5/26/2021 1:30 PM | |
Joined: 4/28/2015 Last visit: 6/10/2024 Posts: 11 Rating: (0) |
Hi Jan, Did you maybe check is there any problem with building u-boot image. |
5/27/2021 7:54 PM | |
Joined: 4/28/2015 Last visit: 6/28/2024 Posts: 578 Rating: (43) |
In our setup, U-Boot loads the kernel DT from the rootfs. The DTs are widely aligned but not technically identical. Therefore, you could define what the kernel should use by updating /usr/lib/linux-<version>/... (paths differ between downstream and upstream kernels). Now, the problem is that this U-Boot patch - even if it would allow setting something upfront during boot - is not used on our hardware. We have a separate first-stage loader on the R5 cores, not U-Boot. Also, I don't think what is set there is actually the core frequency, likely rather its timer rate. See also https://github.com/u-boot/u-boot/commit/ea3f5348063ebe4f41be7d1ba3ef0afe56a04a40. What you could try is if offlining some CPU cores or disabling unused devices helps to bring down the temperature a bit. But power management is not in good shape with this revision of the SOC. The next one (SR2.x) will be better, but I have no exact data on how much in °C. |
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