b0hemia
e0bc4785e9
Flashes the diskOS custom UI onto the FiiO Snowsky Disc over Ingenic mask-ROM USB, building the image from your own stock firmware. Runs from source via install.sh.
89 lines
3.0 KiB
Bash
Executable File
89 lines
3.0 KiB
Bash
Executable File
#!/bin/sh
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# diskOS dev/recovery: USB CDC-ACM serial console on the device USB-C port.
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# Host enumerates 0525:a4a7 -> /dev/ttyACM0 -> root shell (raw, no login).
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#
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# Robust against the failure that killed the previous attempt: the stock
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# serial_config.sh binds the UDC exactly once and never retries, so a UDC that
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# registers (or a host that plugs in) a moment later was missed. This runs a
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# persistent supervisor: (re)bind whenever a UDC is present, keep a shell alive
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# on ttyGS0. All steps best-effort + logged to a persistent (rw) partition.
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LOG=/usr/data/fiio/usbserial.log
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G=/sys/kernel/config/usb_gadget/serial_demo
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log() { echo "$(date 2>/dev/null) $*" >> "$LOG" 2>/dev/null; }
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build_gadget() {
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[ -d /sys/kernel/config/usb_gadget ] || mount -t configfs none /sys/kernel/config 2>/dev/null
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[ -d "$G" ] && return 0
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mkdir -p "$G" || return 1
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echo 0x0525 > "$G/idVendor"
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echo 0xa4a7 > "$G/idProduct"
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echo 0x0200 > "$G/bcdUSB"
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echo 0x2400 > "$G/bcdDevice"
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echo 0x02 > "$G/bDeviceClass"
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echo 0x00 > "$G/bDeviceSubClass"
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echo 0x00 > "$G/bDeviceProtocol"
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mkdir -p "$G/strings/0x409"
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echo "INGENIC" > "$G/strings/0x409/manufacturer"
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echo "diskOS Serial" > "$G/strings/0x409/product"
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echo "diskos-serial" > "$G/strings/0x409/serialnumber"
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mkdir -p "$G/configs/c.1/strings/0x409"
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echo 120 > "$G/configs/c.1/MaxPower"
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echo 0x80 > "$G/configs/c.1/bmAttributes"
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echo "serial" > "$G/configs/c.1/strings/0x409/configuration"
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mkdir -p "$G/functions/acm.0"
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ln -sf "$G/functions/acm.0" "$G/configs/c.1/" 2>/dev/null
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log "gadget built"
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}
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# Best-effort nudge into peripheral mode. dr_mode=otg already auto-switches to
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# device when plugged into a host (CC/pin), so this is only a safety net. Only
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# the unambiguous "device" token is written -- never anything that could select
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# host mode and break enumeration.
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force_device_mode() {
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for f in /sys/devices/platform/*otg*/dwc2_mode \
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/sys/devices/platform/*otg*/dwc2_force_dr_mode \
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/sys/devices/platform/*/13500000.otg/dwc2_mode; do
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[ -e "$f" ] || continue
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echo device > "$f" 2>/dev/null && log "wrote device-mode to $f"
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done
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}
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bound() { [ -n "$(cat "$G/UDC" 2>/dev/null)" ]; }
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bind_when_ready() {
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udc=$(ls /sys/class/udc/ 2>/dev/null | head -n1)
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[ -n "$udc" ] || return 1
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echo "$udc" > "$G/UDC" 2>/dev/null && { log "bound UDC=$udc"; return 0; }
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return 1
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}
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# Delegate the ttyGS0 shell to diskos-debug (the SINGLE owner - fuser-guarded + self-respawning).
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# Two independent shell respawners on one tty is the classic "answers once then goes silent" wedge,
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# so this script no longer binds its own shell; it only builds the gadget and asks diskos-debug to
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# attach the one shell. Idempotent: serial-on is a no-op if a shell already owns ttyGS0.
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DEBUG=/usr/project/diskos-debug.sh
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ensure_shell() {
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[ -c /dev/ttyGS0 ] || return 0
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[ -x "$DEBUG" ] && "$DEBUG" serial-on >/dev/null 2>&1
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}
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main() {
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: > "$LOG" 2>/dev/null
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log "S99usbserial start"
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build_gadget
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force_device_mode
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while true; do
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bound || bind_when_ready
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ensure_shell
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sleep 2
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done
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}
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case "$1" in
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start) main & ;;
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*) exit 1 ;;
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esac
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exit 0
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