diff --git a/.gitignore b/.gitignore
index b7b91e95..ba8ec73a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,4 @@
 os/target/*
 os/.idea/*
 os/src/link_app.S
-user/
+os/Cargo.lock
diff --git a/bootloader/rustsbi-k210.bin b/bootloader/rustsbi-k210.bin
index 5a9fa7d1..e696137a 100755
Binary files a/bootloader/rustsbi-k210.bin and b/bootloader/rustsbi-k210.bin differ
diff --git a/bootloader/rustsbi-qemu.bin b/bootloader/rustsbi-qemu.bin
index 72742c20..5ccab433 100755
Binary files a/bootloader/rustsbi-qemu.bin and b/bootloader/rustsbi-qemu.bin differ
diff --git a/os/Cargo.lock b/os/Cargo.lock
deleted file mode 100644
index b85588b1..00000000
--- a/os/Cargo.lock
+++ /dev/null
@@ -1,5 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-[[package]]
-name = "os"
-version = "0.1.0"
diff --git a/os/Makefile b/os/Makefile
index ed60f63c..90a87a54 100644
--- a/os/Makefile
+++ b/os/Makefile
@@ -3,13 +3,20 @@ TARGET := riscv64gc-unknown-none-elf
 MODE := release
 KERNEL_ELF := target/$(TARGET)/$(MODE)/os
 KERNEL_BIN := $(KERNEL_ELF).bin
-KERNEL_ENTRY_PA := 0x80020000
 DISASM_TMP := target/$(TARGET)/$(MODE)/asm
 
 # BOARD
 BOARD ?= qemu
 SBI ?= rustsbi
 BOOTLOADER := ../bootloader/$(SBI)-$(BOARD).bin
+K210_BOOTLOADER_SIZE := 131072
+
+# KERNEL ENTRY
+ifeq ($(BOARD), qemu)
+	KERNEL_ENTRY_PA := 0x80200000
+else ifeq ($(BOARD), k210)
+	KERNEL_ENTRY_PA := 0x80020000
+endif
 
 # Run K210
 K210-SERIALPORT	= /dev/ttyUSB0
@@ -34,7 +41,10 @@ $(KERNEL_BIN): kernel
 	@$(OBJCOPY) $(KERNEL_ELF) --strip-all -O binary $@
 
 kernel:
+	@echo Platform: $(BOARD)
+	@cp src/linker-$(BOARD).ld src/linker.ld
 	@cargo build --release
+	@rm src/linker.ld
 
 clean:
 	@cargo clean
@@ -58,7 +68,7 @@ ifeq ($(BOARD),qemu)
 		-device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA)
 else
 	@cp $(BOOTLOADER) $(BOOTLOADER).copy
-	@dd if=$(KERNEL_BIN) of=$(BOOTLOADER).copy bs=131072 seek=1
+	@dd if=$(KERNEL_BIN) of=$(BOOTLOADER).copy bs=$(K210_BOOTLOADER_SIZE) seek=1
 	@mv $(BOOTLOADER).copy $(KERNEL_BIN)
 	@sudo chmod 777 $(K210-SERIALPORT)
 	python3 $(K210-BURNER) -p $(K210-SERIALPORT) -b 1500000 $(KERNEL_BIN)
diff --git a/os/src/linker.ld b/os/src/linker-k210.ld
similarity index 100%
rename from os/src/linker.ld
rename to os/src/linker-k210.ld
diff --git a/os/src/linker-qemu.ld b/os/src/linker-qemu.ld
new file mode 100644
index 00000000..8348a385
--- /dev/null
+++ b/os/src/linker-qemu.ld
@@ -0,0 +1,45 @@
+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+BASE_ADDRESS = 0x80200000;
+
+SECTIONS
+{
+    . = BASE_ADDRESS;
+    skernel = .;
+
+    stext = .;
+    .text : {
+        *(.text.entry)
+        *(.text .text.*)
+    }
+
+    . = ALIGN(4K);
+    etext = .;
+    srodata = .;
+    .rodata : {
+        *(.rodata .rodata.*)
+    }
+
+    . = ALIGN(4K);
+    erodata = .;
+    sdata = .;
+    .data : {
+        *(.data .data.*)
+    }
+
+    . = ALIGN(4K);
+    edata = .;
+    .bss : {
+        *(.bss.stack)
+        sbss = .;
+        *(.bss .bss.*)
+    }
+
+    . = ALIGN(4K);
+    ebss = .;
+    ekernel = .;
+
+    /DISCARD/ : {
+        *(.eh_frame)
+    }
+}
\ No newline at end of file