On 10/6/2020 8:19 AM, Borislav Petkov wrote:
On Mon, Oct 05, 2020 at 02:35:58PM -0700, Mike Travis wrote:
On 10/5/2020 2:21 PM, Borislav Petkov wrote:
On Mon, Oct 05, 2020 at 03:39:22PM -0500, Mike Travis wrote:
A patch to add and process the UV Arch Type field in the UVsystab passed
from UV BIOS to the kernel.
What does that mean?
There have been recent cases where OEM's want to use the OEM_ID in the ACPI
tables to brand their own product. The UV BIOS used that field to tell the
Linux kernel which UV arch the running system is. The Arch Type in the
UVsystab (also created by UV BIOS) now carries that field in systems that
support it.
I am unclear on the whole patch passing from UV BIOS to the kernel. Are
you talking about a kernel patch here? If so, commit ID is? Or what kind
of patch are you talking about?
When the UV BIOS starts the kernel it passes the UVsystab info struct to
the kernel which contains information elements more specific than ACPI,
and generally pertinent only to the MMR's. These are read only fields
so information is passed one way only. A new field starting with UV5 is
the UV architecture type so the ACPI OEM_ID field can be used for other
purposes going forward. The UV Arch Type selects the entirety of the
MMRs available, with their addresses and fields defined in uv_mmrs.h.
Thanks,
Mike
