Introduction

As the IO board of the Raspberry Pi Compute Module 5, CM5-IO-BASE-B is a baseboard that can be used with the Raspberry Pi Compute Module 5. With powerful features are integrated into a compact design, it is only the size of a bank card. It comes with two USB3.2 Gen1 ports and two USB2.0 ports onboard, making it convenient for users.

Features and Precautions

1. Do not plug or unplug any device other than USB and HDMI when the device is powered on
2. Type C can be used as a USB SLAVE interface to flash images.
3. Onboard default 2 USB 3.2 Gen1 ports
4. Supports 4 screens to display different contents, adds MIPI DSI driver, regardless of whether a screen is connected, the system will default to connect, the screen will display in split-screen mode (related to the system version)
5. The onboard BOOT button, you can press the BOOT button before powering on, and connect to the computer through Type C to let the device enter the flashing mode
6. Do not connect other devices when using Type C to flash. Insufficient power supply for burning will cause the device to be unrecognized
7. The USB ports have a total maximum power output of 2A

Dimensions

Core Board Size

Baseboard Size

Case Size

Stay tuned...

Image Flashing

How to Flash

Enter burning mode
1. The onboard BOOT button, you can press the BOOT button before powering on, and connect to the computer through Type C to let the device enter the flashing mode

Click here for EMMC version
Click here for LITE version

M.2

1. Enable PCIE interface

PI5B defaults to not having the PCIE interface enabled. Add to /boot/firmware/config.txt:
dtparam=pciex1

2. PCIE is gen2 by default, if you need to enable PCIE gen3, then add following to /boot/firmware/config.txt:

dtparam=pciex1_gen=3

3. After the modification, reboot the PI5, and the device can be recognized.

As shown in the figure below, SM2263 is identified as my SSD solid state drives, and the other PI5 is the RPI chip

4. Partition, skip this step if you have partitioned and formatted on other platforms (Note: partitioning will delete all data on the SSD, proceed with caution)

Lsblk     This command is executed to view the disk (if you want to see the details, run the sudo fdisk -l command)

Partition: 
sudo fdisk /dev/nvme0n1    The device number is the total device number, do not add p1, that is just a partition
How to use the partitioning tool fdisk:
n New partition
q Quit without saving
p Print the partition table
m Print the selection menu
D Delete the partition
w Save and exit
t Modify the ID number
Add the partition and execute n, then save and exit with w

5. Format

sudo mkfs.     Execute the command and press Tab key, you will see a lot of different suffixes, and the different suffixes are the formats you need to format

If I want to format it in ext4 file format, then execute the command:
sudo mkfs.ext4 /dev/nvme0n1p1
Wait a moment, once all "done" appear as below, it indicates that the formatting is completed

6. Mount

Create a mount directory
sudo mkdir toshiba
Mount the device
sudo mount /dev/nvme0n1p1 ./toshiba
Check the disk status
df -h

Read/Write Test

Enter the directory where the disk is mounted

cd toshiba

• Free up the memory

sudo sh -c "sync && echo 3 > /proc/sys/vm/drop_caches"

• Copy Raspberry Pi memory content to the hard disk (write)

sudo dd if=/dev/zero of=./test_write count=2000 bs=1024k

• Copy the hard drive content to the Raspberry Pi memory (/etc/fstab read )

 sudo dd if=./test_write of=/dev/null count=2000 bs=1024k

• Note: The test results vary for different cards and environments. The Raspberry Pi is significantly affected. If you want to test accurate performance, use a PC for the test
  

Auto Mount

Test shows there's no issue. If it's not required to be used as a system disk, but only for expanding the disk, set it to auto-mount

sudo nano /etc/fstab

#Add at the end
/dev/nvme0n1p1  /home/pi/toshiba  ext4  defaults  0  0
#/dev/nvme0n1p1 is the device name, /home/pi/toshiba refers to mounting to a directory, ext4 is the file system type, defaults uses the default mount option
#Make the changes take effect (reboot only after testing, otherwise it will fail to mount and boot)
sudo mount -a

#Then reboot
Check the device with lsblk

NVMe SSD Boot

Boot the Raspberry Pi with a TF card first, mount and test it, and make sure the hardware can work properly

Choose one of the following methods

Method 1

1. Run the following command:

sudo raspi-config

2. Reboot Raspberry Pi

If you find you can't modify it multiple times, please reconnect to the network and then try to modify it (wait for the network to self-calibrate), or modify the file after setting the correct time

3. Burn the system to NVME, then connect the NVME to the expansion board, remove the TF card and power it on again

Method 2

1. Modify the BOOT_ORDER in the Raspberry Pi boot loader configuration:

sudo rpi-eeprom-config --edit 
Modify BOOT_ORDER=0xf41 to BOOT_ORDER=0xf416

For more information, please refer to BOOT_ORDER 

2. Reboot Raspberry Pi

If you find you can't modify it multiple times, please reconnect to the network and then try to modify it (wait for the network to self-calibrate), or modify the file after setting the correct time

3. Burn the system to NVME, then connect the NVME to the expansion board, remove the TF card and power it on again

Fan Control

The PI5 fan defaults to starting when the temperature reaches 50 degrees. If you want to control it at other temperatures, you can do so by adding specific content to /boot/firmware/config.txt, for example:

dtparam=fan_temp0=36000,fan_temp0_hyst=2000,fan_temp0_speed=90
dtparam=fan_temp1=40000,fan_temp1_hyst=3000,fan_temp1_speed=150
dtparam=fan_temp2=52000,fan_temp2_hyst=4000,fan_temp2_speed=200
dtparam=fan_temp3=58000,fan_temp3_hyst=5000,fan_temp3_speed=255

Among which:

fan_temp0/1/2/3               Indicates the temperature (36000 means 36℃)

fan_temp0/1/2/3_speed  Indicates the corresponding rotational speed (value up to 255)

fan_temp0/1/2/3_hyst      Indicates the hysteresis temperature

For more details, refer to here

Notice: There are only 4 temperatures, 0, 1, 2 and 3, and it's not possible to set other temperatures. The hysteresis temperature must not exceed the step range between two temperatures

MIPI

Support dual MIPI, customers can freely choose CSI or DSI connections

The DSI screen is 800x480 resolution screen by default, please refer to the corresponding WIKI for other resolution screens

DSI

#Add the following to the config.txt file:
sudo nano /boot/firmware/config.txt
#DSI0 
dtoverlay=vc4-kms-dsi-7inch,dsi0
#DSI1 
dtoverlay=vc4-kms-dsi-7inch,dsi1

CSI

sudo nano /boot/firmware/config.txt

Allow one connection to DSI and one connection to CSI, for example, use IMX219 to connect to MIPI1
For example, if you want to connect a DSI display to MIPI0, add the following to the config.txt file

dtoverlay=imx219,cam1
dtoverlay=vc4-kms-dsi-7inch,dsi0

Use the shortcut Ctrl+o to save the file, then press Enter

sudo reboot

Test Camera

1. Enter the camera detection command, and you can see that the camera has been detected

   libcamera-hello --list-cameras

   
   
   
2. Display the camera screen to the desktop

   libcamera-hello -t 0

3. Take a photo

   libcamera-jpeg -o test.jpg

4. Record a 10s video

   libcamera-vid -t 10000 -o test.h264

Other commands
Check if the camera is detected

libcamera-hello --list-cameras

Open the corresponding camera

libcamera-hello  --camera 1
libcamera-hello  --camera 0

Take a photo

libcamera-jpeg -o test.jpg
#You can add --camera to specify the camera

Real-Time Clock (RTC)

There is no battery by default, and an additional RTC battery is required

Software Debugging

The default device is /dev/rtc0

Regarding time, by inputting "date" in the command line, you can see the current time. Connecting the Raspberry Pi system to the network will automatically synchronize the time. If the default RTC device is connected and functioning properly, the RTC time will be updated after the automatic network synchronization

sudo hwclock -r Read the RTC time, if there are multiple RTC devices, you can use -f to select the corresponding devices (for example: sudo hwclock -f /dev/rtc1 -r)

Hwclock

System clock -> Hardware clock (RTC)

sudo hwclock -w

Synchronize hardware clock (RTC) -> System clock

sudo hwclock  -s
 #Need to turn off the network, or disable network time synchronization, otherwise it will be changed back

Set the hardware clock time (RTC):

sudo hwclock --set --date="9/8/2023 16:45:05"

View the hardware clock (RTC)

sudo hwclock -r

Show version information.

sudo hwclock --verbose

Automated Wakeup

To support a low-power mode for wake-up alarms, add the configuration:

sudo -E rpi-eeprom-config --edit
#Add the following 2 lines
POWER_OFF_ON_HALT=1
WAKE_ON_GPIO=0
#Restart the device after adding (if you connect to the serial port log, you can see that there are update related logs)
sudo reboot
#You can use the following methods to test the function:
echo +600 | sudo tee /sys/class/rtc/rtc0/wakealarm
sudo halt  or  sudo poweroff
#10 minutes later, it will be awakened and restarted

RTC Battery Charging

Note: Before adding this, make sure your RTC battery allows charging and check the maximum allowable voltage

sudo nano /boot/firmware/config.txt
#Add
dtparam=rtc_bbat_vchg=3000000
#Among these, 3,000,000 represents the maximum voltage. Charging will stop when it reaches 3V, and the charging will restart with a trickle charge when the voltage drops below 3V

USB

The onboard USB interface is USB3.2 Gen2 interface, and the speed is not shared (5Gbps rate can be at the same time)

The USB cable interface is USB 2.0, with a shared speed of 480Mbps

The total current is limited to 2A

Encryption Chip (ATSHA204)

I2C address: 0x64
I2C bus: I2C1 (default GPIO2,3)
Onboard encryption chip, not enabled by default
For usage details, please refer to the datasheet and official library: https://github.com/MicrochipTech/cryptoauthlib

EEPROM（CAT24C32）

I2C address: 0x50 (default)
I2C bus: I2C1 (default GPIO2,3)

The I2C address can be switched through resistors

I2C Bus Switching

The I2C bus can be switched through resistors (the switch will switch the EEPROM and the encryption chip together)

I2C0 (GPIO0,1)
I2C1 (GPIO2,3)