DietPi-SmartPi

DietPi (unofficial) for the YUMi SmartPi One — converts the SmartPi-armbian Debian trixie server image into a DietPi system: minimal footprint, dietpi-software catalog, ramlog, and the full DietPi tooling, on top of the SmartPi One custom stack.

Status: experimental

How it works

1. The GitHub Actions workflow downloads the Yumi-smartpi1-trixie-debian13-server image from the latest SmartPi-armbian release.
2. The image is grown by 2 GB, loop-mounted, and entered with an armhf chroot (qemu-user-static).
3. install.sh runs the official DietPi installer non-interactively with HW_MODEL=25 (Generic Allwinner H3) and DISTRO_TARGET=8 (trixie).
4. The image is shrunk back to its minimal size (+200 MB margin — DietPi re-expands to the full SD card on first boot) and repacked following the OS builder naming convention: Yumi-smartpi1-trixie-debian13-dietpi-{timestamp}.img.xz.

What survives the conversion

HW_MODEL=25 keeps the existing kernel/bootloader stack (the installer only replaces them for explicitly listed boards), and install.sh additionally apt-mark holds every linux-* package:

• U-Boot smartpi1_defconfig (DRAM 576 MHz, ZQ, ODT)
• Kernel 6.18 with the 1368 MHz overclock and sun8i-h3-smartpi-one.dtb
• SmartPad screen auto-detection and 180° rotation (console service)

Usage

Run the Convert to DietPi workflow (Actions tab → Run workflow). Inputs:

Input	Default	Description
release_tag	latest release	SmartPi-armbian release to convert
artifact_filter	smartpi1-trixie-debian13-server	Base image variant
dietpi_owner / dietpi_branch	MichaIng / master	DietPi source
hw_model	25	DietPi hardware model ID
distro_target	8 (trixie)	Debian target: 7 bookworm, 8 trixie, 9 forky/Debian 14 (testing, moving target)

The converted image is published as a workflow artifact and attached to a GitHub release named after the base SmartPi-armbian tag.

First boot

Fully unattended (AUTO_SETUP_AUTOMATED=1): one boot cycle and the system is ready. Network is needed once for dietpi-update to complete the setup.

• Logins: root / yumi and pi / yumi (sudo + hardware groups: gpio, i2c, spi, dialout…).
• Ethernet: DHCP, works out of the box.
• WiFi: enabled by default, the full stack (iw, wpasupplicant, wireless-regdb) ships in the image so a USB dongle works offline. Put your network in dietpi-wifi.txt on the FAT partition (readable from any OS) before first boot, or run dietpi-config later. Set your country in dietpi.txt (AUTO_SETUP_NET_WIFI_COUNTRY_CODE, DietPi upstream default: GB). DietPi's firstboot sets up WiFi first and falls back to Ethernet automatically when no WiFi interface is present — the normal case here, since this board has no onboard WiFi. If a dongle is already plugged in and working at first boot, Ethernet may need enabling by hand afterward (dietpi-config or dietpi-network).
• USB OTG: the port exposes a CDC-NCM network gadget (native on macOS and Windows 11), SSH via 172.22.1.1.