R-Car/Boards/U-Boot-Gen3

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Introduction

This is the Wiki for the U-Boot on Renesas R-Car Gen3 SoCs and boards . Refer to the R-Car page for information about Renesas' R-Car SoC family.

Supported boards

As of U-Boot 2019.04, the following boards are supported:

Supported boards in U-Boot 2019.04
Board U-Boot defconfig Update procedure
R8A7795 H3 ULCB r8a7795_ulcb_defconfig Flashing firmware
R8A7796 M3 ULCB r8a7796_ulcb_defconfig Flashing firmware
R8A7795 H3 Salvator-X/XS ES2.0+ r8a7795_salvator-x_defconfig N/A
R8A7796 M3-W Salvator-X/XS r8a7796_salvator-x_defconfig N/A
R8A77965 M3-N Salvator-X/XS r8a77965_salvator-x_defconfig N/A
R8A77970 V3M Eagle r8a77970_eagle_defconfig N/A
R8A77990 E3 Ebisu r8a77990_ebisu_defconfig N/A
R8A77995 D3 Draak r8a77995_draak_defconfig N/A

! WARNING: R-Car R8A7795 H3 ES1.x is NOT supported!

Building U-Boot manually

Building U-Boot can be done manually by using the U-Boot sources. This process does NOT produce IPL/ATF/BL binaries, only U-Boot binary is produced.

Prerequisites

  • Running mainline U-Boot is only supported with IPL/ATF/BL revision 2.23 and newer.
  • ARM cross-compiler is mandatory to build U-Boot.

ARM cross-compiler

Debian and Ubuntu includes an ARM cross-compiler in its standard package feed. You can install it as follows:

apt-get install gcc-aarch64-linux-gnu

Other distributions likely also provide ARM cross-compilers. Consult distro-specific documentation for details.

Obtain U-Boot sources

The preferred method of obtaining U-Boot sources is through git VCS, using git protocol:

git clone git://git.denx.de/u-boot.git

or via HTTP:

git clone http://git.denx.de/u-boot.git

Finally, check out the version of U-Boot that will be used for the build:

cd u-boot
git checkout -b my_working_branch v2019.04

U-Boot git hosting also provides snapshots.

Prepare build environment

Before building U-Boot for R-Car Gen3 system, the following environment variables need to be configured:

export ARCH=arm64
export CROSS_COMPILE=aarch64-linux-gnu-

The later variable must match the prefix of the Aarch64 cross-toolchain installed on your system, the example above is valid for Debian and Ubuntu,

Build U-Boot

The U-Boot sources must be configured for a particular supported platform. List of supported platforms and matching U-Boot defconfigs is available at supported boards.

make r8a779x_y_defconfig

for example to configure U-Boot sources for R8A7795 H3 ULCB board:

make r8a7795_ulcb_defconfig

Once configured, U-Boot sources can be compiled to produce u-boot.bin and u-boot-elf.srec:

make

To speed up build process, -jN option can be passed to make to start multiple jobs at the same time, this is beneficial especially on SMP systems. The following example starts up to (number of CPUs in a system + 1) jobs, which is the recommended amount:

make -j`expr \`nproc\` + 1`

Flashing U-Boot

Each platform has a slightly different process for updating the content of the flash. The list of supported boards contains links to instructions for updating each supported board.