Renesas RZ/N1S-DB Manuale utente

All information contained in these materials, including products and product specifications,

represents information on the product at the time of publication and is subject to change by

Renesas Electronics Corp. without notice. Please review the latest information published by

Renesas Electronics Corp. through various means, including the Renesas Technology Corp.

website (http://www.renesas.com).

www.renesas.com

RZ/N1S-DB Board

U-Boot

System-on-Chip

Target Device

RZ/N1S

R01QS0008EG0104

June 8, 2018

Quick Start Guide

1 INTRODUCTION

This guide aims to quickly get U-Boot running on your Renesas RZ/N1S-DB board.

There are several pieces of software that are used to load and run software on the RZ/N1, these

are discussed below. Pre-built binaries are provided to get you up and running quicker.

1.1 Renesas BootROM

The BootROM is internal to the device and is always run on reset. The BootROM loads the first

valid SPKG image from one of three sources, QSPI, NAND or USB DFU, the choice of which is

done via boot mode pins, and starts executing it. DFU is a protocol used with USB to update

software on embedded products; the RZ/N1 device will act as USB Device and is attached to a

USB Host, e.g. a PC.

An SPKG is a Renesas proprietary format that includes information on the size of the binary

payload, the destination for the payload, and optional signature information. For the purposes of

this document, we assume that the device allows SPKGs without a signature.

Note: The BootROM will only allow an SPKG payload to be written to internal SRAM as writing to

QSPI is board specific.

Normally, on the RZ/N1S-DB board, when the board is reset the BootROM will load an SPKG from

QSPI. Typically, this SPKG contains U-Boot or U-Boot/SPL.

However, by changing the boot mode pins state by holding down a switch when resetting the

board, the BootROM will start in USB DFU mode and will wait for the host PC to upload an SPKG.

1.2 U-Boot

U-Boot is a boot loader that allows you to run commands that can read and write to/from QSPI or

SD cards, load files from a TFTP server, program QSPI using USB DFU, start an OS and start the

Cortex-M3 processor.

Typically, U-Boot will load the Device Tree Blob (dtb) and OS image from QSPI, and pass

arguments to the kernel.

2 SETUP

2.1 RZ/N1S-DB Board

The main connectors and switches of the board are shown below.

CN3

USB Function

SW2

Boot Mode

SW9

Soft Reset

CN14

Power via USB

CN7

Debug

Connector

SW5

Multiplexer

Setup

SW4

SW Dip Switch

CN5

ETH5

CN1

ETH4

CN6

•FTDI serial-over-USB

•FTDI JTAG-over-USB

•Power Connector

SW3

SW1

RXCLK4

SW7

RXCLK5

SW12

SW10

SW11

The following switches must be set.

Switch bank SW5

Number

SW ON (low)

SW OFF (high)

Default

Setting

RMII/MII

LCD

OFF

CAT/S3

PMOD

MSEBI

Mixed

OFF

RMII2 / MDIO3

QSPI2-Memory

OFF

USB 1x Host 1x Device

USB 2 x Host

ARM Debug

FTDI Debug

Segger Debugger

I-Jet Debugger

OFF

Not used

OFF

Other switches

Switch

SW ON (white bar)

SW OFF

Default

Setting

SW3

JTAG Mode

ARM Coresight Mode

OFF

SW10

Boot from NAND

Boot from QSPI

OFF

SW11

LCD pull up

LCD pull down

SW12

LCD pull up

LCD pull down

SW1

RXCLK4 from PHY

RXCLK4 from GPIO61

SW7

RXCLK5 from PHY

RXCLK5 from GPIO61

Extension Board

The relevant switches of the Extension Board are shown below.

CN15, CN16

PHY2/3 MDIO

CN17, CN18

PHY1 MDIO

J18

I2C

J24

PHY3

(RGMII3)

J23

PHY2

(RGMII2)

J22

PHY1

(RGMII1)

CN14

5V or 12..24V

If using the Extension Board, please ensure the following jumper and switch settings are made:

Jumper

Description

Default Setting

CN15

PHY2/PHY3 MDC source

Connect pins 2 and 3 (MDC2)

CN16

PHY2/PHY3 MDIO source

Connect pins 2 and 3 (MDIO2)

CN17

PHY1 MDC source

Connect pins 1 and 2 (MDC1)

CN18

PHY1 MDIO source

Connect pins 1 and 2 (MDIO1)

J18

I2C SDA

Connect pins 1 and 2

(enable I2C SDA on Ext Board)

J18

I2C SCL

Connect pins 3 and 4

(enable I2C SCL on Ext Board)

Board Connections

Connect the following to your PC:

•Connect CN3 on the board to a USB Host connector on your PC. This provides USB DFU.

•Connect CN6 on the board to a USB Host connector on your PC. This provides

Serial-over-USB and JTAG-over-USB services. After the FTDI driver has been installed on

your PC, four additional virtual serial ports will exist. The board uses the 3rd port for UART

output at 115200,8,n,1. On Linux PCs, if you have no other serial-over-USB devices

attached, this is accessed using /dev/ttyUSB2.

•If the board is powered by USB, press switch SW9 to perform a soft reset.

•If you wish to use Ethernet, but do not have an Extension Board, you can connect CN1 on

the board to a dedicated Network Interface Card (NIC) on your PC. This is used by U-Boot

to access GMAC2 via the 5-Port Switch on the RZ/N1 device. Note that the U-Boot driver

for the 5-Port Switch simply configures it as an unmanaged switch.

•If you wish to use Ethernet, and are using the Extension Board, you can connect J22 of the

Extension Board to a dedicated Network Interface Card (NIC) on your PC. This is used to

access GMAC1 on the RZ/N1 device.

•By default, the board uses static IP addresses, so please ensure your host’s NIC is set up

with a static IP address of 192.168.1.30. This address is set by default in the U-Boot

serverip environment variable.

2.2 Write U-Boot to QSPI

This section provides instructions to program QSPI flash on a new board. You will need a Linux or

Windows host PC for this. The steps performed are:

•Use the BootROM DFU mode to load U-Boot (in SPKG format) into SRAM.

•Use the U-Boot dfu command to write U-Boot (in SPKG format) into QSPI.

1. On your Linux PC, install the ‘dfu-util’ package, e.g.:

sudo apt-get install dfu-util

If using a Windows PC, follow the instructions in the U-Boot User Manual for installing dfu-util.

For all of the subsequent Linux commands below that start ‘sudo dfu-util’, please replace with

Windows commands starting with ‘dfu-util-static.exe’.

2. On the board, hold down switch SW2 (to select DFU boot mode instead of QSPI) and press

switch SW9 (soft reset). The RZ/N1 serial port should output:

** BOOTLOADER STAGE0 for RZN1 **

Boot source: USB

3. Download U-Boot to SRAM. On your host PC run:

sudo dfu-util -D u-boot-rzn1s324-db.bin.spkg

4. U-Boot should run and the RZ/N1 serial port presents you with a console, similar to this:

U-Boot 2017.01

Model: RZ/N1S-DB board

DRAM: 4 MiB

MMC: sdhci@0x40100000: 0

SF: Detected mx25l25635f with page size 256 Bytes, erase size 64 KiB,

total 32 MiB, mapped at 10000000

In: serial@0x40060000

Out: serial@0x40060000

Err: serial@0x40060000

Net: dwmac.44000000, dwmac.44002000

Hit any key to stop autoboot: 0

Note:If your board has previously been used and already has U-Boot environment variables

programmed into QSPI, U-Boot may attempt to start running the commands specified by the

bootcmd env variable. Interrupt this by pressing any key.

5. If your board has been programmed with an older version of U-Boot, the dfu_ext_info

environment variable may be incompatible. If so, at the U-Boot console please run:

env default -f dfu_ext_info

saveenv

6. Ensure the U-Boot/SPL region of QSPI Flash is erased, run:

sf probe

sf erase 0 10000

7. On the U-Boot console, run:

dfu

8. Write U-Boot to QSPI. On your host PC run:

sudo dfu-util -a "sf_uboot" -D u-boot-rzn1s324-db.bin.spkg

Wait until it completes, the U-Boot console will prompt you to press Ctrl-C when done.

Note:The "sf_uboot" DFU target corresponds to the second region of the QSPI Flash. If there

is a valid SPKG written into the first region ("sf_spl"), the BootROM will load this instead of

U-Boot. Otherwise the BootROM will output messages whilst it looks for the first valid SPKG,

similar to:

STATUS: Valid SPKG header not found (100 QSPI Flash 256-byte blocks read)

9. Press switch SW9 to reset the board, the BootROM will load and run U-Boot showing the

following output on the terminal:

** BOOTLOADER STAGE0 for RZN1 **

Boot source: QSPI

00 BOOTLOADER STAGE0 Success

*** Bootloader stage0 END ***

*** Execute 2nd Stage Bootloader which has been loaded and verified ***

U-Boot 2017.01

Model: RZ/N1S-DB board

DRAM: 4 MiB

MMC: sdhci@0x40100000: 0

SF: Detected mx25l25635f with page size 256 Bytes, erase size 64 KiB,

total 32 MiB, mapped at 10000000

In: serial@0x40060000

Out: serial@0x40060000

Err: serial@0x40060000

Net: dwmac.44000000, dwmac.44002000

Hit any key to stop autoboot: 0

2.3 Setup U-Boot environment variables

This sets up the U-Boot environment variables for your board. From U-Boot, set the MAC

addresses corresponding to the MAC address sticker on the board, for example:

setenv -f ethaddr 74:90:50:02:00:FD

setenv -f eth1addr 74:90:50:02:00:FE

Save the environment variables:

saveenv

2.4 OpenOCD Debugger

This section provides basic information on how to connect a debugger to the ARM Cortex A7 CPU

on the board. The board uses an FTDI device to provide JTAG over USB which is supported via

the OpenOCD software. Note that openocd v0.10.0 adds support for MMU address translation

and cache flushing which is required to debug the Linux kernel or other OS that uses the MMU to

remap memory ranges. However, if you connect to the target after it has executed code to enable

the MMU and cache, download performance will be significantly slower due to the MMU table look

ups. OpenOCD v0.10.0 has issues debugging ARM Thumb2 code, so please build the latest

version.

git clone http://repo.or.cz/openocd.git

cd openocd

./bootstrap

./configure --disable-jlink

make clean

make

sudo make install

OpenOCD provides a “gdbserver” so you can connect to Eclipse or other debuggers that supports

this protocol. The following instructions detail how to connect to the gdbserver using the gdb

command line debugger.

Ensure switch SW5-6 is OFF and switch SW3 is OFF, i.e. away from the white bar.

Below we show basic commands to get you started with GDB. Further details on using OpenOCD

with GDB can be found at http://openocd.org/doc/html/GDB-and-OpenOCD.html.

Connect to the board using the configuration file provided by Renesas. This starts a GDBServer

which you can connect to from gdb or any other debugger that supports connecting to a

GDBServer.

openocd -f renesas-rzn1s-openocd.cfg

In a separate terminal, you can now connect using gdb. Specify the U-Boot elf file on the

command line. You can use the -tui option to show source code in a simplified GUI:

arm-linux-gnueabihf-gdb -tui u-boot

...

(gdb) target remote localhost:3333

Read symbols from the ELF file specified on the gdb command line, u-boot in this example, and

download the code to the RZ/N1 SRAM:

(gdb) load

Loading section .text, size 0x1ffc0 lma 0x200a0000

...

Start address 0x200a0000, load size 217553

Note: The U-Boot elf file is actually different to the binary image, so download the binary

(gdb) mon load_image u-boot.bin 0x200a0000 bin

Step into the code:

(gdb) s

Set a breakpoint at the start of a function:

(gdb) b board_init

Run the code until you hit a breakpoint:

(gdb) c

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