Radxa Cubie A7A/A7Z - Allwinner a733

[Sand_Death]

@alexc

I tested the modified kernel and asked Claude to report it, he reported it like this.

System Refinement and Build Optimization Report

Feedback

1. MSI Fix Confirmed Working

Details: The MSI fix has been verified and successfully tested on Hailo8L (sun60iw2/A733 platform).

Result: Massive reduction in system load: load avg dropped from 18+ to ~12, and Frigate CPU usage plummeted from 485% to 83% during real-world inference.

High Priority

2. sunxi-autogen.h in .gitignore

Issue: This file is currently ignored by .gitignore, yet it is strictly required for the build to succeed and is not automatically generated.

Solution: Either implement automatic generation of this file inside the Makefile OR properly document the creation steps in the README.

3. Undocumented LOCALVERSION Behavior

Issue: Building from a dirty Git tree automatically appends a + suffix to the kernel version string, leading to a critical vermagic mismatch for compiled modules.

Solution: Document this behavior in the README or enforce proper default behavior in the default configuration file.

Medium Priority

4. Missing BSP_TOP Export

Issue: Running make olddefconfig crashes unless BSP_TOP=bsp/ is explicitly passed as an environment variable.

Solution: Add path auto-detection directly into the root Makefile to make the build self-contained.

5. Missing DKMS Config for hailo_pci

Issue: Since this is an out-of-tree module, users must manually rebuild it after every routine kernel update.

Solution: Provide a DKMS configuration to automate the rebuild process on the OS level.

Low Priority

6. hailo_pci Driver Integration in initramfs

Issue: The module is not automatically included in the initramfs image during the build phase.

Solution: Create a dedicated hook script or add a section in the documentation explaining manual configuration via modules-load.d and update-initramfs.

7. Overly Permissive /dev/hailo0 Permissions (World-Writable)

Issue: The device node permissions are set to crw-rw-rw- (anyone can write to it), which poses a security risk.

Solution: Deploy a standard udev rule to restrict permissions and grant access safely via a dedicated system group.

 

!!! At the moment, I confirm that it works with these edits.

[alexc]

@Sand_Death

Really interesting read! Would it be possible to submit these changes through GitHub or as a kernel patch? We'd love to see the full context of the changes—the code actually provides such a clear picture of what's happening (even more so than the docs!), so a proper review of the diff would be great.

 

EDIT: Looking at the description, it seems Claude addressed the issue on the Hailo driver side rather than fixing it in the PCIe driver. Personally, I don't think that's the ideal approach, since the BSP PCIe driver appears to be the root cause. If you get a chance to try my patch instead, I'd be interested to hear how it works for you.

Edited 2 hours ago by alexc