I am currently working on boot time diagnostic software for Beagle Board - xm it is just like POST ( power on self test ) what we have in BIOS systems , So as we know during early stage there is no driver present so that i came to know that i have to write a basic low level driver for the peripherals, but my question is what kind of test should be performed in boot time whether it is limited to basic read/write ( in case of my devices like i2c & spi) or i need to perform test for each and every functionality of the peripherals. So i just want to know what kind of tests are conducted or what kind of steps are followed for I2c & SPI during a boot time diagnosis .
I2C & SPI Power On Self test
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Usually devices like I2C and SPI have default values of some registers according to their documentations. At boot time you can read from your diagnostic procedure all I2C/SPI peripheral devices and check obtained data. If you can read (default for reset or even better - read only constants) and determine they are correct, that means these parts are OK at this stage.