diff --git a/device/raspberry/pi4b/config b/device/raspberry/pi4b/config
index b2cddf1..ee3d865 100644
--- a/device/raspberry/pi4b/config
+++ b/device/raspberry/pi4b/config
@@ -1,14 +1,19 @@
 ARCH="aarch64"
+
 KERNEL="https://github.com/raspberrypi/linux.git#rpi-6.6.y"
 KERNEL_CONFIG="bcm2711_defconfig"
 KERNEL_EXTRACONFIG="--module NTFS3_FS --enable NTFS3_LZX_XPRESS --enable NTFS3_FS_POSIX_ACL --disable NTFS3_64BIT_CLUSTER"
 DTB="broadcom/bcm2711-rpi-4-b"
+
 CMDLINE="dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait"
 NEED_INITRD=no
 
+# disk section
 # /boot is vfat partition
 BOOT_FSTYPE="vfat"
 BOOT_SIZE="256MB"
 # / is ext4 partition
 ROOT_FSTYPE="ext4"
 ROOT_SIZE="1024MB"
+
+PRESET_CONFIG="local_config"
diff --git a/utils/generate_spec.py b/utils/generate_spec.py
new file mode 100644
index 0000000..b196eb5
--- /dev/null
+++ b/utils/generate_spec.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import os
+import sys
+from common import load_config
+
+def get_kernel_version(kernel_url, branch):
+    """Extract kernel version from kernel URL and branch"""
+    return branch
+
+def generate_spec_file(vendor, device):
+    """Generate RPM spec file from template and config"""
+    # Load device config
+    config_path = os.path.join("device", vendor, device, "config")
+    if not os.path.exists(config_path):
+        print(f"Error: Config file not found at {config_path}")
+        sys.exit(1)
+
+    config = load_config(config_path)
+
+    # Load template
+    template_path = os.path.join("utils", "kernel.template")
+    if not os.path.exists(template_path):
+        print(f"Error: Template file not found at {template_path}")
+        sys.exit(1)
+
+    with open(template_path, 'r') as f:
+        template = f.read()
+
+    # Extract kernel version from kernel URL and branch
+    kernel_url, kernel_branch = config["KERNEL"].split("#")
+    kernel_version = get_kernel_version(kernel_url, kernel_branch)
+
+    # Determine KERNEL_ARCH and CROSS_COMPILE based on ARCH
+    arch = config.get("ARCH", "unknown")
+    kernel_config = config.get("KERNEL_CONFIG", "unknown")
+    if arch == "aarch64":
+        kernel_arch = "arm64"
+        cross_compile = "aarch64-linux-gnu"
+    else:
+        kernel_arch = arch
+        cross_compile = f"{arch}-linux-gnu"  # Default cross compile format
+
+    # Prepare replacements
+    device_name = f"{vendor}-{device}"
+    replacements = {
+        "{BOARD_NAME}": device_name,
+        "{KERNEL_VERSION}": kernel_version,
+        "{DEVICE_NAME}": device_name,
+        "{KERNEL_ARCH}": kernel_arch,
+        "{ARCH}": arch,  # Add ARCH replacement
+        "{KERNEL_CONFIG}": kernel_config,  # Add ARCH replacement
+        "{CROSS_COMPILE}": cross_compile  # Add CROSS_COMPILE replacement
+    }
+
+    # Apply replacements
+    spec_content = template
+    for key, value in replacements.items():
+        spec_content = spec_content.replace(key, value)
+
+    # Define output directory and path
+    output_dir = os.path.join("tmp", vendor, device, "kernel-build")
+    os.makedirs(output_dir, exist_ok=True)
+
+    # Write spec file
+    spec_file_path = os.path.join(output_dir, f"kernel-{device_name}.spec")
+    with open(spec_file_path, 'w') as f:
+        f.write(spec_content)
+
+    print(f"Generated spec file: {spec_file_path}")
+    return spec_file_path
+
+if __name__ == "__main__":
+    if len(sys.argv) != 3:
+        print("Usage: generate_spec.py <vendor> <device>")
+        sys.exit(1)
+
+    vendor = sys.argv[1]
+    device = sys.argv[2]
+
+    generate_spec_file(vendor, device)
+
diff --git a/utils/kernel.template b/utils/kernel.template
new file mode 100644
index 0000000..ca8893d
--- /dev/null
+++ b/utils/kernel.template
@@ -0,0 +1,41 @@
+%define debug_package %{nil}
+%define _modulesdir     /usr/lib/modules
+
+Name:           kernel-{BOARD_NAME}
+Version:        {KERNEL_VERSION}
+Release:        1
+Summary:        kernel for {BOARD_NAME} devices
+Group:          System/Kernel and hardware
+Source0:        kernel.tar
+Source1:        {KERNEL_CONFIG}
+License:        GPLv2
+Provides:       kernel = %{EVRD}
+
+%description
+kernel for ${BOARD_NAME}
+
+%prep
+%autosetup -p1 -n kernel
+cp %{S:1} .config
+grep -Irl /lib/modules | xargs sed -i -e 's,/lib/modules,%{_modulesdir},g' -e 's,/usr/usr/lib/modules,/usr/lib/modules,g'
+
+%build
+%make_build CROSS_COMPILE=/usr/bin/{ARCH}-linux-gnu- ARCH={KERNEL_ARCH}
+
+%install
+# Install kernel modules, if any
+make V=1 modules_install ARCH={KERNEL_ARCH} \
+  INSTALL_MOD_PATH=%{buildroot} \
+  INSTALL_DTBS_PATH=%{buildroot}/boot
+
+make dtbs_install ARCH={KERNEL_ARCH} \
+  INSTALL_MOD_PATH=%{buildroot} \
+  INSTALL_DTBS_PATH=%{buildroot}/boot
+
+cp arch/arm64/boot/Image %{buildroot}/boot/vmlinuz-%{version}
+
+find %{buildroot} -type f -name "*.ko" -exec %{_bindir}/{ARCH}-linux-gnu-strip {} \;
+
+%files
+/boot/*
+/usr/lib/modules/*