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Raspberry Pi Bare Bones: Difference between revisions
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With newer versions of the Pi, there's a bit more to be done. Raspberry Pis 2 and 3 (the first model that supports 64 bit) have 4 cores. On boot, all cores are running and executing the same boot code. Therefore you have to distinguish cores, and only allow one of them to run, putting the others in an infinite loop.
The environment is set up and execution to _start transferred from [https://github.com/raspberrypi/tools/blob/master/armstubs/armstub7.S#L167 armstub7.s].
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// AArch32 mode
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// r15 -> should begin execution at 0x8000.
// r0 -> 0x00000000
// r1 -> 0x00000C42 - machine id
// r2 -> 0x00000100 - start of ATAGS
// preserve these registers as argument for kernel_main
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