upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/board/theobroma-systems/puma_rk3399
..
Kconfig
MAINTAINERS
Makefile
README
fit_spl_atf.its
puma-rk3399.c

README

Introduction
============

The RK3399-Q7 (Puma) is a system-on-module featuring the Rockchip
RK3399 in a Qseven-compatible form-factor.

RK3399-Q7 features:
* CPU: ARMv8 64bit Big-Little architecture,
* Big: dual-core Cortex-A72
* Little: quad-core Cortex-A53
* IRAM: 200KB
* DRAM: 4GB-128MB dual-channel
* eMMC: onboard eMMC
* SD/MMC
* GbE (onboard Micrel KSZ9031) Gigabit ethernet PHY
* USB:
* USB3.0 dual role port
* 2x USB3.0 host, 1x USB2.0 host via onboard USB3.0 hub
* Display: HDMI/eDP/MIPI
* Camera: 2x CSI (one on the edge connector, one on the Q7 specified CSI ZIF)
* NOR Flash: onboard SPI NOR
* Companion Controller: onboard additional Cortex-M0 microcontroller
* RTC
* fan controller
* CAN

Here is the step-by-step to boot to U-Boot on rk3399.

Get the Source and build ATF/Cortex-M0 binaries
===============================================

> git clone git://git.theobroma-systems.com/arm-trusted-firmware.git
> git clone git://git.theobroma-systems.com/rk3399-cortex-m0.git

Compile the ATF
===============

> cd arm-trusted-firmware
> make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl31
> cp build/rk3399/release/bl31.bin ../u-boot

Compile the M0 firmware
=======================

> cd ../rk3399-cortex-m0
> make CROSS_COMPILE=arm-cortex_m0-eabi-
> cp rk3399m0.bin ../u-boot

Compile the U-Boot
==================

> cd ../u-boot
> make CROSS_COMPILE=aarch64-linux-gnu- puma-rk3399_defconfig all

Package the image
=================

> tools/mkimage -n rk3399 -T rksd -d spl/u-boot-spl.bin spl.img
> make CROSS_COMPILE=aarch64-linux-gnu- u-boot.itb

Flash the image
===============

Copy the SPL to offset 32k and the FIT image containing the payloads
(U-Boot proper, ATF, M0 Firmware, devicetree) to offset 256k on a SD
card.

> dd if=spl.img of=/dev/sdb seek=64
> dd if=u-boot.itb of=/dev/sdb seek=512

After powering up the board (with the inserted SD card), you should see
a U-Boot console on UART0 (115200n8).