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Bios driver development, steps and debugging

Hi, I would like to develop Bios drivers for dm8168evm, particularly serial interfaces such as spi. so I would like to know if there are some steps or recommendations Ti experts can give for this?

Also I would like to know where I can get dm8168 soc register definitions?

And the last one is how can I get low level debug information from DSP? Either it is directly or through arm processor, so I can inspect and identify the causes that makes a dsp-side process to hang.

I would appreciate some help on this, thanks.

- Jose L.