R-Car/Boards/Salvator-XS

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Introduction

This is the Wiki for the Renesas Salvator-XS (Salvator-X 2nd version) board, which is available in different versions, depending on the actual SiP mounted:

  • RTP0RC7795SIPB0012S (with R-Car H3 ES2.0),
  • RTP0RC7796SIPB0012S (with R-Car M3-W),
  • RTP0RC77965SIPB012S (with R-Car M3-N).

Refer to the R-Car page for information about Renesas' R-Car SoC family.

Serial Console

Use a micro-USB cable to connect to "Debug Serial 0". Serial settings are 115200 8N1.

Unfortunately the CP2102 USB-to-UART bridges on Salvator-XS boards have the same serial strings (0001 resp. 00002 for Debug Serial 0 resp. 1), complicating identifying consoles on multiple boards. If you have multiple boards connected to the same host and you want stable serial ports, there are two options:

  1. Refer to the ports using the symbolic links under /dev/serial/by-path/, instead of the /dev/ttyUSB* names,
  2. Program the ports' serial strings to your liking (e.g. salvator-xs-1884-debug0) using the tool at https://github.com/DiUS/cp210x-cfg, and refer to the ports using the symbolic links under /dev/serial/by-id/, instead of the /dev/ttyUSB* names.

Booting Linux

 * Kernel config: defconfig
 * Kernel image: arch/arm64/boot/Image
 * DTB: arch/arm64/boot/dts/renesas/r8a7795-salvator-xs.dtb (for R-Car H3)
 * DTB: arch/arm64/boot/dts/renesas/r8a7796-salvator-xs.dtb (for R-Car M3-W)
 * DTB: arch/arm64/boot/dts/renesas/r8a77965-salvator-xs.dtb (for R-Car M3-N)

U-Boot boot command:

tftpboot 0x48080000 Image
tftpboot 0x49f00000 r8a7795-salvator-xs.dtb (for R-Car H3)
tftpboot 0x49f00000 r8a7796-salvator-xs.dtb (for R-Car M3-W)
tftpboot 0x49f00000 r8a77965-salvator-xs.dtb (for R-Car M3-N)
booti 0x48080000 - 0x49f00000


Suspend-to-RAM

PSCI System Suspend

The system can be suspended by triggering a PSCI System Suspend:

echo mem > /sys/power/state

Caveats:

  • Before you can use the above, you must configure the PMIC for DDR Backup Mode first, using the command below, followed by switching SW23 off:
echo on > /sys/bus/i2c/drivers/bd9571mwv/*/bd9571mwv-regulator*/backup_mode
  • On kernels up to and including v4.18, the "backup_mode" sysfs file doesn't exist. Hence you must use i2cset instead, and repeat this operation after each wake-up:
i2cset -f -y 7 0x30 0x20 0x0F
  • PSCI System Suspend supports wake-up by PMIC only. Switch SW23 on to resume the system.

Suspend-to-Idle

If you want to suspend the system, and wake up through other wake-up sources, you must use Suspend-to-Idle instead of PSCI System Suspend.

The system can be suspended ("frozen") using:

echo freeze > /sys/power/state

Alternatively (since v4.10), you can configure the system to use Suspend-to-Idle by default:

echo s2idle > /sys/power/mem_sleep

After that, you can suspend the system using the standard:

echo mem > /sys/power/state

Wake-Up Sources

Suspend-to-Idle supports the following wake-up sources:

  • gpio-keys: Not enabled in the upstream kernel due to sharing of GPIOs between switches and LEDs, but see Remote Control below.
  • ravb (Ethernet): Configure using one of:
ethtool -s eth0 wol g # Enable wake on MagicPacket
ethtool -s eth0 wol d # Disable

Wake-up by sending a MagicPacket from another system using:

wakeonlan <mac-address> | <hostname> | <ip-address> # <hostname> or <ip-address> must be in /etc/ethers
  • sh-sci (Serial): Disabled by default
  • usb: Disabled by default

Remote Control

Operation Signal A Pin A Signal B Pin B Connector needed Comments
Reset #MRB/SYSRSTn EXIO-D pin 66 GND EXIO-D pin 58 Samtec QTE-020 or -040
Wake-Up IRQ1n/GP2_01 EXIO-D pin 50 GND EXIO-D pin 46 Samtec QTE-020 or -040 Needs arm64: dts: salvator-common: Enable GP2_1 for wake-up from renesas-drivers#topic/board-farm
ACC OFF #RSTB/EX_PWRONn EXIO-D pin 68 D5.0V CN7 pin 4 Samtec QTE-020 or -040, and 5¼ HDD power Pull high via 10K resistor to power off (47K to D12.0V might be better, cfr. Ebisu, but is untested)