CM3-bootloader: Configure Pin 0 and 1 for HAT EEPROM

[zhan-kunbus]

Describe the bug
The HAT EEPROM works not with CM3 without pin defines in dt-blob.bin

Expected behaviour
The HAT EEPROM works with CM3 without extra configurations like that on CM4(s)

System

• Which model of Raspberry Pi? CM3
• Which OS and version (cat /etc/rpi-issue)? Raspberry Pi reference 2022-01-28
• Which firmware version (vcgencmd version)? Dec 1 2021 15:07:06
• Which kernel version (uname -a)? 5.10
  However, as the pin configuration are implemented in the bootloader, the OS and kernel version should not be relevant.

Here I would like to ask whether it's planned to support HAT EEPROM in bootloader for CM3. If yes, would like to further know when that would be possible.

[pelwell]

The current behaviour is by design. CM3 is a very flexible platform, and there is no expectation that it would be used in conjunction with HATs, or even that GPIOs 0 & 1 would be used for I2C of any kind.

[zhan-kunbus]

thanks a lot for the answer.