NVIDIA appears to be gearing up for software support for "Rubin", the architecture expected to succeed "Blackwell", after a set of driver patches introduced a new identification register called BOOT_42. The initial patches landed on public mailing lists late on a Friday and include a change titled for next-generation GPUs. In the patch cover letter, NVIDIA engineer John Hubbard explains that architecture and revision metadata will transition from NV_PMC_BOOT_0 to NV_PMC_BOOT_42, with BOOT_0 being cleared. These updates were submitted to the Nova kernel driver tree, which is serving as the public platform for this early work. The patches adjust the detection path so the driver can recognize devices from Turing onward using the new register layout.

The submission also adds comments that document how BOOT_0 and BOOT_42 evolve across GPU generations, and it removes a couple of legacy types, Spec and Revision. According to the notes, this simplification removes some complexity and makes future boot42 support updates easier to follow, avoiding generation-specific adjustments when new revisions arrive. The changes confirm that current generations from Turing through Blackwell will continue to use BOOT_0 while future, post-Blackwell chips will be identified solely via BOOT_42. Targeting Rubin, this work is another example where NVIDIA is actively preparing driver support ahead of hardware launch. If Rubin enters volume production in the second half of 2026 as previously reported, having the identification and selection logic ready in advance should help reduce the gap between shipments and software enablement, meaning that fast-moving hardware release cycles will be followed very closely with optimized software.