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