Board passport

Confirmed hardware

The target contains an ESP32-C6FH4 (chip revision 0.2) with 4 MB of embedded Flash and a 40 MHz crystal. It was identified electronically on 2026-08-27 with esptool.py 4.11.0 through the native Espressif USB Serial/JTAG interface at /dev/ttyACM0 (USB VID:PID 303a:1001). No PSRAM was reported or is required.

These observations establish chip-level facts only. The carrier PCB maker, commercial model, revision, GPIO routing, and any built-in LED remain unknown. Firmware must not depend on those unverified details.

Locked project baseline

The canonical build uses:

PlatformIO with platformio/espressif32@7.0.1;
ESP-IDF;
the compatible esp32-c6-devkitm-1 build profile;
explicit 4 MB build and upload Flash sizes;
sdkconfig.defaults with 4 MB Flash and 16 LwIP sockets;
the root partitions.csv layout;
LittleFS for browser assets;
no OTA partition and no PSRAM requirement.

The PlatformIO board profile is a compatible compilation target. It is not evidence that the physical carrier is an Espressif ESP32-C6-DevKitM-1.

Canonical Flash layout

Name	Type	Subtype	Offset	Size	End
`nvs`	data	nvs	`0x9000`	`0x6000`	`0xF000`
`phy_init`	data	phy	`0xF000`	`0x1000`	`0x10000`
`factory`	app	factory	`0x10000`	`0x200000`	`0x210000`
`littlefs`	data	littlefs	`0x210000`	`0x1F0000`	`0x400000`

The partitions are contiguous from NVS through the end of Flash. The factory application partition is 2 MiB, the LittleFS partition is 1,984 KiB, and the layout ends exactly at the confirmed 4 MB boundary. The area below 0x9000 is reserved for the bootloader and partition table by the ESP-IDF layout.

Explicit unknowns

The following facts have not been verified and must not be assumed:

carrier PCB manufacturer, model, or revision;
header and peripheral GPIO mapping;
presence, GPIO, polarity, or type of a built-in LED;
whether the carrier uses native USB only or includes another USB bridge;
availability of optional external RAM or peripherals.

Clear photographs of both sides of the board and matching manufacturer documentation are required before adopting any carrier-specific pin mapping.

Candidate documentation

The esp32-c6-devkitm-1 PlatformIO profile is used for compatibility only. Espressif's DevKitM-1 documentation may be consulted as a candidate reference, but its PCB-specific details remain noncanonical until physical markings prove that the target is that model:

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