Direct PWMSAR duty steps with the machine in the locked state
(controller stopped, cnc disabled so steppers are unpowered, laser
latch locked, lid closed; laser_on_sampled stayed 0 throughout).
Measured on the pin: 25.0 us period / 40 kHz stable across the full
duty range; 50/25/75 percent confirmed visually; low end
cursor-measured 6.4 vs 6.3 percent commanded (PWMSAR=8), clean pulse.
Matches the register-level audit numbers (divider 13 x 127 counts).
Adds pwm_sweep.py / pwm_hold.py to the bench kit and records the two
remaining pre-live-fire gates (1-tick laser drop at underrun via the
stream path with FIRE observable under a locked latch; interlock
readback semantics) in BRINGUP.
Full design job (rapid / M4 cut trace / return rapid) ran smoothly end
to end on grblHAL-glowforge over TCP:23, laser locked. Records the two
driver fixes the first attempts surfaced: locked laser spindle and
continuation-wakeup cursor alignment.
Operator confirmed smooth, near-silent motion on a full observation run
(slow/fast/diagonal/zigzag jogs to 200 mm/s) under grblHAL-glowforge
with the factory-true analog config. Milestone 2 closed.
The step backend now lives in github.com/ScottW514/grblHAL-glowforge
(grblHAL driver convention: core submodule, driver.c HAL, board header).
Add build-glowforge.sh, update the BRINGUP runbook (no -t throttle,
EEPROM path, kill-before-scp, producer stats line, reset/disconnect
semantics), and teach bench_m2.py to parse the F: status field (no
spindle registered = no FS: field). Settings-write crash fix is
upstream as grblHAL/core PR 999.
Extract the factory motion profile from the _RESOURCES pulse streams
(new puls_profile.py): 700/590 mm/s2 X/Y accel on v2.6.0 firmware,
202 mm/s travel peak at the 28160 Hz travel tick, PIC currents X 135/33
and Y 22/5 run/hold, decay mode 1. Add the bench_m2.py round-trip jog +
feed-hold suite (all green 2026-08-02: sustained 200 mm/s, exact
returns, clean hold/resume, zero underruns) and update BRINGUP.md:
board moved to a fixed lease at 172.16.1.97, analog config now applied
by the sink itself, $RST=$ note for stale stored settings.
BRINGUP.md is the cold-start reference: project status (audit phases
0-5 complete, Phase 6 spike achieved - first grblHAL-commanded motion
2026-07-26), bench/board access, build+deploy procedures, the step
backend runbook incl. the required analog machine config, the measured
hardware facts bank, and the ordered next-work list. scripts/bench/
preserves the hardware-verification tools (underrun feeder, end-of-
data protocol bench, PWM register check, cross-build scripts).
ulfius builds itself with -Werror -Wconversion; Yocto Scarthgap sets
-D_TIME_BITS=64 on arm32, making a long-long-to-long time conversion
in u_websocket.c fatal. Exclude conversion warnings from -Werror.
install-forgefirm.sh completed silently broken when the download, flash
write, mount or uEnv rewrite failed - add die() checks around every
critical step (audit N13/M12) and download the release asset under the
exact Scarthgap artifact name (forgefirm-image-glowforge.rootfs.wic.gz)
so uploads need no renaming. ffboot no longer depends on the never-
provisioned /etc/fw_env_mmcblk2.config: it falls back to
/etc/fw_env.config (which both the factory and ForgeFIRM images ship,
pointing at the eMMC env) and checks fw_setenv results (audit N16).
BUILD.md gets the real artifact name and marks the built u-boot
reference-only; INSTALL.md drops the stale script/ogboot names and the
cloud-connect promise, stating the image is bring-up-only (audit N11).
The dev image required the shared glowforge-image base directly, so it
was not a superset of forgefirm-image (it lacked v4l-utils, audit N12).
Require forgefirm-image and add forgectrl + debug tooling on top.
The ulfius recipe tracked AUTOREV master and could never build: master
requires orcania/yder versions that have no release tags, no recipe for
either existed in any layer, and curl (default-ON WITH_CURL) was
missing from DEPENDS (audit M10). Pin the coherent release set - ulfius
v2.7.15 + orcania v2.3.3 + yder v1.4.20 - add the two new recipes,
add curl, convert to SPDX LGPL-2.1-or-later, and rename the misspelled
recipes-extended/uflius directory.
CONFIG_PREEMPT=y (factory behavior); PREEMPT_RT unavailable on arm32
6.12 and unnecessary for the pulse feeder - the 128 MiB SDMA ring at
1 byte per EPIT tick holds minutes of stream, so deep buffering plus
SCHED_FIFO rides out any PREEMPT-scale scheduling latency. Documents
the audit M9/N15 arithmetic next to the migration backlog.
kernel-module-glowforge and python3-gfhardware are now pushed and pinned by
SRCREV in meta-openglow (no AUTOREV anywhere), and the meta-openglow
Scarthgap port is published on its scarthgap branch. Record the full
push/release sequencing in kas/README.md (incl. the release-time flip to the
pinned-remote meta-openglow block and the release-asset naming rule), and
commit the kas lockfile pinning poky/meta-openembedded/meta-freescale(-distro)
at the revisions the working build used.
The untracked kas/externalsrc-dev.yml overlay (local python3-gfhardware via
/mnt/c) is removed: the pinned SRCREV replaces it.
v4l2-ctl (alongside the already-present media-ctl) configures the
imx-media pipeline and grabs raw frames from /dev/video4 while the
gfhardware capture path is ported off the factory NXP V4L2 model.
gfui-client connects to Glowforge's servers; ForgeFIRM replaces it with a
local grblHAL controller (forgectrl). Remove it from the image via an
override, leaving the shared glowforge-image base untouched.
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
ScottW514