_posts: add post notifying about linux-firmware compression change

Author: classabbyamp

_posts/2026-03-10-firmware-compression.md

@@ -0,0 +1,25 @@
+---
+title: "Changes to linux-firmware may require manual intervention"
+layout: post
+---
+
+To reduce installation size, firmware provided by `linux-firmware` is now
+compressed with zstd. Ensure you are running a supported kernel when updating to
+`linux-firmware-20260309_1` or later:
+
+- `linux5.10>=5.10.251_1`
+- `linux5.15>=5.15.201_1`
+- `linux6.1>=6.1.127_1`
+- `linux6.6>=6.6.68_1`
+- `linux6.12>=6.12.7_1`
+- `linux6.18`, `linux6.19`, or any later version
+- `rpi-kernel>=6.12.67_1`
+- `pinephone-kernel>=6.1.7_2`
+
+If you cannot run one of these kernels, you can hold the `linux-firmware` packages
+at their currently-installed version:
+
+```
+# xbps-pkgdb -m hold linux-firmware linux-firmware-amd linux-firmware-broadcom \
+    linux-firmware-intel linux-firmware-network linux-firmware-nvidia linux-firmware-qualcomm
+```