linux-kernel - Re: [PATCH v3 2/2] gpu: nova-core: add boot42 support for next-gen GPUs

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Message-ID: <f2301249-1a92-489a-b1ad-2e174980297c@nvidia.com>
Date: Wed, 29 Oct 2025 16:15:01 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Timur Tabi <ttabi@...dia.com>, "dakr@...nel.org" <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>,
 "lossin@...nel.org" <lossin@...nel.org>,
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Subject: Re: [PATCH v3 2/2] gpu: nova-core: add boot42 support for next-gen
 GPUs

On 10/29/25 8:02 AM, Timur Tabi wrote:
> On Tue, 2025-10-28 at 20:03 -0700, John Hubbard wrote:
>> NVIDIA GPUs are moving away from using NV_PMC_BOOT_0 to contain
>> architecture and revision details, and will instead use NV_PMC_BOOT_42
>> in the future. NV_PMC_BOOT_0 will be zeroed out.
> 
> I don't think this is correct.  ARCH_1 in PMC_BOOT_0 will be set to 1 in future GPUs.

ah right, thanks Timur! I can change it to:

NV_PMC_BOOT's ARCH_0 (bits 28:24) will be zeroed out, and ARCH_1 (bit 8:8)
will be set to 1, which means, "refer to NV_PMC_BOOT_42".


thanks,
-- 
John Hubbard