sw-update: fix nrhw20 support

recipes-core/sw-update/sw-update/am335x-nrhw20/sw_update_config

@@ -1,5 +1,6 @@
-PLATFORM_FIRST_PARTITION="/dev/mmcblk1p1"
-PLATFORM_SECOND_PARTITION="/dev/mmcblk1p2"
+PLATFORM_MAIN_STORAGE="/dev/mmcblk1"
+PLATFORM_FIRST_PARTITION=$PLATFORM_MAIN_STORAGE"p1"
+PLATFORM_SECOND_PARTITION=$PLATFORM_MAIN_STORAGE"p2"
 PLATFORM_PROD_COMPATIBILITY=
 PLATFORM_HW_VERSION=
 get_active_partition()

recipes-core/sw-update/sw-update/sw-update.sh

@@ -247,7 +247,7 @@ update_uboot()
     return
   fi
 
-  dd if=$1 of=/dev/mmcblk0 bs=512 seek=768 &> /dev/null
+  dd if=$1 of=$PLATFORM_MAIN_STORAGE bs=512 seek=768 &> /dev/null
   if [ $? -ne 0 ]; then
     log ERROR "Failed to write u-boot to mmcblk0"
     return
@@ -267,9 +267,9 @@ update_spl()
     return
   fi
 
-  dd if=$1 of=/dev/mmcblk0 bs=512 seek=256 &> /dev/null
+  dd if=$1 of=/dev/$PLATFORM_MAIN_STORAGE bs=512 seek=256 &> /dev/null
   if [ $? -ne 0 ]; then
-    log ERROR "Failed to write spl to mmcblk0"
+    log ERROR "Failed to write spl to $PLATFORM_MAIN_STORAGE"
     return
   fi
   log INFO "spl update succeed!"
@@ -277,6 +277,11 @@ update_spl()
 
 ############################ Start of script ###################################
 
+if [ ! -b $PLATFORM_MAIN_STORAGE ]; then
+  log ERROR "Storage $PLATFORM_MAIN_STORAGE does not exist, please fix /etc/default/sw_update_config"
+  exit 1
+fi
+
 while getopts ":l:u:s:h" opt; do
   case $opt in
     l)

recipes-core/sw-update/sw-update/sw_update_config

@@ -1,5 +1,6 @@
-PLATFORM_FIRST_PARTITION="/dev/mmcblk0p1"
-PLATFORM_SECOND_PARTITION="/dev/mmcblk0p2"
+PLATFORM_MAIN_STORAGE="/dev/mmcblk0"
+PLATFORM_FIRST_PARTITION=$PLATFORM_MAIN_STORAGE"p1"
+PLATFORM_SECOND_PARTITION=$PLATFORM_MAIN_STORAGE"p2"
 PLATFORM_PROD_COMPATIBILITY=
 PLATFORM_HW_VERSION=
 get_active_partition()