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Do you take external DDR RAM on an application-class ARM core? You're an MPU. There's a blurry line sometimes, but Application-class (Cortex A* cores, like A5,
by dragontamer 3y ago
Do you take external DDR RAM on an application-class ARM core? You're an MPU.
There's a blurry line sometimes, but Application-class (Cortex A* cores, like A5, A35, etc. etc.) are solidly MPU. Not even close.
- eqvinox 3y ago> Do you take external DDR RAM on an application-class ARM core? You're an MPU. The actual difference IMHO is the existence of an MMU. (Which is, fdpic/linux-nommu efforts notwithstanding, the general "Linux" condition.) (Ex.: the SOPHGO SG2000 RISC-V chip comes with integrated DDR3 RAM, but is still solidly an MPU. I believe there are some ARM Cortex-A with integrated RAM too, can't think of any off the top of my head. [Ed.: nevermind, the SG2000 is dual RISC-V/ARM])
- bpye 3y agoNuvoton have some ARM9 parts with integrated DRAM for example [0]. It’s a little outdated but this blog post is a pretty good overview of the options available [1]. [0] - https://www.nuvoton.com/products/microprocessors/arm9-mpus/ https://www.nuvoton.com/products/microprocessors/arm9-mpus/ [1] - https://jaycarlson.net/embedded-linux/ https://jaycarlson.net/embedded-linux/