mirror of
https://github.com/openglow-org/forgefirm.git
synced 2026-09-27 16:51:12 -07:00
ScottW514
90384350b3
Replace the repo + default.xml + setup-environment workflow with kas: - add kas/forgefirm-glowforge.yml (Scarthgap layers pinned, meta-openglow as a local sibling) and kas/README.md - remove default.xml, base/conf/forgefirm-bblayers.conf, scripts/setup-environment - .gitignore the kas-managed layers/ and build caches - BUILD.md: kas host setup and build instructions
168 lines
8.6 KiB
Markdown
168 lines
8.6 KiB
Markdown
# Building ForgeFIRM with kas
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The **forgefirm** repo is the base of the project: it controls the build,
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the resulting firmware images land here, and all build/install docs live here.
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It uses [**kas**](https://kas.readthedocs.io/) to manage Yocto layers and drive
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the build, replacing the old Google `repo` + `default.xml` manifest and the
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hand-maintained `base/conf/forgefirm-bblayers.conf`.
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## Baseline
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|---|---|
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| Yocto release | **Scarthgap 5.0 LTS** |
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| Kernel | **linux-fslc 6.12** (mainline LTS, from meta-freescale) |
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| Machine | `glowforge` (i.MX6 Solo SOM — Basic/Plus/Pro) |
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| Distro | `forgefirm` |
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| Image | `forgefirm-image` |
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## Layout
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```
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openglow-forgefirm/
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├── forgefirm/ ← THIS repo, the base
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│ ├── kas/
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│ │ ├── forgefirm-glowforge.yml ← build entry point
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│ │ └── README.md ← this file
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│ ├── meta-forgefirm/ ← the forgefirm layer (this repo)
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│ ├── BUILD.md / INSTALL.md / SERIAL.md
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│ ├── layers/ ← kas-cloned upstreams (gitignored)
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│ ├── build/ ← bitbake output incl. images (gitignored)
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│ ├── downloads/ sstate-cache/ ← caches (gitignored)
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│ └── .gitignore
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├── meta-openglow/ ← Glowforge BSP layers (local sibling, under migration)
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└── kernel-module-glowforge/ ← glowforge.ko sources (pulled by recipe SRC_URI)
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```
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`meta-openglow` is referenced as a **local sibling** (`../meta-openglow`) while
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we migrate it to Scarthgap, so its in-place edits are what gets built. Once that
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migration is committed/pushed, flip it to a kas-cloned + pinned repo (commented
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block in `forgefirm-glowforge.yml`) and the forgefirm repo becomes fully
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self-contained.
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## Prerequisites
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A Linux build host, or **WSL2** on Windows (officially supported by Yocto).
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> **WSL2 note:** keep this whole tree on the WSL2 *native* ext4 filesystem
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> (e.g. `~/dev/openglow-forgefirm`), **not** under `/mnt/c/...`. The Windows
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> mount breaks case-sensitivity/permissions and is very slow for Yocto. Give the
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> WSL2 VM plenty of RAM and disk in `.wslconfig`.
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```bash
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pipx install kas # or: pip install kas
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```
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## Build
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Run from the **forgefirm repo root** so outputs land inside it:
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```bash
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cd forgefirm
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kas build kas/forgefirm-glowforge.yml # fetch layers + full build
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kas shell kas/forgefirm-glowforge.yml # interactive bitbake environment
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kas dump kas/forgefirm-glowforge.yml # print the resolved config
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```
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The bootable image lands in `build/tmp/deploy/images/glowforge/`. Flashing /
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dual-boot install steps are in [`../INSTALL.md`](../INSTALL.md).
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### Container build (optional, reproducible host)
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```bash
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cd forgefirm
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kas-container build kas/forgefirm-glowforge.yml
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```
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## Pinning exact versions (reproducible builds)
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The config tracks the `scarthgap` **branch** of each upstream layer. To lock
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every layer to an exact commit:
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```bash
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kas lock kas/forgefirm-glowforge.yml # writes kas/forgefirm-glowforge.lock.yml
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```
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kas auto-loads the lockfile on subsequent runs. Commit it; refresh deliberately.
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## Scarthgap migration backlog
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The kas scaffold + `LAYERSERIES_COMPAT` bumps let the layers be *selected* under
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Scarthgap, but the legacy (Dunfell/Gatesgarth) layers won't build clean until:
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1. ~~**Override-syntax migration**~~ — **DONE.** All `_append`/`_prepend`/
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`_remove`/`_${PN}` override syntax converted to the colon form across
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`meta-forgefirm`, `meta-openglow-core`, and `meta-glowforge-bsp` (22
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occurrences). Note: `meta-openglow-bsp` (the separate OpenGlow_std board,
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not built here) was intentionally left unconverted.
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2. **Kernel forward-port (4.14 → linux-fslc 6.12.20)** — the factory NXP vendor
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kernel (linux-imx 4.14.98) carried 7 out-of-tree changes; these are re-derived
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against mainline 6.12 in `meta-glowforge-bsp/recipes-kernel/linux/linux-fslc_%.bbappend`
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(the forward-port landing zone), **not** re-applied as the old 4.14 patches.
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- **Foundation — DONE.** `linux-fslc` 6.12.20 builds for `glowforge` with a
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ported device tree (`glowforge.dts` + `openglow_common.dtsi` overlaid into
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`arch/arm/boot/dts/nxp/imx/`, registered via a Makefile patch) and deploys
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`zImage` + `glowforge.dtb`. Boot-core + mainline-bound peripherals only.
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- **Free wins — DONE.** bus-freq disable *dropped* (no mainline busfreq);
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`st,lis2hh12` ×3 + `national,lm75b` + `ti,wl1805` + gpio keys/leds bind to
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mainline drivers; `reg-userspace-consumer` enabled via `glowforge.cfg`.
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(SPI-delay / PWM-prescaler dispositions are under Motion polish below.)
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- **Motion path — DONE (builds clean; runtime needs hardware).** The whole
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chain forward-ports and compiles on 6.12:
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- **EPIT API**: `epit_api.c` in `arch/arm/mach-imx` (`CONFIG_MXC_EPIT_API`),
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in vmlinux, symbols exported; `&epit1/&epit2` in the DT.
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- **SDMA-expose**: re-created `dma-imx-sdma.h` + `0003-imx-sdma-*.patch`
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(un-static survivors, re-added the glowforge helpers, custom int-callback
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hook); expose symbols in `Module.symvers`.
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- **`glowforge.ko`**: ported across many 6.12 API changes
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(`tasklet_hrtimer`→soft hrtimer, `timer_setup`, LED-trigger API,
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`pwm_get`, `spi_delay`/`controller`, `filelock.h`, void `.remove`,
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1-arg i2c probe). Compiles + links, 0 undefined symbols. Built from the
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local sibling via an `externalsrc` bbappend during migration.
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- **DT**: `glowforge,cnc/thermal/pic/head` re-added with `pwms`/`pwm-names`
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phandles; `glowforge.dtb` compiles with all motion nodes.
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Motion polish: PWM prescaler (factory 1001) is **obsolete** — 6.12
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`pwm-imx27` auto-computes the prescaler from the requested period. The PIC
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inter-word SPI delay (factory 1005) is a **hardware-bring-up TODO**: 6.12
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`spi-imx.c` has no `PERIODREG`/`word_delay` programming, so re-derive it in
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`spi_imx_setupxfer` (write `MX51_ECSPI_PERIODREG` from `t->word_delay`,
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guarded to ECSPI) and verify the wait-states on a scope. pic.c keeps the
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inter-transfer delay meanwhile. `glowforge,imx-pwm-audio` (buzzer) deferred.
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- **Camera — DONE (builds clean; runtime needs hardware).** The factory
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`ov5648_mipi.c` (NXP's removed `v4l2_int_device`/`mxc_v4l2_capture`) is
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replaced by the mainline `ovti,ov5648` subdev + imx6 `imx-media` (IPU CSI)
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+ `imx6-mipi-csi2` receiver. The factory CAM_SEL MIPI switch is modelled
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with the mainline `video-mux` (gpio-mux on `gpio7 10`): both `ov5648`s →
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video-mux → `mipi_csi` → IPU CSI. Sensor `xvclk` (25 MHz fixed-clock) +
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avdd/dovdd/dvdd rails in the DT. All drivers build as modules and
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`glowforge.dtb` compiles with the full pipeline. **HW bring-up:** confirm
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the real supply rails, CSI-2 lane count/order and CAM_SEL polarity, then
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validate with `media-ctl` + a v4l2 capture.
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3. **u-boot** — ~~rebuild for Scarthgap~~ **DONE.** The `glowforge` u-boot is now
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a standalone `u-boot_2020.01.bb` (Scarthgap dropped the Dunfell-era poky base
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recipe the old `.bbappend` extended). It reuses poky's
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`u-boot-common.inc`/`u-boot.inc`, pins `SRCREV` to the upstream **v2020.01**
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tag with the matching `Licenses/README` md5, and overlays the glowforge board
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support + arch-Kconfig patch. **Builds clean under Scarthgap (GCC 13, no
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source fixes) and deploys `u-boot-glowforge.imx`.** Remaining: move
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`fw_printenv`/`fw_setenv` from `u-boot-fw-utils` to `libubootenv`
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(`PREFERRED_PROVIDER_u-boot-fw-utils` in `glowforge.inc`) when the rootfs needs
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them.
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4. **Device tree** — revalidate the `glowforge` `.dts` against the linux-fslc
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6.12 DT bindings (paired with the kernel forward-port in #2).
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5. **gfui-client → forgectrl** — the Glowforge **cloud client is now removed**
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from `forgefirm-image` (`IMAGE_INSTALL:remove = "gfui-client"` in
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`meta-forgefirm/recipes-forgefirm/images/forgefirm-image.bb`) — it connected to
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Glowforge's servers, the dependency ForgeFIRM exists to cut. The grblHAL
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controller + web UI (`forgectrl`, currently a placeholder) will fill its place.
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---
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**Image status:** `forgefirm-image` **builds end-to-end** on the forward-ported
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stack and deploys `forgefirm-image-glowforge.rootfs.wic.gz` (+ `zImage`,
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`glowforge.dtb`, `u-boot-glowforge.imx`) under `build/tmp/deploy/images/glowforge/`.
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Build-time prerequisites baked into the config: `ACCEPT_FSL_EULA = "1"` (NXP
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firmware-imx) and the kernel default in `glowforge.conf`. Everything compiles;
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on-hardware bring-up (motion timing, laser/safety chain, camera pipeline) is the
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remaining validation and needs a real board.
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