02-04-2019 04:18 PM
I am new here. I wonder whether there is a way to boot the PS from the PL. I know this sounds dumb. PL is always configured after PS. It seems after configuring PS, the PL logic will automatically be reset.
Just want make sure. Or is there some other trick way to do this.
Thanks in advance.
02-04-2019 04:34 PM
Upon power-up, there's nothing in the PL; until the PL gets programmed, it's an ocean of cleared-out configuration bits that provides zero functionality.
So if by "boot the PS" you mean do an initial, power-up boot using the PL somehow, then that's a negative.
If you instead mean 'reboot' the PS (after initially booting using a more conventional method) by downloading an updated image over an interface that's only available through the PL, then that's something you can probably get working.
02-20-2019 08:44 AM
Thanks, jg! The second one is something that I am thinking about. Could you please elaborate a little bit more about it?
02-20-2019 09:28 AM
The latter situation would be one where your Zynq would normally boot completely from a local medium (QSPI, SD, EMMC, etc.) and then download an updated boot image using a pathway that goes through the PL (e.g., an PSU GEM Ethernet interface that couldn't use MIO resources). That downloaded image would then get committed to the local boot medium, and then the system would initiate a re-boot.
Another situation would be that your initial boot would only program the PL with minimal logic to download a larger image (once again, perhaps just that one Ethernet interface) and the larger downloaded image would then be used to complete the boot and (most likely) re-program the PL.