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Derive PB2 USB gadget MACs from identity

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This commit is contained in:
Andrei Aldea
2026-06-21 14:19:43 +02:00
committed by Igor
parent 7e142f77b8
commit fc3ccd2b4a
2 changed files with 59 additions and 7 deletions
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.gitattributes
+3
View File
@@ -0,0 +1,3 @@
.gitattributes text eol=lf
config/boards/pocketbeagle2.conf text eol=lf
packages/bsp/pocketbeagle2-usb-gadget/* text eol=lf
packages/bsp/pocketbeagle2-usb-gadget/pb2-usb-gadget-ncm-acm
+56 -7
View File
@@ -3,10 +3,60 @@ set -eu
G=/sys/kernel/config/usb_gadget/pb2
CONFIG=c.1
DEV_MAC=7e:d3:6e:6d:ad:50
HOST_MAC=3e:4e:a9:17:31:0e
IDENTITY_DIR=/var/lib/pb2-usb-gadget
IDENTITY_FILE=$IDENTITY_DIR/identity
FALLBACK_SERIAL=PB2NCMACM0001
read_dt_serial() {
if [ -r /proc/device-tree/serial-number ]; then
serial=$(tr -d '\000' < /proc/device-tree/serial-number)
if [ -n "$serial" ]; then
printf '%s\n' "$serial"
return 0
fi
fi
return 1
}
persistent_identity() {
if [ -s "$IDENTITY_FILE" ]; then
cat "$IDENTITY_FILE"
return 0
fi
mkdir -p "$IDENTITY_DIR"
identity=$(od -An -N16 -tx1 /dev/urandom | tr -d ' \n')
if [ -z "$identity" ]; then
identity=$FALLBACK_SERIAL
fi
printf '%s\n' "$identity" > "$IDENTITY_FILE"
chmod 600 "$IDENTITY_FILE"
printf '%s\n' "$identity"
}
usb_serial() {
if serial=$(read_dt_serial); then
printf '%s\n' "$serial"
return 0
fi
printf 'PB2NCMACM-%s\n' "$(persistent_identity)"
}
derive_mac() {
prefix=$1
label=$2
hash=$(printf '%s:%s\n' "$label" "$USB_SERIAL" | sha256sum | cut -d' ' -f1)
printf '%s:%s:%s:%s:%s:%s\n' \
"$prefix" \
"$(printf '%s' "$hash" | cut -c1-2)" \
"$(printf '%s' "$hash" | cut -c3-4)" \
"$(printf '%s' "$hash" | cut -c5-6)" \
"$(printf '%s' "$hash" | cut -c7-8)" \
"$(printf '%s' "$hash" | cut -c9-10)"
}
first_udc() {
for u in /sys/class/udc/*; do
[ -e "$u" ] || continue
@@ -54,6 +104,9 @@ fi
cleanup_configfs
UDC=$(first_udc)
USB_SERIAL=$(usb_serial)
DEV_MAC=$(derive_mac 02 pb2-dev)
HOST_MAC=$(derive_mac 06 pb2-host)
mkdir -p "$G"
cd "$G"
@@ -67,11 +120,7 @@ printf '0x02\n' > bDeviceSubClass
printf '0x01\n' > bDeviceProtocol
mkdir -p strings/0x409
if [ -r /proc/device-tree/serial-number ]; then
tr -d '\000' < /proc/device-tree/serial-number > strings/0x409/serialnumber || printf '%s\n' "$FALLBACK_SERIAL" > strings/0x409/serialnumber
else
printf '%s\n' "$FALLBACK_SERIAL" > strings/0x409/serialnumber
fi
printf '%s\n' "$USB_SERIAL" > strings/0x409/serialnumber
printf 'BeagleBoard.org\n' > strings/0x409/manufacturer
printf 'PocketBeagle 2 NCM+ACM\n' > strings/0x409/product