RE: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter description

[Wan, Vincent]

> > +	ivrs_acpihid	[HW,X86_64]
> > +			Provide an override to the ACPI-HID:UID<->DEVICE-ID
> > +			mapping provided in the IVRS ACPI table. For
> > +			example, to map UART-HID:UID AMD0020:0 to
> > +			PCI device 00:14.5 write the parameter as:
> > +				ivrs_acpihid[00:14.5]=AMD0020:0
> 
> What is that parameter needed for? Can't you deduce the mapping from the
> hardware?

It is very like ivrs_ioapic/ ivrs_hpet, which can override the dedicated BDF id mapped to HID:UID that was reported from BIOS's IVHD entry.
If BIOS did not report a right BDF, we can resort to this parameter to correct it.

> 
> --
> Regards/Gruss,
>     Boris.
> 
> ECO tip #101: Trim your mails when you reply.