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PART_NAME=firmware
# $(1): file to read magic from
# $(2): offset in bytes
get_magic_long_at() {
dd if="$1" skip=$2 bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
}
platform_machine() {
grep "machine" /proc/cpuinfo | sed "s/.*:[ \t]*//"
}
platform_expected_chk_board_id() {
local machine=$(platform_machine)
case "$machine" in
"Netgear WNDR4000") echo "U12H181T00_NETGEAR"; return;;
esac
}
platform_expected_cybertan_pattern() {
local machine=$(platform_machine)
case "$machine" in
"Linksys E1000 V2.1") echo "E100"; return;;
esac
}
brcm47xx_identify() {
local magic
magic=$(get_magic_long "$1")
case "$magic" in
"48445230")
echo "trx"
return
;;
"2a23245e")
echo "chk"
return
;;
esac
magic=$(get_magic_long_at "$1" 14)
[ "$magic" = "55324e44" ] && {
echo "cybertan"
return
}
echo "unknown"
}
platform_check_image() {
[ "$#" -gt 1 ] && return 1
local file_type=$(brcm47xx_identify "$1")
local magic
case "$file_type" in
"chk")
local header_len=$((0x$(get_magic_long_at "$1" 4)))
local board_id_len=$(($header_len - 40))
local board_id=$(dd if="$1" skip=40 bs=1 count=$board_id_len 2>/dev/null | hexdump -v -e '1/1 "%c"')
local dev_board_id=$(platform_expected_chk_board_id)
echo "Found CHK image with device board_id $board_id"
[ -n "$dev_board_id" -a "$board_id" != "$dev_board_id" ] && {
echo "Firmware board_id doesn't match device board_id ($dev_board_id)"
return 1
}
magic=$(get_magic_long_at "$1" "$header_len")
[ "$magic" != "48445230" ] && {
echo "No valid TRX firmware in the CHK image"
return 1
}
return 0
;;
"cybertan")
local pattern=$(dd if="$1" bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%c"')
local dev_pattern=$(platform_expected_cybertan_pattern)
echo "Found CyberTAN image with device pattern: $pattern"
[ -n "$dev_pattern" -a "$pattern" != "$dev_pattern" ] && {
echo "Firmware pattern doesn't match device pattern ($dev_pattern)"
return 1
}
magic=$(get_magic_long_at "$1" 32)
[ "$magic" != "48445230" ] && {
echo "No valid TRX firmware in the CyberTAN image"
return 1
}
return 0
;;
"trx")
return 0
;;
*)
echo "Invalid image type. Please use only .trx files"
return 1
;;
esac
}
platform_do_upgrade_chk() {
local header_len=$((0x$(get_magic_long_at "$1" 4)))
local trx="/tmp/$1.trx"
dd if="$1" of="$trx" bs=$header_len skip=1
shift
default_do_upgrade "$trx" "$@"
}
platform_do_upgrade_cybertan() {
local trx="/tmp/$1.trx"
dd if="$1" of="$trx" bs=32 skip=1
shift
default_do_upgrade "$trx" "$@"
}
platform_do_upgrade() {
local file_type=$(brcm47xx_identify "$1")
case "$file_type" in
"chk") platform_do_upgrade_chk "$ARGV";;
"cybertan") platform_do_upgrade_cybertan "$ARGV";;
*) default_do_upgrade "$ARGV";;
esac
}
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