Kernel debug over SPI - check point part1-3

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Uploaded by on Nov 22, 2009

using SAMEDISK's special SPI 86 87 command to output check point (debug message), this is a good solution for that system lacking of output method (such as new platforms in lagecy free ), or hardware design fail, others are platform in a very small form factor, without exta reserve space for debug interface. Another advantage is SPI flash will be boot in the early stage, therefore it is possible to debug in SEC stage, as USB debug cable will not be able to debug if USB host has not yet being initialed.

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