SMP support for Raspberry Pi 3

[George Neville-Neil]

On 29 Nov 2016, at 15:55, Oleksandr Tymoshenko wrote:

> Hello,
>
> SMP support for Raspberry Pi 3 is in usable state now. I didn’t run
> any load tests, only checked that all four cores are started on boot.
>
> Short instruction:
>
> - Build GENERIC arm64 kernel for your image, not GENERIC-UP
> - Copy https://people.freebsd.org/~gonzo/arm/rpi3-smp/u-boot.bin and
>     https://people.freebsd.org/~gonzo/arm/rpi3-smp/armstub8.bin to FAT
>     partition on SD card.
> - Edit config.txt: change value of device_tree_address parameter:
>     device_tree_address=0x4000
> - Reboot device. It should boot with all four cores enabled and reboot
>     should work too.
>
> More detailed description of what all these binaries/changes contain
> is in these two posts:
>
> https://kernelnomicon.org/?p=714
> https://kernelnomicon.org/?p=718
>
> Please note that FreeBSD/arm64 has been broken by clang 3.9.0 import
> and you will have to update aarch64-binutils to the 2.27_5 to get
> it booting. Details: https://reviews.freebsd.org/D8622
>

Thanks for all this work!  I'm going to be away for about 10 days but 
will test this on the pi-top I have when I get back.

Best,
George