Why are there two ranges here: reg = <0x0 0xff0f0000 0x0 0x1000 0x0 0xc0000000 0x0 0x8000000>;?

targets -set -nocase -filter {name =~ "*PSU*"}; stop; mwr 0xff5e0200 0x0100; rst -system

1. Upon reset, the device mode pins are read to determine the primary boot device to be used: NAND, Quad-SPI, SD, eMMC, or JTAG.

Look at the schematic to see which MIO UART TX and RX are connected to. Consult this table. Find the corresponding  VCC_PSIO pin and what vo