Board Bring-Up

FlexSPI + QSPI NOR on the i.MX RT1062: Configuration and Verifying Max Speed

How I configured FlexSPI for a Winbond W25Q128JV, measured 518 Mbps read (97% of theoretical), and why the write measurement that looked great was actually a bug in my busy-poll loop.

i.MX RT1062 Pin Config: Pull/Keeper, Drive Strength and Slew Rate

What each IOMUXC pad-control field actually does, how to derive the right value from the schematic instead of trusting the config tool’s defaults, and the SD-card bug those defaults caused on my board.