rob thijssen
0a82d2c2d7
The WCN3990 has no burned-in Bluetooth address, so the kernel registers the controller unconfigured and bluetoothd never sees it. The factory address is on the machine all along: QCOM/BT.PROVISION on the DPP partition, a three-byte header followed by the six-byte address. c630-bt-addr reads it and hands it to btmgmt before bluetooth.service starts. Verified on hardware: controller configures, powers, scans, and streams A2DP. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011XgGF5wfxLDAybVnNz6eNQ
54 lines
1.8 KiB
Bash
Executable File
54 lines
1.8 KiB
Bash
Executable File
#!/usr/bin/bash
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#
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# Give the Bluetooth controller its factory address.
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#
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# The WCN3990 has no burned-in Bluetooth address. The kernel brings the
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# controller up, downloads its firmware, and then registers it *unconfigured* —
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# it answers on /sys/class/bluetooth but does not appear in the management
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# interface, so bluetoothctl reports "No default controller available" and
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# nothing works until userspace supplies an address.
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#
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# The factory address is on the machine, in the Windows provisioning partition
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# (GPT label DPP, FAT): QCOM/BT.PROVISION is nine bytes — a three-byte header
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# followed by the six-byte address in display order. QCOM/WLAN.PROVISION holds
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# the WiFi MAC in the same layout, sharing the same OUI block, which is how the
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# layout was recognised.
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#
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# Setting it flips the controller from unconfigured to configured and powered.
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set -euo pipefail
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for _ in $(seq 30); do
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[ -d /sys/class/bluetooth/hci0 ] && break
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sleep 1
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done
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if [ ! -d /sys/class/bluetooth/hci0 ]; then
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echo "c630-bt-addr: no Bluetooth controller appeared; nothing to do"
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exit 0
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fi
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if ! btmgmt info | grep -q "Index list with 0 items"; then
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echo "c630-bt-addr: controller already configured; nothing to do"
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exit 0
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fi
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dpp=/dev/disk/by-partlabel/DPP
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if [ ! -b "$dpp" ]; then
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echo "c630-bt-addr: no DPP partition; cannot recover the factory address" >&2
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exit 0
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fi
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mnt=$(mktemp -d)
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trap 'umount "$mnt" 2>/dev/null || true; rmdir "$mnt"' EXIT
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mount -o ro "$dpp" "$mnt"
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prov="$mnt/QCOM/BT.PROVISION"
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if [ ! -f "$prov" ] || [ "$(stat -c %s "$prov")" -lt 9 ]; then
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echo "c630-bt-addr: $prov missing or too short" >&2
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exit 0
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fi
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addr=$(od -An -tx1 -j3 -N6 "$prov" | tr -s ' ' '\n' | grep . | paste -sd:)
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btmgmt --index 0 public-addr "$addr"
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echo "c630-bt-addr: set hci0 public address to $addr"
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