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56 lines
1.8 KiB
56 lines
1.8 KiB
\chapter{文件更新}
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\section{MMC 分区}
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默认情况下，MMC 的分区如下表所示：
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\begin{table}[H]
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\centering
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\begin{tabular}{ccll}
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\toprule
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起始 (扇区) & 大小 (字节) & 分区名 & 程序\\
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\midrule
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\texttt{0x0000000} & \texttt{4M} & \texttt{loader} &\texttt{MiniLoaderAll.bin} \\
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\texttt{0x0002000} & \texttt{1M} & \texttt{bootenv} & \texttt{uboot 环境变量} \\
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\texttt{0x0004000} & \texttt{8M} & \texttt{uboot} & \texttt{uboot.img} \\
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\texttt{0x0008000} & \texttt{80M} & \texttt{boot} & \texttt{boot.img} \\
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\texttt{0x0030000} & \texttt{14G} & \texttt{rootfs} & \texttt{rootfs.img} \\
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\texttt{0x1c30000} & \texttt{-} & \texttt{userdata}& \texttt{userdata.img}\\
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\bottomrule
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\end{tabular}
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\caption{MMC 分区表}
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\end{table}
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这里一个扇区的大小是 512 字节。
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\section{U-Boot 网络升级}
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开机时在调试串口上按住 \zhsquote{CTRL-C}，串口打印将停止在 U-Boot 的命令行上。
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\subsection{升级 uboot}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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tftpflash 20000000 uboot.img uboot
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\end{minted}
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如果下载失败，请检查网线是否接在 CPU 直出的网口上面。
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\subsection{升级 boot}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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tftpflash 20000000 boot.img boot
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\end{minted}
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如果下载失败，请检查网线是否接在 CPU 直出的网口上面。
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\subsection{升级 rootfs}
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\begin{minted}[bgcolor=lightgray!30,fontsize=\scriptsize]{bash}
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tftpflash 20000000 rootfs.img rootfs
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\end{minted}
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注意：rootfs 文件比较大，uboot 下可用的内存 3GB 左右，文件先下到内存会放不下而失败。
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\begin{comment}
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\chapter {系统默认配置}
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\section{默认 IP 地址}
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eth0: 192.168.1.80
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eth1: 192.168.2.80
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\section{系统密码}
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root 密码: root
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\end{comment}
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