@yifanlu, hey, good point! So I could disable the console in inittab and not really lose anything (I use ssh over usbnet)? Hopefully the u-boot output wouldn't confuse the freshly-started GPS module during boot.
@seaniko7, do you mean internally or externally? I am hoping to fit this inside the Kindle in the space normally occupied by the 3G card (I have the wifi-only model). I could potentially get USB from the mini-pcie connector pads, but usb-serial inside the case would add space and complexity.
I'm still curious about all those TPs. Wish someone would leak a schematic
I'm looking for a good place to piggyback I2C also. (Leading contender thus far is the WM8960 codec.)