add bitbake build kernel

Signed-off-by: surenyi <surenyi82@163.com>

tex/openeuler.tex

@@ -518,4 +518,82 @@ SRC_URI[md5sum] = "491aeb15c1c72d59b9288a5a6953e8a9"
 SRC_URI[sha256sum] = "ad75a6ed3dc0d9732945b2e5483cb41dc8b4b528a169315e499c6861952e73b3"
 \end{minted}
 
+   \item {去除密码到期}
+\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
+   sudo chage -M -1 root
+\end{minted}
+
 \end{enumerate}
+
+\section{单独编译内核}
+用下面命令可以单独编译内核：
+\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
+oebuild bitbake -c clean -f -v virtual/kernel
+oebuild bitbake -c compile -f -v virtual/kernel
+oebuild bitbake -c deploy -f -v virtual/kernel
+\end{minted}
+
+编译完成后，进入 output/ 目录下文件目录，生成一个 boot.its 文件，内容如下：
+\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{devicetree}
+/dts-v1/;
+/ {
+    description = "FIT image with Linux kernel, FDT blob and resource";
+
+    images {
+        fdt {
+            data = /incbin/("../../tmp/deploy/images/sytc3588/rk3588-sytc.dtb");
+            type = "flat_dt";
+            arch = "arm64";
+            compression = "none";
+            load = <0xffffff00>;
+            description = "SYTC RK3588 A3101 Board";
+
+            hash {
+                algo = "sha256";
+            };
+        };
+
+        kernel {
+            data = /incbin/("Image.gz");
+            type = "kernel";
+            arch = "arm64";
+            os = "linux";
+            compression = "gzip";
+            entry = <0xffffff01>;
+            load = <0xffffff01>;
+            description = "Linux sytc3588 5.10.0-openeuler";
+
+            hash {
+                algo = "sha256";
+            };
+        };
+    };
+
+    configurations {
+        default = "conf";
+
+        conf {
+            rollback-index = <0x00>;
+            fdt = "fdt";
+            kernel = "kernel";
+            description = "A3101 with openEuler";
+
+            signature {
+                algo = "sha256,rsa2048";
+                padding = "pss";
+                key-name-hint = "dev";
+                sign-images = "fdt", "kernel";
+            };
+        };
+    };
+};
+\end{minted}
+
+
+执行下面命令，生成 boot.img 文件：
+\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
+gzip -9 Image
+mkimage -f boot.its -E -p 0x800 boot.img
+\end{minted}
+
+%\chapter{移植 OpenopenEuler Embedded}