Messages in this thread | | | Date | Sun, 16 Dec 2007 13:42:07 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override. |
| |
Rene Herman wrote: > > Well, I suppose. With stuff inline, constantly reloading dx also bloats > things up a bit but yes, out of line who cares. Do you think this > version is better? >
It probably comes down to which version is bigger (you probably also want to try uninlining.)
>> In the boot code, io_delay() is used to slow down accesses to the KBC, >> interrupt controller, INT13h logic, and the NMI gate, and to provide a >> fixed delay during A20 stabilization. > > Thanks for the heads up (also saw the SMBIOS update to this) but those > don't seem to be a problem in fact. David Reed has been running with the > simple udelay(2) version of this and reported no more hangs. He moreover > reported no trouble after booting with "acpi=off" meaning that things > seem to be fine pre-acpi which the boot code (and this io_delay_init) > is. So I believe we get to ignore those.
Okay, so there is something inside ACPI which tickles this. Which brings further credibility that it's activating a debugging hack, probably inside the SuperIO/system controller chip.
It would be interesting to know exactly which part of ACPI triggers this. I bet it is a reference to system controller namespace.
-hpa
| |