I ask, because I have an Epic4G. I've scrutinized the various publicized teardown photos of its board, and I have yet to find anything that looks like it might be this chip (which would almost certainly be either MLF or microBGA, 3mm x 4mm or larger, and located somewhere between the main processor and the USB port).
By the same token, does a readily-available (though not necessarily "public", if you know what I mean) datasheet for the Hummingbird and its support chips exist somewhere that documents things like how many UARTs it has, which pins they're connected to, how they're configured (baudrate, parity, mode, stopbits, input & out put registers, interrupts, etc)?
As far as I can tell, Android itself has no concept of a UART, and everything in the (official Samsung) kernel that's UART-related was omitted, so there's no documentation in there.
I'm personally psyched about the existence of a UART on this phone, because it opens the door for external peripherals that are a half step above "homebrew" -- things like game controllers, folding keyboards, etc. Stuff you COULD sort of implement via bluetooth (if we ever get a kernel that knows how to do HID), but would literally cost half as much and get twice the battery life if you could skip the bluetooth and just connect via a pair of wires instead.
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