Nouveau - Oct 2025 - [PATCH v3 2/2] gpu: nova-core: add boot42 support for next-gen GPUs

On 10/29/25 5:31 PM, Timur Tabi wrote:
> On Wed, 2025-10-29 at 17:29 -0700, John Hubbard wrote:
>> That, combined with Timur's comment, made me realize that
.is_next_gen()
>> can be made reliable enough that we don't even need is_nv04() at
all.
> 
> Please, not "next gen".  Technically speaking, BOOT42 is
"current gen" and BOOT0 is "last gen".
> 
> And this all assumes that BOOT42 won't be replaced by something even
bigger for
> Blackwell+++++++++++.
OK, I think this wants to be called use_boot42_instead(), approximately.

...and I've fortified the code accordingly:

impl NV_PMC_BOOT_0 {
    pub(crate) fn use_boot42_instead(self) -> bool {
        // "Future" GPUs (some time after Rubin) will set
`architecture_0`
        // to 0, and `architecture_1` to 1, and put the architecture details in
        // boot42 instead.
        self.architecture_0() == 0 && self.architecture_1() == 1
    }

thanks,
-- 
John Hubbard

On Wed, 2025-10-29 at 17:35 -0700, John Hubbard wrote:
> ??????? // "Future" GPUs (some time after Rubin) will set
`architecture_0`
> ??????? // to 0, and `architecture_1` to 1, and put the architecture
details in
> ??????? // boot42 instead.
I don't want to kick a dead horse here, but aren't the architecture
details already in boot42
for Turing?  I thought the whole point was that we don't need boot0 any
more, and only Nouveau
has to worry about boot0 vs boot42.