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ArmSoM CM1-IO carrier board hardware reference (the baseboard the ArmSoM CM1 / RK3506J module plugs into). Pre-extracted schematic data so you never have to re-parse the ArmSoM CM1-IO PDF: the 40-pin GPIO/FlexBUS header (J4) pinout with Linux gpio numbers and RM_IO indices, the J8001/J8002 core-connector mating map, and every onboard peripheral — dual 10/100 Ethernet (YT8522C PHYs + RJ45), RK730 audio codec + speaker amp + phone jack, USB hub (CH334R) + Type-A ports, WiFi/BT module (BL-M8733BU1), CAN (TCAN1044V) and RS485 (SIT3485E) transceivers, and the 12 V DC-in power tree. Use whenever a task touches the CM1-IO / carrier: header pin assignment, "which gpio is J4 pin N", FlexBUS1 lane breakout, device-tree pinmux, Ethernet/USB/audio/CAN/RS485 wiring, or power. Trigger on "CM1-IO", "carrier", "baseboard", "40-pin header", "J4", "YT8522C", "RK730", "CH334R", "BL-M8733BU1", "FLEXBUS1", or any question answerable from the CM1-IO schematic. The module-side reference is the sibling `armsom:cm1` skill.
How this skill is triggered — by the user, by Claude, or both
Slash command
/armsom:cm1-ioThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
The **CM1-IO** (schematic title "ArmSoM-FORGE1-IO", rev V1.1, 2025-06-10) is the
The CM1-IO (schematic title "ArmSoM-FORGE1-IO", rev V1.1, 2025-06-10) is the
carrier board the CM1 RK3506J module mounts on via the J8001 (40-pin) and
J8002 (44-pin) board-to-board connectors. This skill holds the data extracted
from ArmSoM-CM1-IO-1V1_Sch.pdf (9 sheets) so carrier questions are answered
without re-rendering the PDF. For the module itself (SoC, power tree, core
connector net map) use the sibling armsom:cm1 skill.
Cite the source sheet when you answer (e.g. "CM1-IO sch sheet 8, GPIO-40PIN Header"). If a fact is not here, say so before rendering the PDF.
/-mux label). Actual
behavior depends on the RK3506 device-tree pinmux — the silk/net name is not
proof of how a pin is driven.gpiochipN line = number − bank_base; GPIO0 base 0, GPIO1 base 32,
GPIO4 base 128). It cross-checks against bank math, but confirm against the
RK3506 pinctrl DTSI before committing a pinmux.armsom:cm1 connector tables one-for-one.Same PyMuPDF extractor as the module skill (no poppler):
python3 scripts/extract_schematic.py ArmSoM-CM1-IO-1V1_Sch.pdf --text [PAGE]
python3 scripts/extract_schematic.py ArmSoM-CM1-IO-1V1_Sch.pdf --render PAGE out.png
python3 scripts/extract_schematic.py ArmSoM-CM1-IO-1V1_Sch.pdf --connectors 8 --lx 593 --rx 626 --xband 430 820
| File | What it is | Rev |
|---|---|---|
ArmSoM-CM1-IO-1V1_Sch.pdf | CM1-IO carrier schematic, 9 sheets | V1.1 (2025-06-10) |
Sheet index: 1 Block Diagram · 2 CORE-CONN (J8001/J8002 mating) · 3 Power-DC IN · 4 Ethernet FEPHY RMII0 · 5 Ethernet FEPHY RMII1 · 6 Audio-Codec (RK730 + amp + CAN/RS485 jacks) · 7 USB-HUB / WiFi-BT · 8 GPIO-40PIN Header + CAN0 + RS485 · 9 Revision History.
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