Messages in this thread | | | From | Thomas Renninger <> | Subject | Re: [PATCH 1/4] ACPI: Provide support for ACPI table adding via OS | Date | Tue, 18 Feb 2014 19:44:26 +0100 |
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On Tuesday, February 18, 2014 10:27:23 AM H. Peter Anvin wrote: > Why can't you add SSDTs? It would be particularly useful.
There are 2 ways how ACPI tables get added: - Via pointer from a root table (XSDT or RSDT iirc) - Via load statement inside of ACPI context when ACPI BIOS code gets executed (iirc the physical address is passed).
The latter is only for SSDTs. The problem is that you if you add an SSDT early, it might have been intended for overriding when an SSDT gets dynamically loaded later when the system is up which is particular useful as well if you want to debug this specific BIOS table.
This could be workarounded via a boot param: acpi=allow_ssdt_adding But this is not nice. Maybe someone has a more elegant idea. Something could still be added if someone is really needing this.
Thomas
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