Proposed communication protocol between Host and EC for 1.75

John Watlington wad at
Wed May 26 19:38:11 EDT 2010

On May 25, 2010, at 10:38 AM, Richard A. Smith wrote:

> On 05/24/2010 11:03 PM, Mitch Bradley wrote:
>> Another protocol idea is at
> The SPI interface on the CPU is shared with the SPI boot flash.  So on 
> boot the CPU has to be master and then switch over to slave when the 
> boot it finished.  To use this setup  we will also have to negotiate a 
> master slave switch when the CPU wants to change mfg data or when it 
> wants to update the firmware.

Not quite true, as there are additional SPI interfaces available through
the SSP ports.


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