Date: Thu, 13 Oct 2016 22:43:31 -0700 From: Oleksandr Tymoshenko <gonzo@bluezbox.com> To: freebsd-arm@freebsd.org Subject: Raspberry Pi 3 support Message-ID: <5F2E0B05-0A54-4BD6-9CFE-4DFF5FEF07DC@bluezbox.com>
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Hello,
Limited support for Raspberry Pi 3 has just landed in HEAD. No SMP
and no 3D yet. And no BT/WiFi drivers. If you would like to give it a =
spin
read this info, it may save you some googling time:
- SD card layout is the same as for RPi or RPi 2
- Firmware and DTB files can be downloaded from official repo:
https://github.com/raspberrypi/firmware/tree/master/boot
Just copy them as-is to FAT partition on SD. There are plans to
import latest .dts files and provide rpi3.dtb just like for
Raspberry Pi and Raspberry Pi 2
- boot mode on RPi 3 is controlled by arm_control parameter in =
config.txt,
set it to 0x200 to boot in 64-bit mode
- To reduce mess with consoles for now only PL01x UART is used (old one,=20=
not miniUART) in all boot component: firmware, U-Boot, kernel.
- On RPi 3 firmware defaults to miniUART, use =
"dtoverlay=3Dpi3-disable-bt=E2=80=9D in
config.txt to revert to old behaviour
- A lot of peripherals are disabled in default dtb, to enable them add =
this
line to config.txt before any dtoverlay line:
dtparam=3Daudio=3Don,i2c_arm=3Don,spi=3Don
- MMC is not included in dtb, add "dtoverlay=3Dmmc=E2=80=9D to =
config.txt to enable it
- Stock U-Boot uses miniUART as console so manual patching of
include/configs/rpi.h required. Just search for =
CONFIG_BCM283X_MU_SERIAL
or CONFIG_PL01X_SERIAL
- ubldr was switched for loader.efi, hence CONFIG_EFI is required for =
U-Boot.
Patch include/configs/rpi.h or pass CONFIG_EFI=3Dy to gmake when =
building
u-boot. Diane Bruce works on u-boot-rpi3 port that addresses all =
these
issues.
- No crochet config for RPi 3 yet
- To save you hassle, here are u-boot.bin, loader.efi, config.txt:
https://people.freebsd.org/~gonzo/arm/rpi3/
Copy these files to FAT partition along with firmware mentioned =
above
- bootcmd for EFI would look like:
fatload mmc 0 ${loadaddr} loader.efi; bootefi ${loadaddr} 0x100
where 0x100 is FDT blob address matching the value of =
device_tree_address
parameter in config.txt
=E2=80=94=20
gonzo=
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