load_nandsim.sh: intruduce fatal function

And used it, which simplifies the code.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

diff --git a/load_nandsim.sh b/load_nandsim.sh
index a03b3077c9965f70a3c4b62d2fa51e1531a3e6d7..87d4f60866eaae3096492d29f9f9a623524d59a8 100755 (executable)
--- a/load_nandsim.sh
+++ b/load_nandsim.sh
@@ -7,9 +7,14 @@
 # Author: Artem Bityutskiy
 #
 
+fatal()
+{
+        echo "Error: $1" 1>&2
+        exit 1
+}
+
 if grep -q "NAND simulator" /proc/mtd; then
-       echo "Error: nandsim is already loaded"
-       exit 1
+       fatal "nandsim is already loaded"
 fi
 
 if [ "$#" -lt "1" ]; then
@@ -67,8 +72,7 @@ elif [ "$#" = "2" ]; then
 fi
 
 if [ "$PGSZ" -eq 512 ] && [ "$EBSZ" -ne "16" ]; then
-       echo "Error: only 16KiB eraseblocks are possible in case of 512 bytes page"
-       exit 1
+       fatal "only 16KiB eraseblocks are possible in case of 512 bytes page"
 fi
 
 if [ "$PGSZ" -eq "512" ]; then
@@ -78,8 +82,7 @@ if [ "$PGSZ" -eq "512" ]; then
        64)  modprobe nandsim first_id_byte=0x20 second_id_byte=0x36 ;;
        128) modprobe nandsim first_id_byte=0x20 second_id_byte=0x78 ;;
        256) modprobe nandsim first_id_byte=0x20 second_id_byte=0x71 ;;
-       *) echo "Flash size ${SZ}MiB is not supported, try 16, 32, 64 or 256"
-          exit 1 ;;
+       *) fatal "flash size ${SZ}MiB is not supported, try 16, 32, 64 or 256"
        esac
 elif [ "$PGSZ" -eq "2048" ]; then
        case "$EBSZ" in
@@ -87,8 +90,7 @@ elif [ "$PGSZ" -eq "2048" ]; then
        128) FOURTH="0x15" ;;
        256) FOURTH="0x25" ;;
        512) FOURTH="0x35" ;;
-       *)   echo "Eraseblock ${EBSZ}KiB is not supported"
-            exit 1
+       *)   fatal "eraseblock ${EBSZ}KiB is not supported"
        esac
 
        case "$SZ" in
@@ -97,17 +99,14 @@ elif [ "$PGSZ" -eq "2048" ]; then
        256) modprobe nandsim first_id_byte=0x20 second_id_byte=0xaa third_id_byte=0x00 fourth_id_byte="$FOURTH" ;;
        512) modprobe nandsim first_id_byte=0x20 second_id_byte=0xac third_id_byte=0x00 fourth_id_byte="$FOURTH" ;;
        1024) modprobe nandsim first_id_byte=0xec second_id_byte=0xd3 third_id_byte=0x51 fourth_id_byte="$FOURTH" ;;
-       *) echo "Unable to emulate ${SZ}MiB flash with ${EBSZ}KiB eraseblock"
-          exit 1
+       *) fatal "unable to emulate ${SZ}MiB flash with ${EBSZ}KiB eraseblock"
        esac
 else
-       echo "Error: bad NAND page size ${PGSZ}KiB, it has to be either 512 or 2048"
-       exit 1
+       fatal "bad NAND page size ${PGSZ}KiB, it has to be either 512 or 2048"
 fi
 
 if [ "$?" != "0" ]; then
-       echo "Error: cannot load nandsim"
-       exit 1
+       fatal "Error: cannot load nandsim"
 fi
 
 echo "Loaded NAND simulator (${SZ}MiB, ${EBSZ}KiB eraseblock, $PGSZ bytes NAND page)"