June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Finding out which kernel target to build
To build a kernel image, you need to know what your bootloader expects. This is a rough guide:
- U-Boot: Traditionally, U-Boot has required uImage, but newer versions can load a zImage file using the bootz command
- x86 targets: Requires a bzImage file
- Most other bootloaders: Require a zImage file
Here is an example of building a zImage file:
$ make -j 4 ARCH=arm CROSS_COMPILE=arm-cortex_a8-linux-gnueabihf- zImage
The -j 4 option tells make how many jobs to run in parallel, which reduces the time taken to build. A rough guide is to run as many jobs as you have CPU cores.
There is a small issue with building a uImage file for ARM with multi-platform support, which is the norm for the current generation ...
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