Introduction
============
RK3399 key features we might use in U-Boot:
* CPU: ARMv8 64bit Big-Little architecture,
* Big: dual-core Cortex-A72
* Little: quad-core Cortex-A53
* IRAM: 200KB
* DRAM: 4GB-128MB dual-channel
* eMMC: support eMMC 5.0/5.1, suport HS400, HS200, DDR50
* SD/MMC: support SD 3.0, MMC 4.51
* USB: USB3.0 typc-C port *2 with dwc3 controller
* USB2.0 EHCI host port *2
* Display: RGB/HDMI/DP/MIPI/EDP
evb key features:
* regulator: pwm regulator for CPU B/L
* PMIC: rk808
* debug console: UART2
In order to support Arm Trust Firmware(ATF), we need to use the
miniloader from rockchip which:
* do DRAM init
* load and verify ATF image
* load and verify U-Boot image
Here is the step-by-step to boot to U-Boot on rk3399.
Get the Source and prebuild binary
==================================
> mkdir ~/evb_rk3399
> cd ~/evb_rk3399
> git clone https://github.com/ARM-software/arm-trusted-firmware.git
> git clone https://github.com/rockchip-linux/rkbin
> git clone https://github.com/rockchip-linux/rkflashtool
Compile the ATF
===============
> cd arm-trusted-firmware
> make realclean
> make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl31
Compile the U-Boot
==================
> cd ../u-boot
> make CROSS_COMPILE=aarch64-linux-gnu- evb-rk3399_defconfig all
Compile the rkflashtool
=======================
> cd ../rkflashtool
> make
Package the image for miniloader
================================
> cd ..
> cp arm-trusted-firmware/build/rk3399/release/bl31.bin rkbin/rk33
> ./rkbin/tools/trust_merger rkbin/tools/RK3399TRUST.ini
> ./rkbin/tools/loaderimage --pack --uboot u-boot/u-boot-dtb.bin uboot.img
> mkdir image
> mv trust.img ./image/
> mv uboot.img ./image/rk3399evb-uboot.bin
Flash the image
===============
Power on(or reset with RESET KEY) with MASKROM KEY preesed, and then:
> ./rkflashtool/rkflashloader rk3399evb
You should be able to get U-Boot log message in console/UART2 now.
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