Baremetal OS

In order to support Arm Trust Firmware(ATF), we can use either SPL or miniloader from rockchip to do:

• 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
  > git clone https://github.com/rockchip-linux/rkdeveloptool.git

Compile the ATF

  > cd arm-trusted-firmware
  > make realclean
  > make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl31

Or you can get the bl31.elf directly from Rockchip:

  > cp rkbin/rk33/rk3399_bl31_v1.00.elf ../u-boot/bl31.elf

Get bl31.elf in this step, copy it to U-Boot root dir:

  > cp bl31.elf ../u-boot/

Compile the U-Boot

  > cd ../u-boot
  > export ARCH=arm64
  > export CROSS_COMPILE=aarch64-linux-gnu-
  > make evb-rk3399_defconfig
  # for firefly-rk3399, use below instead:
  > make roc-pc-rk3399_defconfig
  > make
  > make u-boot.itb

Get spl/u-boot-spl.bin and u-boot.itb in this step.

Compile the rkdeveloptool

Follow instructions in latest README

  > cd ../rkdeveloptool
  > autoreconf -i
  > ./configure
  > make
  > sudo make install

Get rkdeveloptool in you Host in this step.

Both origin binaries and Tool are ready now, choose either option 1 or option 2 to deploy U-Boot.

Package the image

Package the image for Rockchip miniloader

  > cd ..
  > cp arm-trusted-firmware/build/rk3399/release/bl31/bl31.elf rkbin/rk33
  > ./tools/trust_merger rkbin/MKTRUST/RK3399TRUST.ini
  > ./tools/loaderimage --pack --uboot u-boot-dtb.bin uboot.img

Get trust.img and uboot.img in this step.

Flash the image to eMMC

Flash the image with Rockchip miniloader

Power on(or reset with RESET KEY) with MASKROM KEY preesed, and then:

sudo rkdeveloptool db rkbin/bin/rk33/rk3399_loader_v1.12.112.bin
sudo rkdeveloptool ul rkbin/bin/rk33/rk3399_loader_v1.12.112.bin
sudo rkdeveloptool wl 0x4000 uboot.img
sudo rkdeveloptool wl 0x6000 rkbin/img/trust.img
sudo rkdeveloptool rd