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Payment terminal Hardware board

We wish to get an off the shelf hardware before designing a custom hardware for a payment terminal.The major requirements are:

  • ARM Cortex-Ax core running at around 1GHz
  • Support for >= 1GB RAM
  • Connectivity – Ethernet, USB Host, UART, SPI, SD Card
  • Hardware accelerators for cryptographic functions – AES, DES, SHA, RSA-2048 and others
  • Availability of SOM (preferred)
  • Availability of Android and/or Linux port 

plz. suggest any suitable hardware for the same.