[U-Boot] Booting on RK3399

[Mark Kettenis]

> From: Jagan Teki <jagan at amarulasolutions.com>
> Date: Thu, 3 Jan 2019 20:53:43 +0530
> 
> On Thu, Jan 3, 2019 at 7:20 AM Mark Kettenis <mark.kettenis at xs4all.nl> wrote:
> >
> > > From: Simon Glass <sjg at chromium.org>
> > > Date: Wed, 2 Jan 2019 18:15:31 -0700
> > >
> > > Hi Kever,
> > >
> > > I have a firefly-rk3399 and would like to boot it into U-Boot (as a start)
> > > from an uSD card.
> > >
> > > Are there instructions somewhere on how to do this? I gather that I need
> > > OP-TEE but not how to build it or how to put the image together. I would
> > > like to have instructions in README.rockchip if possible.
> > >
> > > I'm planning to add U-Boot support for bob and maybe kevin (both
> > > Chromebooks) but am not sure where to start. I thought the firefly might be
> > > best since it is pretty common.
> >
> > Hi Simon,
> >
> > The instructions in board/u-boot/rockchip/evb_rk3399/README apply to
> > the firefly-rk3399 as well.  I've successfully built working firmware
> > for my board using the TF-A (ATF) 2.0 release and U-Boot SPL in the
> > past that way.
> 
> What is TF-A here, I'm trying to build master, but it's failed to build

TF-A (Trusted Firmware-A) == ATF (Arm Trusted Firmware)

For seam reasom ARM, eh I mean arm, decided to rebrand it.


> $ make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl31
> make -C plat/rockchip/rk3399/drivers/m0
> BUILD=/root/arm-trusted-firmware/build/rk3399/release/m0
> make[1]: Entering directory
> '/root/arm-trusted-firmware/plat/rockchip/rk3399/drivers/m0'
>   CC      src/dram.c
> arm-none-eabi-gcc -g -mcpu=cortex-m0 -mthumb -Wall -O3 -nostdlib
> -mfloat-abi=soft -ffunction-sections -fdata-sections
> -fomit-frame-pointer -fno-common -Iinclude/ -I../../include/shared/
> -MMD -MT /root/arm-trusted-firmware/build/rk3399/release/m0/dram.o -c
> src/dram.c -o /root/arm-trusted-firmware/build/rk3399/release/m0/dram.o
> make[1]: arm-none-eabi-gcc: Command not found

The RK3399 has a Cortex-M0 MCU built into it, and TF-A includes a
firmware for that.  I think it is supposed to assist the SoC with
suspend/resume.

You'll need to install an arm-none-eabi- cross compiler as well to
build it.

Cheers,

Mark