source: freewrt/package/base-files/default/etc/init.d/S05nvram@ f200c25

#!/bin/sh
# NVRAM setup
#
# This file handles the NVRAM quirks of various hardware.

alias debug=${DEBUG:-:}

remap () {
        for type in lan wifi wan pppoe
        do
                for s in '' s
                do
                        eval nvram set ${type}_ifname$s=\"$(nvram get ${type}_ifname$s|sed s/$1/$2/g)\" 
                done
        done
}

nvram_default() {
        [ -z "$(nvram get $1)" ] && nvram set "$1=$2"
}

nvram_set() { # for the linksys fixup part
        [ "$(nvram get "$1")" = "$2" -a "$2" != "" ] || {
                COMMIT=1
                /usr/sbin/nvram set "$1=$2"
        }
}

fixup_lan() { # fix for wrong lan_ifnames default
        lan_ifnames="$(nvram get lan_ifnames)"
        [ "${lan_ifnames%% *}" = "$1" ] || \
                nvram set lan_ifnames="$2"
}

# work around braindead CFE defaults in linksys routers
boardtype=$(nvram get boardtype)
boardnum=$(nvram get boardnum)
boardflags=$(($(nvram get boardflags)))
adm_switch="$(( ($boardflags & 0x80) >> 7 ))"

case "$(( $boardtype ))" in
        "1800") #0x708
                if [ "$adm_switch" = 0 ]; then
                        nvram_set sdram_init "$(printf 0x%04x $(( $(/usr/sbin/nvram get sdram_init) | 0x0100 )))"
                        [ "$COMMIT" = 1 ] && {
                                nvram_set sdram_config 0x0062
                                nvram_set clkfreq 216
                                nvram_set sdram_ncdl 0x0
                                nvram_set pa0itssit 62
                                nvram_set pa0b0 0x15eb
                                nvram_set pa0b1 0xfa82
                                nvram_set pa0b2 0xfe66
                                nvram_set pa0maxpwr 0x4e
                        }
                fi
        ;;
        "1127") #0x467
                nvram_set sdram_init "$(printf 0x%04x $(( $(/usr/sbin/nvram get sdram_init) | 0x0100 )))"
                [ "$COMMIT" = 1 ] && {
                        nvram_set sdram_config 0x0062
                        nvram_set sdram_ncdl 0x0
                        nvram_set pa0itssit 62
                        nvram_set pa0b0 0x168b
                        nvram_set pa0b1 0xfabf
                        nvram_set pa0b2 0xfeaf
                        nvram_set pa0maxpwr 0x4e
                }
        ;;
esac
[ "$COMMIT" = "1" ] && nvram commit

# linksys bug; remove when not using static configuration for lan
nvram set lan_proto="static"

# hacks for wrt54g 1.x hardware
[  "$boardnum"  = "42" \
-a "$boardtype" = "bcm94710dev" ] && {
        debug "### wrt54g 1.x hack ###"
        remap eth0 vlan2
        remap eth1 vlan1
        nvram_default vlan1hwname "et0"
        nvram_default vlan2hwname "et0"
        nvram_default lan_ifnames "vlan2 eth2"
}

# hacks for asus wl-500g deluxe
[  "$boardnum"  = "45" \
-a "$boardtype" = "bcm95365r" ] && {
        debug "### wl-500g deluxe hacks ###"
        remap eth0.1 vlan0
        remap eth0 vlan1
        nvram_default vlan0hwname "et0"
        nvram_default vlan1hwname "et0"
        nvram_default lan_ifnames "vlan0 eth1"

        # set up the vlan*ports variables for the asus wl-500g deluxe
        # if they don't already exist 
        nvram_default vlan0ports "1 2 3 4 5*"
        nvram_default vlan1ports "0 5"
}

# hacks for asus
[ "$boardnum" = "asusX" ] && {
        debug "### asus hacks ###"
        case "$(($(nvram get et1phyaddr)))" in
                1) # WL-HDD
                        lan=eth1
                        wan=none
                ;;
                *)
                        lan=eth0
                        [ "$boardtype" = "bcm94710dev" ] && wan=eth1 || wan=none
                ;;
        esac

        fixup_lan "$lan" "$lan eth2"
        nvram_default wan_ifname "$wan"
}

# hacks for wap54g hardware
[  "$boardnum" = "2" \
-o "$boardnum" = "1024" ] && {
        debug "### wap54g hack ###"
        nvram_default wan_ifname "none"
        nvram_default lan_ifnames "eth0 eth1"
}

# hacks for buffalo wla2-g54l
[  "$boardnum" = "00" \
-a "$product_name" = "Product_name" \
-o "$product_name" = "WLA2-G54L" ] && {
        debug "### wla2-g54l hacks ###"
        nvram_default wan_ifname "none"
        fixup_lan "vlan0" "vlan0 eth1"
        nvram_default vlan0ports "1 2 5t"
        nvram_default vlan1ports "3 4 5t"
}

# wrtsl54gs vlan defaults
[  "$boardtype" = "0x042f" \
-a "$boardnum" = "42" \
-a "$boardflags" = "24" ] && {
        nvram_default vlan0hwname "et0"
        nvram_default vlan0ports "0 1 2 3 5u"
        nvram_default vlan1hwname "et0"
        nvram_default vlan1ports "4 5"
}

# needed at least for wrt54gs v1.1 and wrt54g v2.0, v2.2
[ \! -z "$(nvram get boardrev)" ] && {
        nvram_default wl0id 0x4320
}

# hack for some motorola routers
nvram unset wl0gpio0

# defaults, can be overridden by hardware-specific nvram_default commands
nvram_default lan_ifname "br0"
nvram_default lan_ifnames "vlan0 eth1 eth2"

nvram_default wan_ifname "vlan1"
nvram_default wan_device "vlan1"
nvram_default wan_proto "dhcp"

nvram_default wl0_ssid FreeWRT
nvram_default wl0_mode ap
nvram_default wl0_infra 1
nvram_default wl0_radio 1

WAN_PROTO="$(nvram get wan_proto)"
WAN_IFNAME="$(nvram get wan_ifname)"
case "$WAN_PROTO" in
        pp*) [ "${WAN_IFNAME%%[0-9]*}" = "ppp" ] || nvram set wan_ifname=ppp0;;
        *) [ "${WAN_IFNAME%%[0-9]*}" = "ppp" ] && nvram set wan_ifname="$(nvram get wan_device)";;
esac

[ "$(nvram get il0macaddr)" = "00:90:4c:5f:00:2a" ] && {
        # if default wifi mac, set two higher than the lan mac
        nvram set il0macaddr=$(nvram get et0macaddr|
        awk '{OFS=FS=":";for(x=7,y=2;--x;){$x=sprintf("%02x",(y+="0x"$x)%256);y/=256}print}')
}