MNT Reform Motherboard 3.0 D-2

Changes (2.5 to 3.0 D-1):

• barrel jack replaced with usb-c power delivery input (via firmwareless TPS25730)
• usb-uart chip added that offers cpu debug consoles and system controller debug uart on that same usb-c port (CY7C65215)
• old 5V and 3V3 main buck converters replaced with modern ones from reform next (LM62460)
• direct power input header added for custom power solutions like solar
• NVMe SSD slot bumped from 1x to 4x PCIe lanes (for RK3588)
• PCIe reference clocking chip updated for PCIe Gen 3 support
• headphone jack detection fixed (resistor update)
• LTC4020 charge current overdraw fixed/limited
• 5V power rails for USB redone for higher current and increased capacitance to handle more USB device power draw
• USB hub upgraded to TUSB8041 from TUSB8040
• unnecessary internal 5v and 3v3 power switches removed
• added QwiiC port for I2C expansion via LPC (for example for sensors)
• added QwiiC port for I2C expansion via CPU
• SD card slot model replaced (old one is no longer produced)
• 1V8 LDO updated for more modern one
• some unnecessary/unused resistors, signals, headers removed
• improved/redrew some routing and ground fills

Changes (3.0 D-1 to 3.0 D-2):

• fix LPC->USB UART rx/tx crossing
• fix USB UART USB data lines crossing
• replace 3V3 LDO for USB UART with buck converter, got too hot at 20V input