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
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