Messages in this thread | | | Subject | Re: [PATCH v3] x86: i8237: Register based on FADT legacy boot flag | From | Alan Cox <> | Date | Mon, 26 Mar 2018 15:52:33 +0100 |
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> Please explain WHY 2017 is the cut-off date. I still have no clue how > that > is decided aside of being a random number.
Because if it's prior to 2017 then it'll almost certainly have those registers even if the firmware says otherwise. After that point we think the firmware is going to give valid answers (although the 0xFF check is actually the important one in reality).
Alan
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