Hello,
I am new here, so this may be a really dumb question.
Is it possible to get a simple Android tablet to boot on the SD card
as an Arduinio device?
In other words. create a SD FLASH that that boots the tablet with
Arduino firmware running?
Then it would basically be an Arduino tablet?
No, there is no arduino firmware (except the bootloader, but all that can do is write stuff on serial from flash).
When you write arduino sketches, they are all that's running. There's no additional firmware, there is no operating system.
Also, an arduino tablet would make no sense - arduino is good for manipulating hardware at a low level, but you have no GPIO's on a tablet, nor any serial port. Additionally, there is no support for the sort of high-end microprocessors used in cell phones and tablets, nor any (or at least most) of the peripherals. Compare the clock speed, ram and flash on that tablet (1-2 ghz, 1-4GB, 4-64GB respectively) to that of the platforms that Arduino is meant to work with (16mhz, 2k and 32k respectively for the most common) That is to say, an android tablet has about a million times more ram and flash than an Arduino board, and is clocked 100 times faster.
If you spent a bit more time working with Arduino, you'd quickly see why this idea wouldn't make much sense.
People have absolutely made things with arduino-compatible processors and touchscreens, and packaged them so they're tablet shaped - that's nothing special - but that's not really what you're asking, and what you're asking is both nonsensical and impossible (at least with vaguely sane amounts of work).