The following are the changes for the hardware.

R0.1
1. Initial release.

R0.2
1. Switch from ECP5 to SPARTAN6 FPGA

R0.3
1. Remove on-board 39pin/ 50pin connector, switch to 40pin connector or EPD
2. Remove DSI input connector
3. Add DisplayPort to LVDS bridge chip and DisplayPort input

R0.4
1. Use Type-C input instead of full-size DisplayPort port

R0.5
1. Switch from MAX17135 PMIC to TPS65185 PMIC
2. Switch to a different TypeC connector model
3. Added global current limit

R0.6
1. Switch to individual DCDCs for Eink power supply

Lite R0.1
1. Use DVI TMDS input in place of Type-C input and DP bridge
2. Use DCDC instead of charge pump + zener diode for lower Iq
3. Add user button
4. Add VCOM measure capability
5. Add RP2040 SWD connector

R0.7
1. Import DVI TMDS input, newly revised power supply and user button from RL0.1
2. Connect FPGA to RP2040's hardware SPI
3. Fix USB Type C mux connection