Re: [PATCH v3] x86: i8237: Register based on FADT legacy boot flag
From
Alan Cox <>
Date
Mon, 26 Mar 2018 15:55:16 +0100
> Can we probe safely for this device?
99% of the time yes the inb gives us a straight answer. However (and we've hit this with port 0x81 for real) there are concerns that some systems will trap those addresses into SMM and do weirdness that makes the 0xFF check fail.