OSD32MP1-BRK

This topic has 6 replies, 2 voices, and was last updated 1 day, 10 hours ago by ML.

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- January 30, 2025 at 2:38 am #15698
  ML
  Participant
  Hi all
  I would like to program the 4K EEPROM residing in OSD32MP157C chip.
  I am using OSD32MP1-BRK which contains the chip.
  Anyone can advise me how to do it?
- January 31, 2025 at 12:13 pm #15700
  Neeraj Dantu
  Moderator
  ML,
  The EEPROM is configured in the device tree here: https://github.com/octavosystems/OSD32MP1-BRK-device-tree/blob/kirkstone/linux-v5.15.24-stm32mp1-r1/stm32mp157c-osd32mp1-brk.dts#L837. You should be able to access it using the SYSFS via ‘/sys/bus/i2c/devices/3-0050/’. ‘3’ is the I2C interface number that the EEPROM is on and ‘0050’ is the address of the EEPROM. This directory contains file “eeprom”, which you can use to interact with the EEPROM. Please see https://stackoverflow.com/a/60781512.
  There are a number of other ways including using Linux IOCTL/python libraries/[shell commands: i2ctools]. See https://wiki.st.com/stm32mpu/wiki/I2C_i2c-tools for useful info on using i2ctools.
  Best,
  Neeraj
- February 7, 2025 at 2:27 am #15746
  ML
  Participant
  HI Neeraj, thanks for the reply!
  I am green horn in this area ;p so not quite sure what u meant by to access the EEPROM (in the device tree) via SYSFS.
  What are the appropriate software platform I will need to install in order to do what u meant? Also how do I download the modification (done to the EEPROM) to my development board – OSD32MP1-BRK? Many thanks to u again!
- February 10, 2025 at 9:28 am #15750
  Neeraj Dantu
  Moderator
  ML,
  Please see https://www.kernel.org/doc/Documentation/i2c/i2c-sysfs.rst for an overview of I2C SYSFS. The EEPROM driver invoked by the device tree provides entries in /sys/bus/i2c/devices directory that you can interact with as files.
  The default Linux image should come with EEPROM device driver enabled. Images for BRK are available here: https://octavosystems.com/octavo_products/osd32mp1-brk/#Software/. See also: https://octavosystems.com/app_notes/osd32mp1-brk-getting-started/.
  Best,
  Neeraj
- February 19, 2025 at 5:24 am #15772
  ML
  Participant
  I follow the steps listed here https://octavosystems.com/app_notes/osd32mp1-brk-getting-started/#trouble
  But I am still unable to detect new network adapter called Remote NDIS Compatible Device though I have configured the boot switch to 101 and also saw the red LED blinking.
  I cannot find this adapter in network connection or under Other devices in the Device Manager.
  Can anyone advise me what can be done?
- February 19, 2025 at 12:53 pm #15778
  Neeraj Dantu
  Moderator
  ML,
  I would suggest trying a different USB cable(some cables only provide power).
  Also, you should be able to use a USB to UART adapter to connect to the UART interface(marked TX, RX and GND) near the SD card slot. This will allow you to use a program like Putty to open a terminal on your computer and monitor the console log output of the BRK board when it is booting. After it boots, it will also provide a console for you to type in commands like “ifconfig” to see the Ethernet configuration from the board side. An example adapter can be found here: https://learn.sparkfun.com/tutorials/sparkfun-usb-to-serial-uart-boards-hookup-guide/all.
  Best,
  Neeraj
- February 20, 2025 at 9:40 pm #15779
  ML
  Participant
  Thanks Neeraj,
  I did the following:
  Write to EEPROM:
  echo -n -e ‘\xAB\xCD\xEF’ | dd of=/sys/bus/i2c/devices/3-0050/eeprom bs=1 seek=16
  Added delay
  sleep 0.1 # Add a small delay to ensure write completion
  Tried to read the EEPROM:
  dd if=/sys/bus/i2c/devices/3-0050/eeprom bs=1 count=3 skip=16 2>/dev/null | hexdump -C
  Result:
  00000000 ff ff ff |…|
  00000003
  I expected to see AB CD EF but did not. Can you advise me what went wrong?
  - This reply was modified 1 day, 10 hours ago by ML.
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