As far as we know, the Dual-Parallel QSPI does not work on the Rev B boards and should not be relied on. Booting from Dual-QSPI on the Rev B board should hang. Please open the PS Configuration Wizard in VIvado and make sure you have indeed enabled the Dual-Parallel mode for the Rev B design.
Hi,
Thanks for the quick reply. The Zynq PS is indeed enabled with dual-QSPI (screenshot below). We are also able to burn bitfiles > 16MB and verify successfully using the Xilink SDK Flash tool in dual-parallel QSPI mode. Further, we can write and read-verify up to 32MB of space in Linux, if booting Linux on the Zynq and mounting QSPI as a file-system. Since the individual flash chips are 16MB in size, this implies dual QSPI must be working.
Are you able to suggest a test that you expect to fail on the RevB boards for us to try?
Many thanks,
Simon
I have not seen it ever work on the Rev B board, so we do not recommend it.
Hi, thanks for your suggestion on not using RevB for dual-flash mode. Can you please outline for us what changes were made between RevB and RevC?
From the schematics, it seems there were no changes relating to the flash and we'd like to understand the suitability of our existing MMP units for use in our products.
Changes were made to the Rev B PCB routing to correct the Dual-Parallel QSPI operation. The Rev B and Rev C schematics are identical.