1 files changed, 127 insertions, 0 deletions
diff --git a/nand-utils/load_nandsim.sh b/nand-utils/load_nandsim.sh
new file mode 100755
index 0000000..4d9f0cb
--- /dev/null
+++ b/nand-utils/load_nandsim.sh
@@ -0,0 +1,127 @@
+#!/bin/sh -euf
+
+#
+# This script inserts NAND simulator module to emulate NAND flash of specified
+# size.
+#
+# Author: Artem Bityutskiy
+#
+
+fatal()
+{
+        echo "Error: $1" 1>&2
+        exit 1
+}
+
+usage()
+{
+	cat 1>&2 <<EOF
+Load NAND simulator to simulate flash of a specified size.
+
+Usage: ${0##*/} <size in MiB> <eraseblock size in KiB> \\
+       <page size (512 or 2048)>
+
+Only the first parameter is mandatory. Default eraseblock size
+is 16KiB, default NAND page size is 512 bytes.
+
+Only the following combinations are supported:
+--------------------------------------------------
+| size (MiB) | EB size (KiB) | Page size (bytes) |
+--------------------------------------------------
+| 16         | 16            | 512               |
+| 32         | 16            | 512               |
+| 64         | 16            | 512               |
+| 128        | 16            | 512               |
+| 256        | 16            | 512               |
+| 64         | 64            | 2048              |
+| 64         | 128           | 2048              |
+| 64         | 256           | 2048              |
+| 64         | 512           | 2048              |
+| 128        | 64            | 2048              |
+| 128        | 128           | 2048              |
+| 128        | 256           | 2048              |
+| 128        | 512           | 2048              |
+| 256        | 64            | 2048              |
+| 256        | 128           | 2048              |
+| 256        | 256           | 2048              |
+| 256        | 512           | 2048              |
+| 512        | 64            | 2048              |
+| 512        | 128           | 2048              |
+| 512        | 256           | 2048              |
+| 512        | 512           | 2048              |
+| 1024       | 64            | 2048              |
+| 1024       | 128           | 2048              |
+| 1024       | 256           | 2048              |
+| 1024       | 512           | 2048              |
+--------------------------------------------------
+EOF
+}
+
+if grep -q "NAND simulator" /proc/mtd; then
+	fatal "nandsim is already loaded"
+fi
+
+if [ "$#" -lt "1" ]; then
+	usage
+	exit 1
+fi
+
+size="$1"
+eb_size="$2"
+page_size="$3"
+if [ "$#" = "1" ]; then
+	eb_size="16"
+	page_size="512"
+elif [ "$#" = "2" ]; then
+	page_size="512"
+fi
+
+if [ "$page_size" -eq 512 ] && [ "$eb_size" -ne "16" ]; then
+	fatal "only 16KiB eraseblocks are possible in case of 512 bytes page"
+fi
+
+first=
+second=
+third=
+fourth=
+
+if [ "$page_size" -eq "512" ]; then
+	first="0x20"
+	case "$size" in
+	16)  second=0x33 ;;
+	32)  second=0x35 ;;
+	64)  second=0x36 ;;
+	128) second=0x78 ;;
+	256) second=0x71 ;;
+	*) fatal "flash size ${size}MiB is not supported, try 16, 32, 64 or 256"
+	esac
+elif [ "$page_size" -eq "2048" ]; then
+	case "$eb_size" in
+	64)  fourth="0x05" ;;
+	128) fourth="0x15" ;;
+	256) fourth="0x25" ;;
+	512) fourth="0x35" ;;
+	*)   fatal "eraseblock ${eb_size}KiB is not supported"
+	esac
+
+
+	case "$size" in
+	64)   first="0x20"; second="0xa2"; third="0x00 ";;
+	128)  first="0xec"; second="0xa1"; third="0x00 ";;
+	256)  first="0x20"; second="0xaa"; third="0x00 ";;
+	512)  first="0x20"; second="0xac"; third="0x00 ";;
+	1024) first="0xec"; second="0xd3"; third="0x51 ";;
+	*) fatal "unable to emulate ${size}MiB flash with ${eb_size}KiB eraseblock"
+	esac
+else
+	fatal "bad NAND page size ${page_size}KiB, it has to be either 512 or 2048"
+fi
+
+first="first_id_byte=$first"
+second="second_id_byte=$second"
+[ -z "$third" ]  || third="third_id_byte=$third"
+[ -z "$fourth" ] || fourth="fourth_id_byte=$fourth"
+
+modprobe nandsim "$first" "$second" $third $fourth
+
+echo "Loaded NAND simulator (${size}MiB, ${eb_size}KiB eraseblock, $page_size bytes NAND page)"