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Remember, a general-purpose Linux distribution doesn t know what devices will be on the machine, so the kernel has a minimal set of drivers statically linked and then uses modules, which are dynamically linked, to get the remaining drivers. This minimal set of drivers is enough to drive a display and mount a few file systems likely to be available on most hardware platforms. The work involved in looking at the current hardware configuration and loading the drivers also takes time during the boot process. Many embedded devices don t have much time before they re up and running, so the time overhead alone may disqualify the use of kernel modules. For devices that do use kernel modules, building the modules is a straightforward task. The prior section showed how to build a kernel for a PowerPC 405-based board; using that same kernel directory, you build the modules with the following command: $ make modules ARCH=powerpc CROSS_COMPILE=powerpc-405-linux-gnu(clipped) CC [M] drivers/of/of_i2c.o CC [M] drivers/video/fbmem.o CC [M] drivers/video/fbmon.o CC [M] drivers/video/fbcmap.o (clipped) The output shows that the process is busy building modules (by way of the [M]). The output of a kernel module build is some number of files ending in .ko that are scattered across the kernel s source tree. After they re compiled, the modules can be gathered into one location via an installation target in the kernel s make file. Installing the modules for an embedded system means gathering the .ko files in the kernel source tree and putting them in a directory. That directory s contents are then moved to the target device. You do this by using the modules_install target as follows:

Figure 10-11. Hard light is an easy and fast way to bring out color in an image that has no bright areas. The left half of the image is the original; the right half has been self-composited with Hard light.

If you need to record what a user says, such as in a voice confirmation or a voicemail system, you can use either the RecordMessage or the RecordAudio activities. The RecordAudio activity simply records the user and stores the recording. The RecordMessage activity records the user but then allows the user to listen and revise the recording.

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$ make modules_install ARCH=powerpc INSTALL_MOD_PATH=/path/to/rfs Replace the directory /path/to/rfs with the directory containing the RFS for the target board. The installation process copies the files into the directory /path/to/rfs/lib/modules/< kernel version >. If space is a concern, you can remove the kernel modules that won t be used on the target device before this directory is included in the board s root file system. Kernel modules aren t atomic, which means a kernel module may need another in order to work correctly. This data is stored in the modules.dep file under the $INSTALL_MOD_PATH/lib/modules/< kernel version > directory. A typical entry looks like the following: kernel/drivers/mtd/mtdblock.ko: kernel/drivers/mtd/mtd_blkdevs.ko This line says that the mkdblock.ko module depends on the mtd_blkdevs.ko module. Looking at the mtd_blkdevs.ko file shows that no further dependencies exist. Dependency information is close in format to what you find in a make file, so it s easy for a human to read. This information tells you that you need both of these files on the target system if you want to use the features offered by the mtdblock.ko module. This is very helpful when you re removing kernel modules that aren t necessary in order to conserve space. It s important to note that only the kernel module file (.ko) is necessary to load a module. The additional files, like modules.deps, are a convenience. All you need to load a module on a system is the insmod program, which loads the module into the kernel, and the module itself. However, if your system will be loading arbitrary modules or storage space isn t a concern, you can include all the module files in the target s file system.

I live near a major city, and it s frequently smoggy or hazy. When I try to take long-distance shots with my camera, I m often disappointed: objects that seemed perfectly clear to the eye are buried in haze in the photograph, as in Figure 10-12.

Cleaning a kernel build is much like cleaning a regular project: it involves removing the output from prior builds. In the case of Linux, there are several different types of clean, listed here in order of increasing cleanliness: clean: Removes all the object files but keeps .config. Use this configuration option when you re testing whether the kernel rebuilds after you change to the configuration. mrproper: 1 Does everything that clean does and deletes .config and some of the architecture-related files and symlinks created as part of the configuration and build process. Use this when you want to restore the kernel source tree to the approximate state it was in before it was configured. distclean: Does everything that clean and mrproper do, plus deletes what appear to be editor backup, patch, and other files. Use distclean before you create or apply a patch file, because this target leaves the source tree in the most pristine state possible.

Overlay mode excels at cutting through haze. Make a layer copy, and then set the top layer to Overlay. The city becomes much clearer (Figure 10-13).

The RecordAudio activity will prompt the users and record their response in the specified format. You can add either static prompts or dynamic prompts. To add static prompts, doubleclick the [Edit Prompts] link to open the RecordAudio Property Builder dialog box, as shown in Figure 6-15.

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