diff --git a/.github/workflows/build-20210727.yml b/.github/workflows/build-20210727.yml
new file mode 100644
index 00000000..350b4237
--- /dev/null
+++ b/.github/workflows/build-20210727.yml
@@ -0,0 +1,96 @@
+name: Build CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '40 3 * * *'  # every day at 3:40
+
+jobs:
+  check:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2021-07-27
+          override: true
+          components: rust-src, rustfmt, clippy
+      - name: Check code format
+        run: cargo fmt --all -- --check
+      - name: Clippy LibOS
+        run: cargo clippy --all-features
+      - name: Clippy x86_64 bare-metal
+        run: cd zCore && make clippy ARCH=x86_64
+      - name: Clippy riscv64 bare-metal
+        run: cd zCore && make clippy ARCH=riscv64 LINUX=1
+
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, macos-latest]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2021-07-27
+          components: rust-src, llvm-tools-preview
+      - uses: actions-rs/install@v0.1
+        with:
+          crate: cargo-binutils
+          version: latest
+      - name: Build all packages
+        run: cargo build
+      - name: Build linux LibOS
+        run: cargo build --features "linux libos"
+      - name: Build zircon LibOS
+        run: cargo build --features "zircon libos"
+      - name: Build x86_64 bare-metal
+        run: cd zCore && make build ARCH=x86_64
+      - name: Build riscv64 bare-metal
+        run: cd zCore && make build ARCH=riscv64 LINUX=1
+
+  build-aarch64:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2021-07-27
+          override: true
+          target: aarch64-unknown-linux-gnu
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          use-cross: true
+          args: -p zircon-loader --target aarch64-unknown-linux-gnu --workspace --exclude linux-syscall --exclude linux-loader --exclude zcore
+
+  build-user:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, macos-latest]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Pull prebuilt images
+        run: git lfs pull -I prebuilt/zircon/x64/libc.so,prebuilt/zircon/x64/libfdio.so,prebuilt/zircon/x64/libunwind.so,prebuilt/zircon/x64/libzircon.so,prebuilt/zircon/x64/Scrt1.o
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2021-07-27
+          target: x86_64-fuchsia
+      - name: Build Zircon user programs
+        run: cd zircon-user && make build MODE=release
+
+  build-doc:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build docs
+        run: cargo doc --no-deps --all-features
diff --git a/.github/workflows/deploy.yml b/.github/workflows/docs.yml
similarity index 97%
rename from .github/workflows/deploy.yml
rename to .github/workflows/docs.yml
index 0bebf561..f4e5e7ff 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/docs.yml
@@ -1,4 +1,4 @@
-name: deploy CI
+name: Deploy docs
 
 on:
   push:
diff --git a/.github/workflows/rustc20210727.yml b/.github/workflows/test-20210727.yml
similarity index 58%
rename from .github/workflows/rustc20210727.yml
rename to .github/workflows/test-20210727.yml
index dca693b7..98595a30 100644
--- a/.github/workflows/rustc20210727.yml
+++ b/.github/workflows/test-20210727.yml
@@ -1,4 +1,4 @@
-name: current CI
+name: Test CI
 
 on:
   push:
@@ -7,90 +7,6 @@ on:
     - cron: '40 3 * * *'  # every day at 3:40
 
 jobs:
-  check:
-    runs-on: ubuntu-20.04
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly-2021-07-27
-          override: true
-          components: rust-src, rustfmt, clippy
-      - name: Check code format
-        uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all -- --check
-      - name: Clippy LibOS
-        run: cargo clippy --all-features
-      - name: Clippy x86_64 bare-metal
-        run: cd zCore && make clippy ARCH=x86_64
-      - name: Clippy riscv64 bare-metal
-        run: cd zCore && make clippy ARCH=riscv64 LINUX=1
-
-  build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-20.04, macos-latest]
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          submodules: 'recursive'
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly-2021-07-27
-          components: rust-src, llvm-tools-preview
-      - uses: actions-rs/install@v0.1
-        with:
-          crate: cargo-binutils
-          version: latest
-      - name: Build linux LibOS
-        run: cargo build --features "linux libos"
-      - name: Build zircon LibOS
-        run: cargo build --features "zircon libos"
-      - name: Build x86_64 bare-metal
-        run: cd zCore && make build ARCH=x86_64
-      - name: Build riscv64 bare-metal
-        run: cd zCore && make build ARCH=riscv64 LINUX=1
-
-  build-aarch64:
-    runs-on: ubuntu-20.04
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly-2021-07-27
-          override: true
-          target: aarch64-unknown-linux-gnu
-      - uses: actions-rs/cargo@v1
-        with:
-          command: build
-          use-cross: true
-          args: -p zircon-loader --target aarch64-unknown-linux-gnu
-
-  build-user:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-20.04, macos-latest]
-    steps:
-      - uses: actions/checkout@v2
-      - name: Pull prebuilt images
-        run: git lfs pull -I prebuilt/zircon/x64/libc.so,prebuilt/zircon/x64/libfdio.so,prebuilt/zircon/x64/libunwind.so,prebuilt/zircon/x64/libzircon.so,prebuilt/zircon/x64/Scrt1.o
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly-2021-07-27
-          target: x86_64-fuchsia
-      - name: Build Zircon user programs
-        run: |
-          cd zircon-user
-          make build MODE=release
-
   test:
     runs-on: ubuntu-20.04
     steps:
@@ -145,17 +61,14 @@ jobs:
           sudo apt update
           sudo apt install qemu-system-x86
       - name: Build zCore
-        run: |
-          cd zCore
-          make build MODE=release
-          cd ..
+        run: cd zCore && make build MODE=release
       - name: Run core-tests
         run: |
           cd scripts
-          pip3 install pexpect
+          pip3 install -r requirements.txt
           python3 core-tests.py
 
-  core-test-libos:
+  libos-core-test:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
@@ -166,13 +79,13 @@ jobs:
           profile: minimal
           toolchain: nightly-2021-07-27
           components: rust-src
-      - name: Run core-tests
+      - name: Run libos-core-tests
         run: |
           cd scripts
-          pip3 install pexpect
+          pip3 install -r requirements.txt
           python3 unix-core-tests.py
 
-  libc-test:
+  libos-libc-test:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
@@ -182,38 +95,13 @@ jobs:
         run: sudo apt-get install musl-tools musl-dev -y
       - name: Prepare rootfs and libc-test
         run: make rootfs && make libc-test
-      - name: Build
-        run: cargo build --release -p linux-loader
-#        uses: actions-rs/cargo@v1
-#        with:
-#          command: build
-#          args: --release -p linux-loader
-      - name: Run libc-tests
+      - name: Run libos-libc-tests
         run: |
           cd scripts
           pip3 install -r requirements.txt
-          python3 libc-tests.py
+          python3 libos-libc-tests.py
           cat linux/test-result.txt
 
-  doc:
-    runs-on: ubuntu-20.04
-    steps:
-      - uses: actions/checkout@v2
-      - name: Build docs
-        run: cargo doc --no-deps --all-features
-#        uses: actions-rs/cargo@v1
-#        with:
-#          command: doc
-#          args: --no-deps --all-features
-#      - name: Deploy to Github Pages
-#        if: ${{ github.ref == 'refs/heads/master' }}
-#        uses: JamesIves/github-pages-deploy-action@releases/v3
-#        with:
-#          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-#          BRANCH: gh-pages
-#          FOLDER: target/doc
-
-
   baremetal-libc-test:
     runs-on: ubuntu-20.04
     steps:
@@ -233,7 +121,7 @@ jobs:
           sudo apt-get install musl-tools musl-dev qemu-system-x86 -y
       - name: Prepare rootfs and libc-test
         run: make baremetal-test-img
-      - name: Build  kernel
+      - name: Build kernel
         run: cd zCore && make build MODE=release LINUX=1 ARCH=x86_64
       - name: create qemu disk
         run: cd zCore && make baremetal-qemu-disk MODE=release LINUX=1 ARCH=x86_64
@@ -241,6 +129,7 @@ jobs:
         run: |
           cd scripts
           python3 ./baremetal-libc-test.py
+
   baremetal-rv64-oscomp-test:
     runs-on: ubuntu-20.04
     steps:
@@ -266,7 +155,7 @@ jobs:
           tar xJf qemu-share.tar.xz && sudo cp -r qemu /usr/local/share/
       - name: Prepare rootfs and oscomp
         run: make riscv-image
-      - name: Build  kernel
+      - name: Build kernel
         run: cd zCore && make build MODE=release LINUX=1 ARCH=riscv64
       - name: Run baremetal-libc-test
         run: |
diff --git a/kernel-hal/Cargo.toml b/kernel-hal/Cargo.toml
index 85d2f258..cd378684 100644
--- a/kernel-hal/Cargo.toml
+++ b/kernel-hal/Cargo.toml
@@ -8,8 +8,9 @@ description = "Kernel HAL interface definations."
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
+default = ["libos"]
 smp = []
-libos = ["async-std", "bitmap-allocator", "zcore-drivers/mock"]
+libos = ["nix", "tempfile", "async-std", "bitmap-allocator", "zcore-drivers/mock"]
 graphic = ["zcore-drivers/graphic"]
 
 [dependencies]
@@ -25,8 +26,8 @@ zcore-drivers = { path = "../drivers", features = ["virtio"] }
 
 # LibOS mode
 [target.'cfg(not(target_os = "none"))'.dependencies]
-nix = "0.23"
-tempfile = "3"
+nix = { version = "0.23", optional = true }
+tempfile = { version = "3", optional = true }
 async-std = { version = "1.10", optional = true }
 bitmap-allocator = { git = "https://github.com/rcore-os/bitmap-allocator", rev = "b3f9f51", optional = true }
 
diff --git a/linux-loader/Cargo.toml b/linux-loader/Cargo.toml
index 83930a0b..c8984c76 100644
--- a/linux-loader/Cargo.toml
+++ b/linux-loader/Cargo.toml
@@ -12,7 +12,7 @@ log = "0.4"
 linux-syscall = { path = "../linux-syscall" }
 linux-object = { path = "../linux-object" }
 zircon-object = { path = "../zircon-object" }
-kernel-hal = { path = "../kernel-hal" }
+kernel-hal = { path = "../kernel-hal", default-features = false }
 
 [features]
 default = ["libos"]
diff --git a/linux-object/Cargo.toml b/linux-object/Cargo.toml
index 503fac5f..9b9a2774 100644
--- a/linux-object/Cargo.toml
+++ b/linux-object/Cargo.toml
@@ -16,7 +16,7 @@ bitflags = "1.3"
 hashbrown = "0.9"
 numeric-enum-macro = "0.2"
 zircon-object = { path = "../zircon-object", features = ["elf"] }
-kernel-hal = { path = "../kernel-hal" }
+kernel-hal = { path = "../kernel-hal", default-features = false }
 downcast-rs = { version = "1.2", default-features = false }
 lazy_static = { version = "1.4", features = ["spin_no_std"] }
 rcore-fs = { git = "https://github.com/rcore-os/rcore-fs", rev = "7c232ec" }
diff --git a/linux-object/src/loader/abi.rs b/linux-object/src/loader/abi.rs
index b7d1a914..39ef0a00 100644
--- a/linux-object/src/loader/abi.rs
+++ b/linux-object/src/loader/abi.rs
@@ -1,5 +1,6 @@
 //! Process init info
 #![allow(unsafe_code)]
+#![allow(dead_code)]
 
 use alloc::collections::btree_map::BTreeMap;
 use alloc::string::String;
diff --git a/linux-syscall/Cargo.toml b/linux-syscall/Cargo.toml
index 5d6de81a..4a5fad9a 100644
--- a/linux-syscall/Cargo.toml
+++ b/linux-syscall/Cargo.toml
@@ -14,7 +14,7 @@ bitflags = "1.3"
 numeric-enum-macro = "0.2"
 zircon-object = { path = "../zircon-object" }
 linux-object = { path = "../linux-object" }
-kernel-hal = { path = "../kernel-hal" }
+kernel-hal = { path = "../kernel-hal", default-features = false }
 rcore-fs = { git = "https://github.com/rcore-os/rcore-fs", rev = "7c232ec" }
 lazy_static = { version = "1.4", features = ["spin_no_std"] }
 bitvec = { version = "0.22", default-features = false, features = ["alloc"] }
diff --git a/linux-syscall/src/lib.rs b/linux-syscall/src/lib.rs
index 474b17ff..08044505 100644
--- a/linux-syscall/src/lib.rs
+++ b/linux-syscall/src/lib.rs
@@ -7,9 +7,9 @@
 //! let args = [regs.rdi, regs.rsi, regs.rdx, regs.r10, regs.r8, regs.r9];
 //! let mut syscall = Syscall {
 //!     thread,
-//!     #[cfg(feature = "std")]
+//!     #[cfg(feature = "libos")]
 //!     syscall_entry: kernel_hal::context::syscall_entry as usize,
-//!     #[cfg(not(feature = "std"))]
+//!     #[cfg(not(feature = "libos"))]
 //!     syscall_entry: 0,
 //!     thread_fn,
 //!     regs,
diff --git a/scripts/libc-tests.py b/scripts/libos-libc-tests.py
similarity index 96%
rename from scripts/libc-tests.py
rename to scripts/libos-libc-tests.py
index 0284e1cd..f11de12b 100755
--- a/scripts/libc-tests.py
+++ b/scripts/libos-libc-tests.py
@@ -25,7 +25,7 @@ def print_cases(cases, file=None):
         print(case, file=file)
 
 
-subprocess.run("cd .. && cargo build -p zcore --release --features 'linux libos'",
+subprocess.run("cargo build -p zcore --release --features 'linux libos'",
                shell=True, check=True)
 
 for path in sorted(glob.glob("../rootfs/libc-test/src/*/*.exe")):
diff --git a/scripts/requirements.txt b/scripts/requirements.txt
index f08cca14..516bbf2f 100644
--- a/scripts/requirements.txt
+++ b/scripts/requirements.txt
@@ -1 +1,2 @@
+pexpect
 termcolor
diff --git a/scripts/unix-core-testone.py b/scripts/unix-core-testone.py
index cbead18a..12898e88 100644
--- a/scripts/unix-core-testone.py
+++ b/scripts/unix-core-testone.py
@@ -12,7 +12,7 @@ parser = argparse.ArgumentParser()
 parser.add_argument('testcase', nargs=1)
 args = parser.parse_args()
 
-child = pexpect.spawn("cargo run -p zcore --features 'zircon libos' -- '%s' '%s'" %
+child = pexpect.spawn("cargo run -p zcore --release --features 'zircon libos' -- '%s' '%s'" %
                         (ZBI_PATH, CMDLINE_BASE+args.testcase[0]),
                         timeout=TIMEOUT, encoding='utf-8')
 
diff --git a/scripts/unix-core-tests.py b/scripts/unix-core-tests.py
index bf90b9c8..f95a4448 100644
--- a/scripts/unix-core-tests.py
+++ b/scripts/unix-core-tests.py
@@ -2,6 +2,7 @@ import pexpect
 import sys
 import re
 import os
+import subprocess
 
 TIMEOUT = 300
 ZIRCON_LOADER_PATH = 'zircon-loader'
@@ -40,9 +41,11 @@ with open(TEST_CASE_EXCEPTION, "r") as tcf:
     exception_case = set([case.strip() for case in tcf.readlines()])
 check_case = all_case - exception_case
 
+subprocess.run("cargo build -p zcore --release --features 'zircon libos'",
+               shell=True, check=True)
+
 for line in check_case:
-    child = pexpect.spawn("cargo run -p zcore --features 'zircon libos' -- '%s' '%s'" %
-                    (ZBI_PATH, CMDLINE_BASE+line),
+    child = pexpect.spawn("../target/release/zcore", [ZBI_PATH, CMDLINE_BASE+line],
                     timeout=TIMEOUT, encoding='utf-8')
 
     child.logfile = Tee(OUTPUT_FILE, 'a')
diff --git a/zCore/Cargo.toml b/zCore/Cargo.toml
index 7851d250..4fbc9f3e 100644
--- a/zCore/Cargo.toml
+++ b/zCore/Cargo.toml
@@ -15,18 +15,18 @@ bench = false
 doc = false
 
 [features]
-default = ["color_log"]
-color_log = []
+default = ["libos"]
+colorless-log = []
 graphic = ["kernel-hal/graphic"]
-init_ram_disk = []
-link_user_img = ["init_ram_disk"]
+init-ram-disk = []
+link-user-img = ["init-ram-disk"]
 
 zircon = ["zircon-loader"]
 linux = ["linux-loader", "linux-object", "rcore-fs", "rcore-fs-sfs"]
 
-libos = ["async-std", "chrono", "rcore-fs-hostfs", "linux-loader/libos", "zircon-loader/libos"]
-board_qemu = []
-board_d1 = ["link_user_img"]
+libos = ["async-std", "chrono", "rcore-fs-hostfs", "kernel-hal/libos", "linux-loader/libos", "zircon-loader/libos"]
+board-qemu = []
+board-d1 = ["link-user-img"]
 
 [dependencies]
 log = "0.4"
@@ -34,7 +34,7 @@ spin = "0.9"
 cfg-if = "1.0"
 lazy_static = { version = "1.4", features = ["spin_no_std" ] }
 bitmap-allocator = { git = "https://github.com/rcore-os/bitmap-allocator", rev = "b3f9f51" }
-kernel-hal = { path = "../kernel-hal", features = ["smp"] }
+kernel-hal = { path = "../kernel-hal", default-features = false, features = ["smp"] }
 zircon-object = { path = "../zircon-object" }
 linux-object = { path = "../linux-object", optional = true }
 zircon-loader = { path = "../zircon-loader", default-features = false, optional = true }
diff --git a/zCore/Makefile b/zCore/Makefile
index 7e8dcc7c..c0b264a5 100644
--- a/zCore/Makefile
+++ b/zCore/Makefile
@@ -80,12 +80,12 @@ ifeq ($(LIBOS), 1)
   features += libos
 else
   ifeq ($(ARCH), x86_64)
-    features += init_ram_disk
+    features += init-ram-disk
   else ifeq ($(ARCH), riscv64)
     ifeq ($(PLATFORM), d1)
-      features += board_d1 link_user_img
+      features += board-d1 link-user-img
     else
-      features += board_qemu
+      features += board-qemu
     endif
   endif
 endif
@@ -106,7 +106,7 @@ endif
 build_args := --features "$(features)"
 
 ifneq ($(LIBOS), 1) # no_std
-  build_args += --target $(ARCH).json -Z build-std=core,alloc -Z build-std-features=compiler-builtins-mem
+  build_args += --no-default-features --target $(ARCH).json -Z build-std=core,alloc -Z build-std-features=compiler-builtins-mem
 endif
 
 ifeq ($(MODE), release)
diff --git a/zCore/src/fs.rs b/zCore/src/fs.rs
index e972aea9..b116407b 100644
--- a/zCore/src/fs.rs
+++ b/zCore/src/fs.rs
@@ -1,6 +1,6 @@
 #[allow(dead_code)]
 fn init_ram_disk() -> &'static mut [u8] {
-    if cfg!(feature = "link_user_img") {
+    if cfg!(feature = "link-user-img") {
         extern "C" {
             fn _user_img_start();
             fn _user_img_end();
@@ -36,7 +36,7 @@ cfg_if! {
             use linux_object::fs::rcore_fs_wrapper::{Block, BlockCache, MemBuf};
             use rcore_fs::dev::Device;
 
-            let device: Arc<dyn Device> = if cfg!(feature = "init_ram_disk") {
+            let device: Arc<dyn Device> = if cfg!(feature = "init-ram-disk") {
                 Arc::new(MemBuf::new(init_ram_disk()))
             } else {
                 let block = kernel_hal::drivers::all_block().first_unwrap();
@@ -66,7 +66,7 @@ cfg_if! {
 
 // Hard link rootfs img
 #[cfg(not(feature = "libos"))]
-#[cfg(feature = "link_user_img")]
+#[cfg(feature = "link-user-img")]
 global_asm!(concat!(
     r#"
     .section .data.img
diff --git a/zCore/src/logging.rs b/zCore/src/logging.rs
index 808f473d..a3f115b9 100644
--- a/zCore/src/logging.rs
+++ b/zCore/src/logging.rs
@@ -52,10 +52,10 @@ enum ColorCode {
 /// Add escape sequence to print with color in Linux console
 macro_rules! with_color {
     ($color_code:expr, $($arg:tt)*) => {{
-        #[cfg(feature = "color_log")]
+        #[cfg(feature = "colorless-log")]
+        { let _ = $color_code; format_args!($($arg)*) }
+        #[cfg(not(feature = "colorless-log"))]
         { format_args!("\u{1B}[{}m{}\u{1B}[m", $color_code as u8, format_args!($($arg)*)) }
-        #[cfg(not(feature = "color_log"))]
-        { format_args!($($arg)*) }
     }};
 }
 
diff --git a/zCore/src/memory.rs b/zCore/src/memory.rs
index c4029a95..99720fa8 100644
--- a/zCore/src/memory.rs
+++ b/zCore/src/memory.rs
@@ -14,6 +14,9 @@ type FrameAlloc = bitmap_allocator::BitAlloc16M; // max 64G
 #[cfg(target_arch = "riscv64")]
 type FrameAlloc = bitmap_allocator::BitAlloc1M; // max 4G
 
+#[cfg(target_arch = "aarch64")]
+type FrameAlloc = bitmap_allocator::BitAlloc1M; // max 4G
+
 const PAGE_SIZE: usize = 4096;
 
 /// Global physical frame allocator
diff --git a/zCore/src/platform/mod.rs b/zCore/src/platform/mod.rs
index ab375085..81d470c4 100644
--- a/zCore/src/platform/mod.rs
+++ b/zCore/src/platform/mod.rs
@@ -1,5 +1,5 @@
 cfg_if! {
-    if #[cfg(not(target_os = "none"))] {
+    if #[cfg(feature = "libos")] {
         #[path = "libos/entry.rs"]
         mod entry;
         #[path = "libos/consts.rs"]
diff --git a/zCore/src/platform/riscv/consts.rs b/zCore/src/platform/riscv/consts.rs
index 098ed875..3fe058b6 100644
--- a/zCore/src/platform/riscv/consts.rs
+++ b/zCore/src/platform/riscv/consts.rs
@@ -1,11 +1,11 @@
 // RISCV
 
 cfg_if! {
-    if #[cfg(feature = "board_qemu")] {
+    if #[cfg(feature = "board-qemu")] {
         pub const KERNEL_OFFSET: usize = 0xFFFF_FFFF_8000_0000;
         pub const PHYS_MEMORY_BASE: usize = 0x8000_0000;
         pub const PHYS_MEMORY_END: usize = 0x8800_0000; // TODO: get memory end from device tree
-    } else if #[cfg(feature = "board_d1")] {
+    } else if #[cfg(feature = "board-d1")] {
         pub const KERNEL_OFFSET: usize = 0xFFFF_FFFF_C000_0000;
         pub const PHYS_MEMORY_BASE: usize = 0x4000_0000;
         pub const PHYS_MEMORY_END: usize = 0x6000_0000; // 512M
diff --git a/zCore/src/platform/riscv/entry.rs b/zCore/src/platform/riscv/entry.rs
index 5b2ff60e..53b87c54 100644
--- a/zCore/src/platform/riscv/entry.rs
+++ b/zCore/src/platform/riscv/entry.rs
@@ -1,6 +1,6 @@
-#[cfg(feature = "board_qemu")]
+#[cfg(feature = "board-qemu")]
 global_asm!(include_str!("boot/boot_qemu.asm"));
-#[cfg(feature = "board_d1")]
+#[cfg(feature = "board-d1")]
 global_asm!(include_str!("boot/boot_d1.asm"));
 
 global_asm!(include_str!("boot/entry64.asm"));
diff --git a/zircon-loader/Cargo.toml b/zircon-loader/Cargo.toml
index 68ed0d69..afab5c20 100644
--- a/zircon-loader/Cargo.toml
+++ b/zircon-loader/Cargo.toml
@@ -13,11 +13,11 @@ cfg-if = "1.0"
 xmas-elf = "0.7"
 zircon-object = { path = "../zircon-object", features = ["elf"] }
 zircon-syscall = { path = "../zircon-syscall" }
-kernel-hal = { path = "../kernel-hal" }
+kernel-hal = { path = "../kernel-hal", default-features = false }
 
 [features]
 default = ["libos"]
-libos = ["kernel-hal/libos", "zircon-object/aspace-separate", "zircon-syscall/std"]
+libos = ["kernel-hal/libos", "zircon-object/aspace-separate", "zircon-syscall/libos"]
 
 [dev-dependencies]
 env_logger = "0.9"
diff --git a/zircon-object/Cargo.toml b/zircon-object/Cargo.toml
index 69197fbc..79a841cd 100644
--- a/zircon-object/Cargo.toml
+++ b/zircon-object/Cargo.toml
@@ -18,7 +18,7 @@ spin = "0.9"
 log = "0.4"
 hashbrown = "0.9"
 downcast-rs = { version = "1.2", default-features = false }
-kernel-hal = { path = "../kernel-hal" }
+kernel-hal = { path = "../kernel-hal", default-features = false }
 numeric-enum-macro = "0.2"
 futures = { version = "0.3", default-features = false, features = ["alloc", "async-await"] }
 xmas-elf = { version = "0.7", optional = true }
diff --git a/zircon-syscall/Cargo.toml b/zircon-syscall/Cargo.toml
index 7e942997..17cfea01 100644
--- a/zircon-syscall/Cargo.toml
+++ b/zircon-syscall/Cargo.toml
@@ -11,8 +11,7 @@ description = "Zircon syscalls implementation"
 # hypervisor = ["zircon-object/hypervisor"]
 default = []
 deny-page-fault = []
-std = ["deny-page-fault"]
-
+libos = ["deny-page-fault", "kernel-hal/libos"]
 
 [dependencies]
 log = "0.4"
@@ -20,6 +19,6 @@ spin = "0.9"
 bitflags = "1.3"
 numeric-enum-macro = "0.2"
 zircon-object = { path = "../zircon-object" }
-kernel-hal = { path = "../kernel-hal" }
+kernel-hal = { path = "../kernel-hal", default-features = false }
 futures = { version = "0.3", default-features = false, features = ["alloc", "async-await"] }
 cfg-if = "1.0"