Refactor boot0 platform specific definition

Make it easier to manage new sku

files/Aboot/boot0.j2

@@ -216,6 +216,28 @@ EOF
     chmod a+r "${target_path}/machine.conf"
 }
 
+in_array() {
+    local value="$1"
+    shift
+
+    for other in $@; do
+        if [ "$value" = "$other" ]; then
+            return 0
+        fi
+    done
+
+    return 1
+}
+
+read_system_eeprom() {
+    if [ -x /bin/readprefdl ]; then
+        readprefdl -f /tmp/.system-prefdl -d > $target_path/.system-prefdl
+    elif [ -f /etc/prefdl ]; then
+        cp /etc/prefdl $target_path/.system-prefdl
+        chmod a+r $target_path/.system-prefdl
+    fi
+}
+
 platform_specific() {
     local platform="$(sed -nr 's/.*platform=([^ ]+).*/\1/p' "$cmdline_base")"
     local sid="$(sed -nr 's/.*sid=([^ ]+).*/\1/p' "$cmdline_base" | sed 's/Ssd$//')"
@@ -227,20 +249,21 @@ platform_specific() {
     local flash_size=$(($(df | grep -E "$flash_re" | tr -s ' ' | cut -f2 -d' ') / 1000))
 
     if [ "$platform" = "raven" ]; then
+        # Assuming sid=Cloverdale
         aboot_machine=arista_7050_qx32
         flash_size=2000
         docker_inram=on
         echo "modprobe.blacklist=radeon,sp5100_tco acpi=off docker_inram=on" >>/tmp/append
     fi
     if [ "$platform" = "crow" ]; then
+        # Assuming sid=Clearlake
         aboot_machine=arista_7050_qx32s
         flash_size=3700
         echo "modprobe.blacklist=radeon,sp5100_tco" >>/tmp/append
     fi
     if [ "$sid" = "Upperlake" ] || [ "$sid" = "UpperlakeES" ]; then
         aboot_machine=arista_7060_cx32s
         flash_size=3700
-        echo "amd_iommu=off" >> /tmp/append
     fi
     if [ "$sid" = "Gardena" ] || [ "$sid" = "GardenaE" ]; then
         aboot_machine=arista_7260cx3_64
@@ -271,23 +294,18 @@ platform_specific() {
         aboot_machine=arista_7280cr3_32d4
         flash_size=7382
     fi
-    if [ "$platform" = "rook" ] || [ "$platform" = "magpie" ] ||
-       [ "$platform" = "woodpecker" ]; then
+    if in_array "$platform" "rook" "magpie" "woodpecker"; then
         echo "tsc=reliable pcie_ports=native" >>/tmp/append
         echo "rhash_entries=1 usb-storage.delay_use=0" >>/tmp/append
-        if [ -x /bin/readprefdl ]; then
-           readprefdl -f /tmp/.system-prefdl -d > /mnt/flash/.system-prefdl
-        elif [ -f /etc/prefdl ]; then
-           cp /etc/prefdl /mnt/flash/.system-prefdl
-           chmod a+r /mnt/flash/.system-prefdl
-        fi
         echo "reassign_prefmem" >> /tmp/append
     fi
-    if [ "$platform" = "rook" ] || [ "$platform" = "magpie" ]; then
+    if in_array "$platform" "rook"; then
         echo "iommu=on intel_iommu=on" >>/tmp/append
+        read_system_eeprom
     fi
-    if [ "$platform" = "woodpecker" ]; then
+    if in_array "$platform" "crow" "woodpecker" "magpie"; then
         echo "amd_iommu=off modprobe.blacklist=snd_hda_intel,hdaudio" >> /tmp/append
+        read_system_eeprom
     fi
 
     if [ $flash_size -ge 28000 ]; then