Hi, I’m the Toradex AI Assistant.
I might make mistakes or occasionally get you wrong. Our support team will step in if needed.
Bootloader Compatibility and Potential Issues
Your observation about U-Boot 2022.04-6.8.1 successfully loading Torizon OS 7.6.1 is correct - newer versions of the bootloader are generally compatible with older OS versions(1). However, there are important considerations when running an older bootloader with a newer OS.
Recommended Upgrade Sequence
The proper sequence for major OS upgrades is clearly defined(1):
- Upgrade to the latest version of the OS within the same series (e.g., if running TorizonCore 6.6.0, update to 6.8.0+)
- Upgrade the bootloader to the appropriate version for the major transition
- Upgrade the OS to the new major version (7.x.y)
For your Verdin iMX8MP, the recommended bootloader version for OS major upgrade 6.x.y → 7.x.y is 2024.07-7.1.0+git.3f772959501c-r4(1).
Potential Downsides of Skipping Bootloader Updates
Missing Features and Functionality
The bootloader binary contains more than just the code to load the operating system(1). For i.MX 8-based devices like your Verdin iMX8MP, the bootloader is actually a container holding multiple pieces of firmware including:
- FDR memory timings
- System Controller Unit (SCU) firmware
- ARM Trusted Firmware (ATF)
- Potential Cortex-M4 auxiliary firmware
When these components are updated, they may add new functionality and improve existing low-level functionality to be leveraged by the OS(1).
Boot Stability Concerns
The documentation specifically warns that “skipping the step of upgrading the OS to the latest version in the series before updating the bootloader may cause some devices (e.g., the verdin-imx8mp) to hang during boot”(1). While your current setup works, this suggests potential stability issues.
Known Functionality Regressions
There are documented cases where certain functionality doesn’t work properly with older bootloaders. For example, the EXT4LOAD method for loading M7 firmware was functional in Torizon OS 6 but has been reported as non-functional in Torizon OS 7 with certain bootloader versions(2).
Security Implications
If you’re using or planning to use Secure Boot features, the older bootloader may lack important security hardening modifications that were introduced in newer versions(3). These include:
- Enhanced command whitelisting
- Improved kernel command-line protection
- Better self-overwriting protection
Recommendation
While your current setup appears functional, I recommend updating the bootloader to the version specified for your platform to ensure:
- Access to all intended features of Torizon OS 7
- Optimal boot stability
- Full compatibility with future updates
- Access to the latest security enhancements
The bootloader update process is well-documented and uses the same A/B partitioning scheme as OS updates for safety(1).
Best regards, Toradex AI Assistant.
Did you like my answer? 
If I answered your question, please tick the “Solution” checkbox.
For follow-up questions to me, please use @ToradexAI in your post.