[Bug]: FriendlyARM NanoPC T4 DDR unstable

[msdos03]

What happened?

FriendlyARM official system images all run fine.

"memtester" in armbian and mtest in u-boot don't report any error, but when I am using a browser or running a java virtual machine, it crashes frequently. After some tests on the u-boot, I found the issue is related to RAM.

If I use 800MHz DDR blob or modify rk3399-nanopc-t4-u-boot.dtsi in u-boot to include rk3399-sdram-lpddr3-4GB-1600.dtsi instead of rk3399-sdram-lpddr3-samsung-4GB-1866.dtsi , The problem is solved.

That make sense to me because FriendlyARM official system images are all using 800MHz DDR blob.

So, I suggest change the DDR blob to 800MHz one, or switch to blobless and add a patch to apply the mentioned modification.

How to reproduce?

It is hard to reproduce on other boards because the RAM chips and board revision are diffrent. On my board, installing java and run a large program or browsing the internet for a while can reproduce the problem.

Branch

main (main development branch)

On which host OS are you running the build script and observing this problem?

Ubuntu 24.04 Noble

Are you building on Windows WSL2?

• Yes, my Ubuntu/Debian/OtherOS is running on WSL2

Relevant log URL

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

Jira ticket: AR-2594

[mr-toolcraft]

While this issue tracker is officially for framework problems only (building Armbian to say), I'd say to leave it here for now since ideally OP could provide a PR with the mentioned changes and link this issue.

Did you try both ways blobless and with the 800 blob?

[msdos03]

While this issue tracker is officially for framework problems only (building Armbian to say), I'd say to leave it here for now since ideally OP could provide a PR with the mentioned changes and link this issue.

Where should I place this issue?

Did you try both ways blobless and with the 800 blob?

Yes, I've tried both ways, they both work fine. Note that we need to patch rk3399-nanopc-t4-u-boot.dtsi in blobless.