Lichee Pi 4A is a high performance RISC-V linux development board using Lichee Module 4A, based on the TH1520 SoC. It contains 4TOPS@int8 AI NPU, supports 16GB LPDDR4X memory and 128G eMMC storage, supports dual 4K resolution screen display, supports 4K mipi camera input, dual POE Gigabit Ethernet ports and multiple USB interfaces. There is an extra RISC-V C906 Core for audio decode.
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Adafruit Blinka Installation
We use a special library called adafruit_blinka (named after Blinka, the CircuitPython mascot) to provide the layer that translates the CircuitPython hardware API to whatever library the Linux board provides.
For example, on Raspberry Pi we use the python RPi.GPIO library. For any I2C interfacing we'll use ioctl messages to the /dev/i2c device. For SPI we'll use the spidev python library, etc. These details don't matter so much because they all happen underneath the adafruit_blinka layer.