[Server-devel] constant power "add-tag CP" fails on XO-4?
quozl at laptop.org
Tue Feb 25 22:56:28 EST 2014
The CP tag failure has been fixed and will be included in any new
release of Open Firmware.
It was indeed a bug.
Instead of setting the CP tag in the embedded controller (EC), 128
bytes of invalid data was written instead.
The EC just ignored the invalid data and behaved as if the CP tag
The bug would only trigger if the EC had not been reprogrammed since
power was applied. This is why ?sync-ec or deleting and adding the
tag again would fix it.
http://dev.laptop.org/ticket/12751 has the technical details.
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