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BRINGUP: correct the hot-swap note - kernel overlay edits require an image flash

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ScottW514
2026-08-03 16:15:12 -04:00
parent 32cc3ecdee
commit 1a723fa303
1 changed files with 6 additions and 7 deletions
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docs/BRINGUP.md
+6 -7
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@@ -74,14 +74,13 @@ motion constants were extracted from the `_RESOURCES` pulse files
glowforge`. NOTE: a module reload turns off the lid LED (relight via
`/sys/class/leds/lid_led*/target`) and resets analog config (below).
- **Module hot-swap vs kernel re-stamps**: the hot-swap only loads if
the module was built against the FLASHED kernel's patch state — any
the module was built against the FLASHED kernel's patch state. Any
edit under the kernel recipe's overlay (e.g. glowforge.dts)
re-stamps CONFIG_LOCALVERSION_AUTO and the module's vermagic stops
matching. To build a hot-swappable module after such an edit:
`git checkout HEAD~1 -- <the edited file>` in the WSL meta-openglow
copy, `bitbake kernel-module-glowforge` (sstate restores the flashed
kernel's tree bit-for-bit), restore the file. The DT change itself
waits for the next image flash.
re-stamps CONFIG_LOCALVERSION_AUTO — and the stamp does NOT
reproduce by reverting the edit (the kernel patch tree is a fresh
git commit each do_patch, not sstate-restored), so after any
overlay edit the module can only ship with a full image flash.
Batch kernel-overlay edits accordingly.
- **Build host**: WSL2 distro `forge-yocto`, tree at
`~/dev/openglow-forgefirm`. `~/src-sync.sh` rsyncs the Windows repos in
(includes `python3-gfhardware` and `grblHAL-glowforge`). Build: