Hi Andrey,
On 23-09-05 09:27, Andre Przywara wrote:
On Mon, 4 Sep 2023 23:54:30 +0300 Andrey Skvortsov andrej.skvortzov@gmail.com wrote:
Hi Andrey,
When using SCPI as the PSCI backend, firmware can wake up the CPUs and cluster from sleep, so CPU idle states are available for loaded OS to use. TF-A modifies DTB to advertise available CPU idle states, when SCPI is detected. This change copies nodes added by TF-A to any new dtb that is used for loaded OS.
Why do you need that, exactly? Why not just use $fdtcontroladdr for the kernel? We now keep the U-Boot copy of the .dts files in sync with the kernel. If you need to modify the DT in U-Boot, for instance by applying overlays, you can copy that DTB into a better suitable location first: => fdt move $fdtcontroladdr $fdt_addr_r
In any case, there shall be only one DT, that one in the U-Boot image. Why do you need to load another one for the kernel?
extlinux is used by distributions (sometimes with device-specific changes especially for platforms not fully supported by mainline yet), then U-Boot loads DT defined in extlinux.conf file. u-boot scripts are not used in case of extlinux at all.