LineageOS does not boot on Hackberry with newer CM5 EEPROM (2025) versions

[mcdbcherry]

I am using Hackberry with a Raspberry Pi Compute Module 5 Lite (CM5 Lite).

LineageOS for Hackberry (microSD boot) used to work without issues.
However, after booting into Raspberry Pi OS and performing system updates,
LineageOS no longer boots.

Current behavior:

• When booting with the LineageOS microSD, the CM5 LED stays solid (no blinking)
• It seems the bootloader does not hand off to the OS
• Raspberry Pi OS still boots normally from microSD

To investigate, I checked the EEPROM state from Raspberry Pi OS:

• CURRENT: November 2025
• LATEST: December 2025
• Raspberry Pi OS update was executed in March 2026

This suggests that the CM5 EEPROM is now using a 2025-era bootloader.

My assumption is that Hackberry’s LineageOS image depends on
older CM5 EEPROM behavior (2023–2024 era), especially regarding:

• DSI initialization order for the built‑in display
• SD boot priority
• PCIe initialization timing
• Other early‑boot hardware sequences

Newer EEPROM versions (2025+) may have changed these behaviors,
causing LineageOS to fail during early boot, while Raspberry Pi OS
continues to work because it fully supports the newer EEPROM.

If possible, I would like to know:

1. Which EEPROM versions are officially supported by the current LineageOS image
2. Whether there are plans to update the LineageOS kernel/DTB to support newer EEPROM versions
3. Whether any patches or configuration changes exist to make LineageOS compatible with 2025+ EEPROM behavior

Any guidance would be greatly appreciated.