diff --git a/.ci/autorun.sh b/.ci/autorun.sh
index d07494b..6df16cd 100755
--- a/.ci/autorun.sh
+++ b/.ci/autorun.sh
@@ -16,8 +16,18 @@ function ASSERT {
 
 cleanup
 
+# macOS needs more time to boot compared to Linux, so the timeout is set to
+# 600 seconds for macOS to handle the longer startup. For Linux, 90 seconds
+# is sufficient due to its faster boot process.
+UNAME_S=$(uname -s)
+if [[ ${UNAME_S} == "Darwin" ]]; then
+    TIMEOUT=600
+else # Linux
+    TIMEOUT=90
+fi
+
 ASSERT expect <<DONE
-set timeout 90
+set timeout ${TIMEOUT}
 spawn make check
 expect "buildroot login:" { send "root\n" } timeout { exit 1 }
 expect "# " { send "uname -a\n" } timeout { exit 2 }
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 627525b..7fbdcb4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -3,14 +3,27 @@ name: CI
 on: [push, pull_request]
 
 jobs:
-  rv32emu:
+  semu-linux:
     runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v4
     - name: install-dependencies
-      run: | 
-            sudo apt-get install build-essential device-tree-compiler
-            sudo apt-get install expect
+      run: |
+            sudo apt-get install build-essential device-tree-compiler expect
+    - name: default build
+      run: make
+      shell: bash
+    - name: automated test
+      run: .ci/autorun.sh
+      shell: bash
+
+  semu-macOS:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: install-dependencies
+      run: |
+            brew install make dtc expect e2fsprogs
     - name: default build
       run: make
       shell: bash
diff --git a/mk/external.mk b/mk/external.mk
index 65499b4..0ec803a 100644
--- a/mk/external.mk
+++ b/mk/external.mk
@@ -19,9 +19,9 @@ define download
 $($(T)_DATA):
 	$(VECHO) "  GET\t$$@\n"
 	$(Q)curl --progress-bar -O -L -C - "$(strip $($(T)_DATA_URL))"
-	$(Q)echo "$(strip $$($(T)_DATA_SHA1)) $$@.bz2" | $(SHA1SUM) -c
+	$(Q)echo "$(strip $$($(T)_DATA_SHA1))  $$@.bz2" | $(SHA1SUM) -c
 	$(Q)bunzip2 $$@.bz2
 endef
 
 EXTERNAL_DATA = KERNEL INITRD
-$(foreach T,$(EXTERNAL_DATA),$(eval $(download))) 
+$(foreach T,$(EXTERNAL_DATA),$(eval $(download)))