asp.net scan barcode android Compiling the Kernel from Source Code in Software

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Compiling the Kernel from Source Code
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Instead of installing already compiled binary versions of the kernel for Red Hat, you can install the kernel source code on your system and use it to create the kernel binary files yourself. Kernel source code files are compiled with the gcc compiler just as any other source code files are. One advantage to compiling the kernel is you are able to customize its configuration, selecting particular devices you want supported by the kernel or the kind of networking support you want. You can have more control over exactly what your operating system can support. The 2.4 kernel is described here.
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Installing Kernel Sources: Kernel Archives and Patches
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You can obtain a recent version of the kernel source code from Red Hat. It will have the name kernel-source. The kernel-source file is usually installed as part of your installation. New versions can be downloaded with the Red Hat Update Agent, or by directly accessing the Red Hat FTP site. Be sure to download both the kernel headers and the source code RPM files. As noted previously, you simply install them as you would any RPM package.
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# rpm -Uvh kernel-headers-2.4.7-10.i386.rpm # rpm -Uvh kernel-source-2.4.7-10.i386.rpm
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The source files are placed in the /usr/src directory, within the subdirectory that will have the prefix linux and a suffix consisting of the kernel version, as in linux-2.4.7 for kernel 2.4, release 2, patch 7. The full directory will be /usr/src/linux-2.4.7. When you download and install a new kernel, a separate subdirectory will be created for it. For example, the 2.4.7-10 kernel will be placed in /usr/src/linux-2.4.3. A link is created called /usr/src/linux-2.4 that will link to the most recent kernel source directory that you installed. You can use this link to access your most recent kernel source. Originally, this would link to /usr/src/linux-2.4.7. If you later installed the 2.4.7-10 kernel, this would link to /usr/src/linux2.4.3. You can also obtain the most recent version of the source code from www.kernel.org. These versions are normally much more recent that those available on Red Hat, but may not have been thoroughly tested on the Red Hat platform. The kernel source will be in the form of compressed archives (.tar.gz). They will have the prefix linux with the version name as the suffix. For example, linux-2.4.6 is the 2.4 kernel, revision 6. You first decompress and extract the archive with the following commands. vnum is the version number. First you change to the /usr/src directory and then unpack the archive. It will create a directory called linux where the source files are placed. The following example extracts the 2.4.6 kernel:
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cd /usr/src gzip cd linux-2.4.6.tar.gz | tar xvf -
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Be sure to unpack it in the /usr/src directory. The archive extracts a directory named linux that holds the source code files. This way, the files are located in the /usr/src/ linux directory. Once you have extracted your kernel source, you should download and apply any patches. A patch modifies a source code file, making required changes. To install a patch, download the patch file and then execute the following command. The patch file is first decompressed, and then the patch command implements the changes.
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cd /usr/src
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gzip -cd patchvnum.gz | patch -p0
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You can also decompress the patch and then redirect it to the patch command. patch reads its patches from the standard input.
gunzip patch-2.4.6.gz patch -p0 < patch-2.4.6
You may have to implement several patches, depending on how out-of-date your kernel is. In this case, you must execute a patch operation for each patch file needed. Patches need to be applied in sequence. The latest patch does not include any previous ones. So to apply patch 2.4.7, you would first have to apply patch 2.4.1. Or, you can use the patch-kernel script, which determines your kernel version and applies the patches needed.
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