diff --git a/Compile-lineage-os-19-kernel.md b/Compile-lineage-os-19-kernel.md
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+# prepare
+```
+mkdir -p ~/data/andriod
+mkdir -p ~/data/github/lineage-rpi
+cd ~/data/github/lineage-rpi
+
+git clone https://github.com/lineage-rpi/android_kernel_brcm_rpi -b lineage-19.1
+git clone https://github.com/lineage-rpi/proprietary_vendor_brcm -b lineage-19.1
+
+cd ~/data/andriod
+
+git clone https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9 -b pie-release
+```
+# fix firmware path
+
+edit `~/data/github/lineage-rpi/android_kernel_brcm_rpi/arch/arm64/configs/lineageos_rpi4_defconfig`
+to be
+**1537 CONFIG_EXTRA_FIRMWARE_DIR="/home/cpi/data/github/lineage-rpi/proprietary_vendor_brcm/rpi4/proprietary/vendor/firmware"**
+
+# compile
+
+```
+cd ~/data/github/lineage-rpi/android_kernel_brcm_rpi
+```
+
+create m.sh with content like:
+
+```
+#!/bin/bash
+
+export PATH=/home/cpi/data/andriod/aarch64-linux-android-4.9/bin:$PATH
+
+ARCH=arm64 CROSS_COMPILE=aarch64-linux-androidkernel- make lineageos_rpi4_defconfig
+ARCH=arm64 CROSS_COMPILE=aarch64-linux-androidkernel- make Image dtbs -j1
+```
+
+```
+chmod +x m.sh
+./m.sh # start kernel compile
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