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reterminal-dm4/chromium-setup/emmc-provisioning/90-cm4-boot-mode.rules

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# When reTerminal (CM4) is connected in USB boot mode (eMMC disable jumper),
# Raspberry Pi Foundation USB device appears (vendor 2b8e). Trigger auto-flash.
# Install: sudo cp 90-cm4-boot-mode.rules /etc/udev/rules.d/
# sudo udevadm control --reload-rules
# The trigger script starts the actual flash via systemd so udev does not block.
SUBSYSTEM=="usb", ATTR{idVendor}=="2b8e", ACTION=="add", \
RUN+="/usr/local/bin/cm4-flash-trigger.sh"