(MAKE_ROOT_DIR)/liballoc_error_handler.rlib $(TEST_BUILD_DIR)/deps/liballoc_error_handler.rlib
 ifeq ($(MAKE_BUILD_TYPE), release)
-	cd $(TEST_ROOT_DIR)/@testname@ && env RUSTFLAGS="-Clink-arg=-T$(SRC_ROOT_DIR)/linker.ld --extern __alloc_error_handler=$(MAKE_ROOT_DIR)/liballoc_error_handler.rlib" cargo build --release --features rkalloc/__alloc_error_handler
+	cd $(TEST_ROOT_DIR)/@testname@ && env RUSTFLAGS="-Clink-arg=-T$(SRC_ROOT_DIR)/linker.ld --extern __alloc_error_handler=$(MAKE_ROOT_DIR)/liballoc_error_handler.rlib" cargo build --offline --release --features rkalloc/__alloc_error_handler
 else
 ifeq ($(MAKE_BUILD_TYPE), debug)
-	cd $(TEST_ROOT_DIR)/@testname@ && env RUSTFLAGS="-Clink-arg=-T$(SRC_ROOT_DIR)/linker.ld --extern __alloc_error_handler=$(MAKE_ROOT_DIR)/liballoc_error_handler.rlib" cargo build --features rkalloc/__alloc_error_handler
+	cd $(TEST_ROOT_DIR)/@testname@ && env RUSTFLAGS="-Clink-arg=-T$(SRC_ROOT_DIR)/linker.ld --extern __alloc_error_handler=$(MAKE_ROOT_DIR)/liballoc_error_handler.rlib" cargo build --offline --features rkalloc/__alloc_error_handler
 else
 	@echo "Unknown build type, expect release/debug."
 	false
diff --git a/makefiles/test.mk.sh b/makefiles/test.mk.sh
index 388a664..ba52278 100755
--- a/makefiles/test.mk.sh
+++ b/makefiles/test.mk.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-TEST_LIST='alloc_buddy0'
+TEST_LIST=$(ls -C $3)
 
 echo "# Generated by \`$0\` ." > $2
 
diff --git a/test/alloc_buddy0/.cargo/config.toml b/test/alloc_buddy0/.cargo/config.toml
index ec31dc7..81efcfc 100644
--- a/test/alloc_buddy0/.cargo/config.toml
+++ b/test/alloc_buddy0/.cargo/config.toml
@@ -1,6 +1,3 @@
 [build]
     target-dir = "../../build/test"
     target = "riscv64gc-unknown-none-elf"
-
-[target.riscv64gc-unknown-none-elf]
-    rustflags = ["-Clink-arg=-T../../linker.ld","--extern", "__alloc_error_handler=../../build/liballoc_error_handler.rlib"]
diff --git a/test/rkplat_time0/.cargo/config.toml b/test/rkplat_time0/.cargo/config.toml
new file mode 100644
index 0000000..81efcfc
--- /dev/null
+++ b/test/rkplat_time0/.cargo/config.toml
@@ -0,0 +1,3 @@
+[build]
+    target-dir = "../../build/test"
+    target = "riscv64gc-unknown-none-elf"
diff --git a/test/rkplat_time0/Cargo.toml b/test/rkplat_time0/Cargo.toml
new file mode 100644
index 0000000..0a3b6a3
--- /dev/null
+++ b/test/rkplat_time0/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+    name = "test-rkplat_time0"
+    version = "0.1.0"
+    edition = "2021"
+
+[workspace]
+
+[dependencies]
+    rkplat = {path = "../../lib/rkplat", default-features = false, features=["driver_ns16550","driver_goldfish_rtc"]}
+    rkalloc = {path = "../../lib/rkalloc"}
+    rkboot = {path = "../../lib/rkboot", default-features = false, features=["alloc_buddy"]}
diff --git a/test/rkplat_time0/src/main.rs b/test/rkplat_time0/src/main.rs
new file mode 100644
index 0000000..ccdf3fe
--- /dev/null
+++ b/test/rkplat_time0/src/main.rs
@@ -0,0 +1,17 @@
+#![no_std]
+#![no_main]
+
+extern crate rkboot;
+#[macro_use]
+extern crate rkplat;
+
+use rkplat::time::{wall_clock,monotonic_clock,get_ticks};
+
+#[no_mangle]
+fn main(_args: &mut [&str])->i32 {
+    let time1 = wall_clock();
+    let time2 = monotonic_clock();
+    let time3 = get_ticks();
+    println!("wall_clock()={:?}\nmonotonic_clock()={:?}\nget_ticks()={:?}",time1,time2,time3);
+    0
+}