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113 lines
4.1 KiB
TeX
113 lines
4.1 KiB
TeX
The following section gives some tips and tricks on how to use efficiently
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OpenWrt on a regular basis and for daily work.
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\subsection{Compiling/recompiling components}
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The buildroot allows you to recompile the full environment or only parts of it
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like the toolchain, the kernel modules, the kernel or some packages.
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For instance if you want to recompile the toolchain after you made any change to it
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issue the following command:
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\begin{Verbatim}
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make toolchain/{clean,compile,install}
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\end{Verbatim}
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Which will clean, compile and install the toolchain. The command actually expands to the
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following:
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\begin{Verbatim}
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make[1] toolchain/clean
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make[2] -C toolchain/kernel-headers clean
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make[2] -C toolchain/binutils clean
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make[2] -C toolchain/gcc clean
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make[2] -C toolchain/uClibc clean (glibc or eglibc when chosen)
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\end{Verbatim}
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Of course, you could only choose to recompile one or several of the toolchain components
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(binutils, kernel-headers gcc, C library) individually.
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The exact same idea works for packages:
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\begin{Verbatim}
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make package/busybox/{clean,compile,install}
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\end{Verbatim}
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will clean, compile and install busybox (if selected to be installed on the final rootfs).
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Supposing that you made changes to the Linux kernel, but do not want to recompile everything,
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you can recompile only the kernel modules by issuing:
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\begin{Verbatim}
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make target/linux/compile
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\end{Verbatim}
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To recompile the static part of the kernel use the following command:
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\begin{Verbatim}
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make target/linux/install
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\end{Verbatim}
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\subsection{Using quilt inside OpenWrt}
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OpenWrt integrates quilt in order to ease the package, kernel and toolchain
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patches maintenance when migrating over new versions of the software.
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Quilt intends to replace an old workflow, where you would download the new
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source file, create an original copy of it, an a working copy, then try to
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apply by hand old patches and resolve conflicts manually. Additionnaly, using
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quilt allows you to update and fold patches into other patches easily.
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Quilt is used by default to apply Linux kernel patches, but not for the other
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components (toolchain and packages).
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\subsubsection{Using quilt with kernel patches}
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Assuming that you have everything setup for your new kernel version:
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\begin{itemize}
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\item \texttt{LINUX\_VERSION} set in the target Makefile
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\item config-2.6.x.y existing
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\item patches-2.6.x.y containing the previous patches
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\end{itemize}
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Some patches are likely to fail since the vanilla kernel we are patching
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received modifications so some hunks of the patches are no longer applying.
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We will use quilt to get them applying cleanly again. Follow this procedure
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whenever you want to upgrade the kernel using previous patches:
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\begin{enumerate}
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\item make target/linux/clean (removes the old version)
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\item make target/linux/compile (uncompress the kernel and try to apply patches)
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\item if patches failed to apply:
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\item cd build\_dir/linux-target/linux-2.6.x.y
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\item quilt push -a (to apply patches where quilt stopped)
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\item quilt push -f (to force applying patches)
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\item edit .rej files, apply the necessary changes to the files
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\item remove .rej files
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\item quilt refresh
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\item repeat operation 3 and following until all patches have been applied
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\item when all patches did apply cleanly: make target/linux/refresh
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\end{enumerate}
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Note that generic (target/linux/generic-2.6/linux-2.6.x/) patches can be found in
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\texttt{build\_dir/linux-target/linux-2.6.x.y/patches/generic} and platform specific
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patches in \texttt{build\_dir/linux-target/linux-2.6.x.y/patches/platform}.
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\subsubsection{Using quilt with packages}
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As we mentionned earlier, quilt is enabled by default for kernel patches, but not for
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packages. If you want to use quilt in the same way, you should set the QUILT environment
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variable to 1, e.g:
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\begin{Verbatim}
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make package/busybox/{clean,compile} QUILT=1
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\end{Verbatim}
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Will generate the patch series file and allow you to update patches just like we described
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before in the kernel case. Note that once all patches apply cleanly you should refresh them
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as well using the following command:
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\begin{Verbatim}
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make package/busybox/refresh QUILT=1
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\end{Verbatim}
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