Have you set the VIO4 voltage levels also as 1.8V (The power domain that supports SPI Block).
In please check if there is any noice over the SPI Lines (which might dominate the actual data signals at 1.8V)
Yes the VIO4 is connected to 1.8V only. Now we found a workaround with pulldown for MISO line which is allowing us to boot over SPI flash. Can you please elaborate on the noise over SPI line & its threshold (if any) ? Are you mentioning about power noise VIO4 ?
Yes, I was mentioning about the power noise of VIO4.
- Madhu Sudhan