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I have looked at the following two websites for searching Raspberry Pi.

https://www.raspberrypi.com/

https://orangepi.com/

Our requirement is to have 100 Mbit/s Ethernet RJ45, I2C, SPI and some GPIOs.

I have found Raspberry Pi Model B+ and Orange Pi Zero. They do have 100 Mbit/s Ethernet RJ45 but I am not sure if they also have I2C and SPI.

Is there exist Raspberry Pi with 100 Mbit/s Ethernet RJ45, I2C, SPI and some GPIOs ?

A general question on Raspberry Pi, do we have access to the schematic of the development boards of Raspberry Pi that can be used as a reference design to add/implement Micro Processor with peripherals in the custom design hardware ?