> Is there anyone shipping an ARM motherboard and ARM chip? I think the "openness" is also defined by what the market offers. All I see are non-extendable notebooks.
Pretty much all ARM application processors use soldered BGA packages over sockets, and there also isn't the same tradition of defining a standard pinout for a generation or two (or five) of chips like there has been for x86 (e.g. LGA1151, AM4, etc.).
You can't really design a motherboard without this, so each design tends to have a custom breakout board or carrier card that's designed to be used in relatively specific installations.
Pretty much all ARM application processors use soldered BGA packages over sockets, and there also isn't the same tradition of defining a standard pinout for a generation or two (or five) of chips like there has been for x86 (e.g. LGA1151, AM4, etc.).
You can't really design a motherboard without this, so each design tends to have a custom breakout board or carrier card that's designed to be used in relatively specific installations.