alarm/firmware-brcm43xx: Generate semi-random MAC address and make service conf optional

Prevents MAC conflicts when settings up multiple systems at the same time.

alarm/firmware-brcm43xx/PKGBUILD

@@ -19,17 +19,15 @@ source=('https://raw.githubusercontent.com/OpenBricks/openbricks/master/packages
         'https://github.com/OpenBricks/openbricks/raw/master/packages/brcm-patchram-plus/sources/bcm4330.hcd'
         'https://raw.githubusercontent.com/OpenBricks/openbricks/master/packages/brcm-patchram-plus/sources/brcm_patchram_plus.c'
         'start-brcm-patchram-plus'
-        'brcm43xx.service'
-        'bcm43xx')
+        'brcm43xx.service')
 md5sums=('bf01292eec17815baa68a83d3d7722ad'
          '31a9a011ce24707ed3c1024616c9005e'
          '31a9a011ce24707ed3c1024616c9005e'
          'ff27325602dc223203adfdd23a89844b'
          '8e32f9168aaa540467589c153129c57a'
          '627e9612337e5ef6027a87a79c491446'
-         'c2d65a43d3c1c5eb7e2d168440867db4'
-         '7e4dcf16c3def9b5a159627b25b21e1e'
-         '587fa5f25768380605287057924238e6')
+         '33ec0f0cfbbdd42b933d0a2ad93f7181'
+         'f2eefa2042130e559b2d664a3fcc7b50')
 
 build() {
   cd "${srcdir}/"

alarm/firmware-brcm43xx/bcm43xx

@@ -1 +0,0 @@
-MAC_ADDR=43:29:B1:55:01:01

alarm/firmware-brcm43xx/brcm43xx.service

@@ -3,7 +3,7 @@ Description=Load Broadcom bluetooth firmware
 Before=bluetooth.service
 
 [Service]
-EnvironmentFile=/etc/conf.d/bcm43xx
+EnvironmentFile=-/etc/conf.d/bcm43xx
 Type=oneshot
 ExecStart=/usr/lib/systemd/scripts/start-brcm-patchram-plus
 RemainAfterExit=yes

alarm/firmware-brcm43xx/start-brcm-patchram-plus

@@ -1,12 +1,17 @@
 #!/bin/sh
 
+CACHE=/var/cache/brcm43xx-mac
 MAC_OPTIONS=""
 if [ -z "$MAC_ADDR" ]; then
-	echo "MAC_ADDR in /etc/conf.d/bcm4329 not set, will use MAC set by device (expect this to be buggy)"
+	if [ ! -f "$CACHE" ]; then
+		echo 43:29:B1$(od -txC -An -N3 /dev/random|tr \  : | tr '[:lower:]' '[:upper:]') >"$CACHE"
+	fi
+	MAC_ADDR=`cat "$CACHE"`
+	echo "Warning: Using self generated MAC address! MAC_ADDR should be defined in /etc/conf.d/brcm43xx."
 else
-	MAC_OPTIONS="--bd_addr $MAC_ADDR"
+	[ -f "$CACHE" ] && rm "$CACHE"
 fi
-
+MAC_OPTIONS="--bd_addr $MAC_ADDR"
 
 a=`cat /sys/class/mmc_host/mmc0/mmc0\:0001/mmc0\:0001\:1/device`