Some R36S boards have SARADC ADC values in the R33S range (140-190),
causing a_boot.ini to load the R33S DTB — which has no analog sticks,
no THUMBL/THUMBR buttons, and no FN (BTN_MODE).
Fix: add GPIO2_PA2 (THUMBL) check in a_boot.ini when hwrev=r33s.
R36S has a pull-up on this pin (L3 button), R33S does not.
Audio: R36S original has an external speaker amplifier on GPIO3_PC4.
The mainline rk817_codec.c does not support the BSP-only spk-ctl-gpios
property. Fix: add simple-audio-amplifier node to the R36S DTS with
aux-devs routing through the sound card.
Also set CONFIG_SND_SOC_SIMPLE_AMPLIFIER=y (was =m).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Interactive tool scripts for EmulationStation's OPTIONS menu at /opt/system/:
system-info, wifi-setup, bluetooth-setup, performance-mode, suspend-mode,
usb-mode, factory-reset. Uses shared menu-lib.sh with fbcon rendering.
Gamepad configs: default.gptk (RetroArch), tools.gptk (menu navigation
with D-pad arrows, A=enter, B=escape).
Note: scripts need further testing on hardware — left disabled for now.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Major architecture change: move from BSP kernel 6.6 with pre-merged panel
DTBs to mainline kernel 6.12.61 LTS with separated board DTBs + panel
overlays.
- Board DTB = hardware profile (GPIOs, PMIC, joypad, audio). 16 boards.
Auto-selected by U-Boot via SARADC ADC reading (hwrev).
- Panel overlay = display init sequence. 20 panels. Applied at boot time
via boot.ini fdt apply.
- Two image variants: original (a_boot.ini) and clone (b_boot.ini)
- Kernel cross-compiles from x86 host (no ARM chroot needed)
- Initramfs boot splash with SVG rendering at 0.7s
- Out-of-tree joypad driver (singleadc-joypad) for clone boards
- Panel generic-dsi driver with archr,generic-dsi compatible
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Third build variant (--variant no-panel) that includes all 18 panel
DTBs for both original and clone hardware. Designed for the future
Arch R Flasher app to inject the correct kernel.dtb at flash time.
- boot.ini: auto-detect root device from mmcdev (no more __ROOTDEV__)
- build-image.sh: no-panel uses mainline U-Boot, copies all DTBs
- panel-detect.py: wizard disabled for no-panel variant
- build-all.sh: generates third image (ArchR-R36S-no-panel)
- input-merge daemon: combines gpio-keys + adc-joystick into single
virtual "Arch R Gamepad" via uinput so RetroArch sees one device
(fixes analog sticks ignored due to max_users=1)
- retroarch-launch.sh: start/stop input-merge, VT blank on launch
- retroarch.cfg: ROCKNIX-based tuning (48kHz audio, triple buffer,
late input polling, autosave, core options path)
- retroarch-core-options.cfg: per-core tuning from ROCKNIX RK3326
(mupen64plus, pcsx_rearmed, flycast, mame2003-plus, melonds, etc.)
- archr-gamepad.cfg: autoconfig for merged virtual device
- panel-detect.py: panels in numerical order (beep count = position),
default_panel searches by empty dtb_name instead of panels[0]
- build-rootfs.sh: compile input-merge, install core options and
autoconfig, add input-merge and kill to sudoers
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Users reported that non-default panel overlays caused broken display,
audio, and controls. Root cause: BSP U-Boot's fdt apply has bugs with
property replacement of different-sized data, corrupting the DTB.
Fix: apply overlays at build-time using fdtoverlay (verified working)
instead of at boot-time. Each panel now gets a pre-merged kernel-*.dtb.
U-Boot simply loads the right DTB by name — no fdt apply needed.
- generate-panel-dtbos.sh: add fdtoverlay pre-merge step
- build-image.sh: copy pre-merged DTBs instead of ScreenFiles
- boot.ini: load PanelDTB by name, remove fdt addr/resize/apply
- panel-detect.py: write DTB filename instead of DTBO overlay path
