linux-kernel - Re: [PATCH v3 30/30] gpu: nova-core: clarify the GPU firmware boot steps

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Message-ID: <39a3e4af-1674-4f7e-a4b1-c37123f5458f@nvidia.com>
Date: Mon, 9 Feb 2026 00:05:13 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Timur Tabi <ttabi@...dia.com>, Alexandre Courbot <acourbot@...dia.com>,
 "dakr@...nel.org" <dakr@...nel.org>
Cc: "lossin@...nel.org" <lossin@...nel.org>,
 "a.hindborg@...nel.org" <a.hindborg@...nel.org>,
 "boqun.feng@...il.com" <boqun.feng@...il.com>, Zhi Wang <zhiw@...dia.com>,
 "simona@...ll.ch" <simona@...ll.ch>, "tmgross@...ch.edu"
 <tmgross@...ch.edu>, "alex.gaynor@...il.com" <alex.gaynor@...il.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "ojeda@...nel.org" <ojeda@...nel.org>,
 "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
 "rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
 "bjorn3_gh@...tonmail.com" <bjorn3_gh@...tonmail.com>,
 Eliot Courtney <ecourtney@...dia.com>, Joel Fernandes
 <joelagnelf@...dia.com>, "airlied@...il.com" <airlied@...il.com>,
 "aliceryhl@...gle.com" <aliceryhl@...gle.com>,
 "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
 "gary@...yguo.net" <gary@...yguo.net>, Alistair Popple <apopple@...dia.com>
Subject: Re: [PATCH v3 30/30] gpu: nova-core: clarify the GPU firmware boot
 steps

On 2/8/26 8:24 PM, Timur Tabi wrote:
> On Sun, 2026-02-08 at 18:22 -0800, John Hubbard wrote:
>>>> Looks like you accidentally deleted the "if mbox0 != 0" test.
>>>>
>>>
>>> OK, I've added it back in for the next version:
>>> ...
>>
>> ah, *correction*, I spoke too quickly. The reason I removed any
>> such checks at some point is that they are wrong. This mailbox
>> contains the libos address after boot, not an error code.
>>
>> Open RM also does not check.
> 
> Hmmm.... I guess I'm reading the code wrong, but my understanding is that if mbox0 still
> contains the libos address, then it means that the firmware didn't boot at all.

If that were true, then I wouldn't be able to boot Ampere and Blackwell,
but they both work cleanly with this patchset.

> 
> I will double-check.

thanks,
-- 
John Hubbard