I'm working with the i.MX7 Dual, on the reference sabre board, running buildroot linux based on the fslc 4.1.15 2.0.0 GA release.
What are the correct pad settings for the ECSPI pads? Right now I have 0x2 in the pad control registers, which translates to the following:
* 100K PD
* Pull Disabled
* Hysteresis Disabled
* Fast Slew Rate
* Drive Strength X2
This seems to yield some really sloppy looking waveforms, with everything rounded off. It may be a problem on my board, or the connection to the (external) SPI slave, but I wanted to check what the expected settings should be.