Hi Pavel,
As far as I know, in the M3 vps source codes, there is a vpdma firmware loaded like in uboot. And I know that if we want to stop vpdma send, we can write (1 << 20) to VPDMA_LIST_ATTR register.
So, I think we can display the logo continuously, and we can control the uboot interact with M3 firmware.
But, how can I do to achieve it? Modify the vpdma firmware or some registers? Please tell me, thank you!