brentr

Further testing shows that Armbian 25.2.x through the current version all run the
arecord -c 2 -r 192000 -f S32_LE test.wav
without error, PROVIDED the 6.12.12 kernel is used.
 
But, any kernel version after 6.12.12 fails.
 
Now I've just got to find out what broke in 6.12.13 🙂
 

Opened Jira issue for tracking this:
https://armbian.atlassian.net/issues/AR-2542

I will message you with a link to the image I'd like you to test with your PoE HAT.
Once you confirm the fix, I'll get it incorporated into the standard Rock Pi-S images.
( [Thought I'd be able to build the test image this weekend, but the weather here got too nice to stay inside. 🙂

I'm seeing the same thing with the newer kernels.
I'll look into it in the coming weeks and post when I know more.
Thanks for catching this.
- brent
 

Good news!
 
The updated operating points for the RK3308B-S do work.
sysbench confirms a 10% speed improvement.
But, more importantly, idle power consumption is almost halved!!!!
[from 0.39W measured previously to about 0.20W when running the CPUs at 0.85V as opposed to 0.95V]
I need to run this overnight to confirm.
 
I'll look into the other B-S silicon device tree updates soon.
 
Does anyone have ideas on how best to package this?
 
I've read the docs here:
https://docs.armbian.com/User-Guide_Allwinner_overlays/
 
but they refer to Allwinner for 64-bit arm and some of the example dirs seem to be missing.
 
Are device tree overlays supported for Rockchip?
Can anyone point to an example of their use?
 
Do we end up with a magic rk3308bs.dtbo file that one moves into an overlay to optimize performance?
 
Is there a better approach?
Does the older (B) silicon even boot with these updated (BS) operating points?
 
Attached is the latest version of the rk-3308-rock-pi-s.dtb optimized for the BS chips.
rk3308-rock-pi-s.dtb

Good news!
 
The updated operating points for the RK3308B-S do work.
sysbench confirms a 10% speed improvement.
But, more importantly, idle power consumption is almost halved!!!!
[from 0.39W measured previously to about 0.20W when running the CPUs at 0.85V as opposed to 0.95V]
I need to run this overnight to confirm.
 
I'll look into the other B-S silicon device tree updates soon.
 
Does anyone have ideas on how best to package this?
 
I've read the docs here:
https://docs.armbian.com/User-Guide_Allwinner_overlays/
 
but they refer to Allwinner for 64-bit arm and some of the example dirs seem to be missing.
 
Are device tree overlays supported for Rockchip?
Can anyone point to an example of their use?
 
Do we end up with a magic rk3308bs.dtbo file that one moves into an overlay to optimize performance?
 
Is there a better approach?
Does the older (B) silicon even boot with these updated (BS) operating points?
 
Attached is the latest version of the rk-3308-rock-pi-s.dtb optimized for the BS chips.
rk3308-rock-pi-s.dtb