diff --git a/README.md b/README.md
index ba04bfb..9017fc5 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ In fact, it's more complicated than we expected to write an OS starting from scr
 
 ### Environment
 
-* Rust toolchain at nightly-2018-08-03
+* Rust toolchain at nightly-2018-09-03
 *  `cargo-xbuild`
 * `QEMU` >= 2.12.0
 * riscv32
@@ -37,6 +37,7 @@ In fact, it's more complicated than we expected to write an OS starting from scr
 ```bash
 git clone https://github.com/wangrunji0408/RustOS.git --recursive
 cd RustOS/kernel
+rustup override set nightly-2018-09-03
 make run arch=riscv32|x86_64
 # For FPGA: 
 # make run arch=riscv32 board=1
diff --git a/crate/riscv b/crate/riscv
index ed6e4c5..50d2008 160000
--- a/crate/riscv
+++ b/crate/riscv
@@ -1 +1 @@
-Subproject commit ed6e4c5b935d9d027303da829a7508c105df3139
+Subproject commit 50d2008d7579e24fc4f29889b73831acdd9aa830
diff --git a/kernel/Cargo.lock b/kernel/Cargo.lock
index aa2c4c1..3c65055 100644
--- a/kernel/Cargo.lock
+++ b/kernel/Cargo.lock
@@ -1,6 +1,6 @@
 [[package]]
 name = "bare-metal"
-version = "0.1.2"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -26,25 +26,26 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bitflags"
-version = "1.0.3"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cc"
-version = "1.0.18"
+version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "1.0.2"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "spin 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spin 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -52,15 +53,15 @@ name = "linked_list_allocator"
 version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "spin 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spin 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "log"
-version = "0.4.3"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -68,7 +69,7 @@ name = "multiboot2"
 version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -88,11 +89,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "riscv"
-version = "0.2.0"
+version = "0.3.0"
 dependencies = [
- "bare-metal 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bare-metal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "bit_field 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -106,7 +107,7 @@ dependencies = [
 
 [[package]]
 name = "spin"
-version = "0.4.8"
+version = "0.4.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -119,7 +120,7 @@ name = "uart_16550"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "x86_64 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -130,17 +131,17 @@ dependencies = [
  "bbl 0.1.0",
  "bit-allocator 0.1.0",
  "bit_field 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "linked_list_allocator 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "multiboot2 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "once 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "riscv 0.2.0",
+ "riscv 0.3.0",
  "simple-filesystem 0.0.1 (git+https://github.com/wangrunji0408/SimpleFileSystem-Rust)",
- "spin 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spin 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "uart_16550 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ucore-memory 0.1.0",
  "ucore-process 0.1.0",
@@ -157,7 +158,7 @@ version = "0.1.0"
 name = "ucore-process"
 version = "0.1.0"
 dependencies = [
- "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -170,6 +171,11 @@ name = "ux"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "version_check"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "volatile"
 version = "0.1.0"
@@ -181,7 +187,7 @@ version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bit_field 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "os_bootinfo 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "usize_conversions 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ux 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -201,25 +207,26 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
-"checksum bare-metal 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "eda0f54b2d49f18f3867a5e6d458299bb886db6e64c34d319d6b1aa0839ac31c"
+"checksum bare-metal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1bdcf9294ed648c7cd29b11db06ea244005aeef50ae8f605b1a3af2940bf8f92"
 "checksum bit-vec 0.5.0 (git+https://github.com/AltSysrq/bit-vec.git)" = "<none>"
 "checksum bit_field 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ed8765909f9009617974ab6b7d332625b320b33c326b1e9321382ef1999b5d56"
-"checksum bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d0c54bb8f454c567f21197eefcdbf5679d0bd99f2ddbe52e84c77061952e6789"
-"checksum cc 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)" = "2119ea4867bd2b8ed3aecab467709720b2d55b1bcfe09f772fd68066eaf15275"
-"checksum cfg-if 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "efe5c877e17a9c717a0bf3613b2709f723202c4e4675cc8f12926ded29bcb17e"
-"checksum lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "fb497c35d362b6a331cfd94956a07fc2c78a4604cdbee844a81170386b996dd3"
+"checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
+"checksum cc 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)" = "c37f0efaa4b9b001fa6f02d4b644dee4af97d3414df07c51e3e4f015f3a3e131"
+"checksum cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0c4e7bb64a8ebb0d856483e1e682ea3422f883c5f5615a90d51a2c82fe87fdd3"
+"checksum lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca488b89a5657b0a2ecd45b95609b3e848cf1755da332a0da46e2b2b1cb371a7"
 "checksum linked_list_allocator 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "655d57c71827fe0891ce72231b6aa5e14033dae3f604609e6a6f807267c1678d"
-"checksum log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "61bd98ae7f7b754bc53dca7d44b604f733c6bba044ea6f41bc8d89272d8161d2"
+"checksum log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "d4fcce5fa49cc693c312001daf1d13411c4a5283796bac1084299ea3e567113f"
 "checksum multiboot2 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6ebbe89ab663a65cab341428d5fc7013b0eab5543ace92a401a86581e50fdd81"
 "checksum once 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "931fb7a4cf34610cf6cbe58d52a8ca5ef4c726d4e2e178abd0dc13a6551c6d73"
 "checksum os_bootinfo 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "66481dbeb5e773e7bd85b63cd6042c30786f834338288c5ec4f3742673db360a"
 "checksum redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "c214e91d3ecf43e9a4e41e578973adeb14b474f2bee858742d127af75a0112b1"
 "checksum simple-filesystem 0.0.1 (git+https://github.com/wangrunji0408/SimpleFileSystem-Rust)" = "<none>"
-"checksum spin 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "14db77c5b914df6d6173dda9a3b3f5937bd802934fa5edaf934df06a3491e56f"
+"checksum spin 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)" = "37b5646825922b96b5d7d676b5bb3458a54498e96ed7b0ce09dc43a07038fea4"
 "checksum static_assertions 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c19be23126415861cb3a23e501d34a708f7f9b2183c5252d690941c2e69199d5"
 "checksum uart_16550 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "269f953d8de3226f7c065c589c7b4a3e83d10a419c7c3b5e2e0f197e6acc966e"
 "checksum usize_conversions 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f70329e2cbe45d6c97a5112daad40c34cd9a4e18edb5a2a18fefeb584d8d25e5"
 "checksum ux 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "53d8df5dd8d07fedccd202de1887d94481fadaea3db70479f459e8163a1fab41"
+"checksum version_check 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7716c242968ee87e5542f8021178248f267f295a5c4803beae8b8b7fd9bc6051"
 "checksum volatile 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "37c5d76c0f40ba4f8ac10ec4717d4e98ce3e58c5607eea36e9464226fc5e0a95"
 "checksum x86_64 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "466c2002e38edde7ebbaae6656793d4f71596634971c7e8cbf7afa4827968445"
 "checksum xmas-elf 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "22678df5df766e8d1e5d609da69f0c3132d794edf6ab5e75e7abcd2270d4cf58"
diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
index 0dc49f7..6b615a9 100644
--- a/kernel/Cargo.toml
+++ b/kernel/Cargo.toml
@@ -21,7 +21,7 @@ debug = true
 
 [dependencies]
 log = "0.4"
-spin = "0.4.8"
+spin = "0.4.9"
 once = "0.3.3"
 xmas-elf = "0.6"
 bitflags = "1.0"
diff --git a/kernel/Makefile b/kernel/Makefile
index 1213feb..770d88c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -120,11 +120,11 @@ build/x86_64/os.iso: $(kernel) $(grub_cfg)
 	@rm -r build/isofiles
 
 build/riscv32/os.iso: kernel
+	@mkdir -p build/riscv32
 	@cp $(rust_lib) $(kernel)
 ifdef board
 	@cp $(rust_lib) $@
 else
-	@mkdir -p build/riscv32
 	@cd ../riscv-pk && \
 	 mkdir -p build && \
 	 cd build && \
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index b24d93a..a129cc0 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -2,8 +2,6 @@
 #![feature(lang_items)]
 #![feature(const_fn)]
 #![feature(alloc)]
-#![feature(const_unique_new, const_atomic_usize_new)]
-#![feature(unique)]
 #![feature(allocator_api)]
 #![feature(abi_x86_interrupt)]
 #![feature(iterator_step_by)]
diff --git a/macOS-env/README.md b/macOS-env/README.md
index 658c902..06fff74 100644
--- a/macOS-env/README.md
+++ b/macOS-env/README.md
@@ -1,5 +1,10 @@
 # MacOS environment
 
+``` bash
+brew tap altkatz/homebrew-gcc_cross_compilers
+brew install x64-elf-gcc
+```
+
 * x86_64_elf_*:
     <https://github.com/altkatz/homebrew-gcc_cross_compilers>