Add board pages for 3 missing boards from 10.2.1 and 10.3.0-alpha.2

_board/adafruit_p4gpio.md

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+---
+layout: download
+board_id: "adafruit_p4gpio"
+title: "Adafruit P4 GPIO Download"
+name: "Adafruit P4 GPIO"
+manufacturer: "Adafruit"
+board_url:
+ - "https://github.com/adafruit/circuitpython/tree/main/ports/espressif/boards/adafruit_p4gpio"
+board_image: "adafruit_p4gpio.jpg"
+date_added: 2026-05-19
+family: esp32p4
+features:
+  - USB-C
+---
+
+The Adafruit P4 GPIO is a development board based on the Espressif ESP32-P4 (rev 3+) dual-core RISC-V SoC running at up to 400 MHz, paired with 16 MB of QSPI flash and 32 MB of HPI PSRAM. The board breaks out the ESP32-P4 GPIO pins across four 8-pin headers (B1–B4), with a status NeoPixel on GPIO52 and a boot button on GPIO35. Two USB ports are provided: a high-speed USB device on the J1 connector and a full-speed USB on J2.
+
+This board is not yet available for purchase. Board definition by Scott Shawcroft ([@tannewt](https://github.com/tannewt)).
+
+## Learn More
+
+* [CircuitPython board definition](https://github.com/adafruit/circuitpython/tree/main/ports/espressif/boards/adafruit_p4gpio)
+* [KiCad design files (tannewt/p4gpio)](https://github.com/tannewt/p4gpio)
+* [Deep Dive w/Scott: Finishing P4HIL](https://www.youtube.com/live/mMIY6kds0XM) (board hardware shown)
+* [Deep Dive w/Scott: ESP32-P4 Logic Analyzer](https://www.youtube.com/watch?v=9de1m5kM4es) (KiCad walkthrough)

_board/espressif_esp32p4x_function_ev.md

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+---
+layout: download
+board_id: "espressif_esp32p4x_function_ev"
+title: "ESP32-P4X-Function-EV Download"
+name: "ESP32-P4X-Function-EV"
+manufacturer: "Espressif"
+board_url:
+ - "https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32p4/esp32-p4-function-ev-board/user_guide.html"
+board_image: "espressif_esp32p4_function_ev.jpg"
+date_added: 2026-05-19
+family: esp32p4
+features:
+  - Wi-Fi
+  - Bluetooth/BTLE
+  - USB-C
+  - External Display
+---
+
+The ESP32-P4X-Function-EV is the rev 3 variant of Espressif's ESP32-P4-Function-EV multimedia development board. ESP32-P4 features a dual-core 400 MHz RISC-V processor and supports up to 32 MB PSRAM. In addition, ESP32-P4 supports USB 2.0 specification, MIPI-CSI/DSI, an H.264 encoder, and various other peripherals. With all of its outstanding features, the board is an ideal choice for developing low-cost, high-performance, low-power network-connected audio and video products.
+
+The 2.4 GHz Wi-Fi 6 & Bluetooth 5 (LE) module ESP32-C6-MINI-1 serves as the Wi-Fi and Bluetooth module of the board. The board also includes a 7-inch capacitive touch screen with a resolution of 1024 x 600 and a 2 MP camera with MIPI CSI, enriching the user interaction experience. The development board is suitable for prototyping a wide range of products, including visual doorbells, network cameras, smart home central control screens, LCD electronic price tags, two-wheel vehicle dashboards, etc.
+
+Most of the I/O pins are broken out to the pin headers for easy interfacing. Developers can connect peripherals with jumper wires.
+
+[Hardware User Guide is available here](https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32p4/esp32-p4-function-ev-board/user_guide.html)
+
+## Purchase
+
+* [AliExpress](https://www.aliexpress.us/item/3256807624599045.html)

_board/nhbsystems_jl401_4mbflash_2mbpsram.md

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+---
+layout: download
+board_id: "nhbsystems_jl401_4mbflash_2mbpsram"
+title: "NHB Systems JL401-S3 4MB Flash 2MB PSRAM Download"
+name: "NHB Systems JL401-S3 4MB Flash 2MB PSRAM"
+manufacturer: "NHB Systems"
+board_url:
+ - "https://www.tindie.com/stores/nhbsystems/"
+ - "https://github.com/NHBSystems"
+board_image: "unknown.jpg"
+date_added: 2026-05-19
+family: esp32s3
+downloads_display: false
+features:
+  - USB-C
+  - STEMMA QT/QWIIC
+---
+
+The NHB Systems JL401-S3 is a datalogger board built around the ESP32-S3-MINI-1 module with 4 MB of flash and 2 MB of PSRAM and a native USB-C interface. The board integrates a rich set of on-board peripherals aimed at field data acquisition:
+
+* Analog Devices AD7124-4 24-bit ADC
+* PCA9546A I²C multiplexer
+* MCP7940N real-time clock
+* ST LSM6DSO 6-axis IMU
+* microSD card slot
+* Status NeoPixel with switchable power
+* Switchable I²C and microSD power rails
+
+This board is not yet released for sale. Board definition by Jaimy Juliano ([@jjuliano77](https://github.com/jjuliano77)) of NHB Systems.
+
+## Learn More
+
+* [NHB Systems on Tindie](https://www.tindie.com/stores/nhbsystems/) (manufacturer's storefront; JL401-S3 not yet listed)
+* [NHB Systems on GitHub](https://github.com/NHBSystems)
+* [NHB_CircuitPython_AD7124](https://github.com/NHBSystems/NHB_CircuitPython_AD7124) — CircuitPython driver for the on-board 24-bit ADC