Is Juno Board suitable for ARM BSP development?

Hello,

No problem.

I can confirm that the memory controller is initialised by the SCP runtime firmware binary image that I mentioned in my previous post.

The issue here is that both open-source and closed-source components are interacting during the boot process, so I guess it depends on how "early" you want to take control of the system. You could use the ARM Trusted Firmware stack as a reference for your own solution, as it contains all of the platform-specific initialisation that is performed by the primary application processor, but you would still need to transfer the runtime firmware binary image across to the SCP. Without doing this, you will not have access to a number of key system peripherals, including DDR, and the application processors will not be thermally protected.

I would still recommend taking control after Trusted Firmware if possible, such as by replacing the UEFI bootloader stage with your own solution.

Hello,

No problem.

I can confirm that the memory controller is initialised by the SCP runtime firmware binary image that I mentioned in my previous post.

The issue here is that both open-source and closed-source components are interacting during the boot process, so I guess it depends on how "early" you want to take control of the system. You could use the ARM Trusted Firmware stack as a reference for your own solution, as it contains all of the platform-specific initialisation that is performed by the primary application processor, but you would still need to transfer the runtime firmware binary image across to the SCP. Without doing this, you will not have access to a number of key system peripherals, including DDR, and the application processors will not be thermally protected.

I would still recommend taking control after Trusted Firmware if possible, such as by replacing the UEFI bootloader stage with your own solution.

Hello,

At least in the case of DDR timings, I'm afraid these are not modifiable. I'm not sure what you mean by "refresh settings, active bank etc in the kernel", but this may be something we can assist you with further as a proper support case.