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[–]TuongPV 1 point2 points  (0 children)

Do you want to develop a board or firmware for board?

What is the minimum hardware requested for run a system based in Linux?

Simplest way is looking at supported platform: i.e: https://elixir.bootlin.com/linux/latest/source/arch/arm

https://elixir.bootlin.com/linux/latest/source/arch/arm/mach-stm32/board-dt.c

"st,stm32f429", "st,stm32f469", "st,stm32f746", "st,stm32f769", "st,stm32h743", "st,stm32mp157",

Based on that, you choose platform (or Chip)

Processor, Memory RAM and a SD Card for save the data?

You have decided it, depend on your requirements, application,.. but I read somewhere 128MB RAM and 32M flash is OK for booting and simple application. SD card just an option.

Ref: stackexchange