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#!/bin/bash
#
# This script inserts NAND simulator module to emulate NAND flash of specified
# size.
#
# Author: Artem Bityutskiy
#
fatal()
{
echo "Error: $1" 1>&2
exit 1
}
if grep -q "NAND simulator" /proc/mtd; then
fatal "nandsim is already loaded"
fi
if [ "$#" -lt "1" ]; then
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
exit 1
fi
SZ="$1"
EBSZ="$2"
PGSZ="$3"
if [ "$#" = "1" ]; then
EBSZ="16"
PGSZ="512"
elif [ "$#" = "2" ]; then
PGSZ="512"
fi
if [ "$PGSZ" -eq 512 ] && [ "$EBSZ" -ne "16" ]; then
fatal "only 16KiB eraseblocks are possible in case of 512 bytes page"
fi
if [ "$PGSZ" -eq "512" ]; then
case "$SZ" in
16) modprobe nandsim first_id_byte=0x20 second_id_byte=0x33 ;;
32) modprobe nandsim first_id_byte=0x20 second_id_byte=0x35 ;;
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 ;;
*) fatal "flash size ${SZ}MiB is not supported, try 16, 32, 64 or 256"
esac
elif [ "$PGSZ" -eq "2048" ]; then
case "$EBSZ" in
64) FOURTH="0x05" ;;
128) FOURTH="0x15" ;;
256) FOURTH="0x25" ;;
512) FOURTH="0x35" ;;
*) fatal "eraseblock ${EBSZ}KiB is not supported"
esac
case "$SZ" in
64) modprobe nandsim first_id_byte=0x20 second_id_byte=0xa2 third_id_byte=0x00 fourth_id_byte="$FOURTH" ;;
128) modprobe nandsim first_id_byte=0xec second_id_byte=0xa1 third_id_byte=0x00 fourth_id_byte="$FOURTH" ;;
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" ;;
*) fatal "unable to emulate ${SZ}MiB flash with ${EBSZ}KiB eraseblock"
esac
else
fatal "bad NAND page size ${PGSZ}KiB, it has to be either 512 or 2048"
fi
if [ "$?" != "0" ]; then
fatal "Error: cannot load nandsim"
fi
echo "Loaded NAND simulator (${SZ}MiB, ${EBSZ}KiB eraseblock, $PGSZ bytes NAND page)"
exit 0
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