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boot/loader: How to boot Linux and nothing else

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 Stelmach, Łukasz

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boot/loader: How to boot Linux and nothing else
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490
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CC Attribution 2.0 Belgium:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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To boot Linux on a new ARM/ARM64 platform we have to port Linux to that platform and a bootloader. Aside from the platform setup code, we need to add and maintain some device drivers to both Linux and the bootloader. We decided to avoid the extra effort and get rid of the dedicated bootloader. With a few dozen lines of assembly code, Linux Kernel and a pinch of userland tools the "boot" kernel was running with all the cool features we wanted! Then we used kexec(2) to start a "full" Linux kernel.