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boot: back to LTS kernel (6.18), NPU/FLM caveat documented

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Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
Sergei Poljanski 2026-10-03 21:35:52 +04:00
commit 2b9b333f24
Signed by: asxpi
GPG key ID: 4F8851660FA4121B
1 changed files with 7 additions and 4 deletions
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11
modules/boot.nix
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@ -2,10 +2,13 @@
{ config, pkgs, lib, ... }:
{
# Kernel 7.x: the in-tree amdxdna driver on 6.18 is too old for FastFlowLM
# (flm validate: kernel_ok=false, and it loads NPU firmware 1.0.0.63 while
# FLM needs >=1.1.0.0 — the 7.x driver loads npu_7.sbin = 1.1.2.64 instead).
boot.kernelPackages = pkgs.linuxPackages_latest;
# LTS kernel (currently 6.18.x).
# CAVEAT: this breaks FastFlowLM NPU acceleration — the in-tree amdxdna driver
# on 6.18 is too old (flm validate: kernel_ok=false, and it loads NPU firmware
# 1.0.0.63 while FLM needs >=1.1.0.0; the 7.x driver loads npu_7.sbin =
# 1.1.2.64 instead). Switch back to pkgs.linuxPackages_latest if the NPU is
# needed again, until 1.1.x amdxdna lands in an LTS series.
boot.kernelPackages = pkgs.linuxPackages;
# amdgpu GTT (dynamically shared system RAM the iGPU can address) raised to
# 56 GiB. On kernel 6.18 `amdgpu.gttsize` is deprecated; TTM controls it in