OpenWrt – Rev 1

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

START=02
alias debug=${DEBUG:-:}

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_linksys() {
        # 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 ))"

        [ -n "$(nvram get vxkilled)" ] && boardtype=0 # don't mess with the ram settings on the hacked cfe
        case "$(( $boardtype ))" in
                "1800") #0x708
                        if [ "$adm_switch" = 0 ]; then
                                nvram_set sdram_init "$(printf 0x%04x $(( $(/usr/sbin/nvram get sdram_init) | 0x0100 )))"
                                [ "$COMMIT" = 1 ] && {
                                        nvram_set 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_ncdl 0x0
                                nvram_set pa0itssit 62
                                nvram_set pa0b0 0x168b
                                nvram_set pa0b1 0xfabf
                                nvram_set pa0b2 0xfeaf
                                nvram_set pa0maxpwr 0x4e
                        }
                ;;
                "1071") #0x042f
                        # do sanity check first! max 0x0011 = 128mb
                        SDRAM_INIT=$(printf %d $(/usr/sbin/nvram get sdram_init))
                        [ "$SDRAM_INIT" -lt "9" -o "$SDRAM_INIT" -gt "17" ] && {
                                # set this to default: 0x09 only if value is invaild like 16MB on Asus WL-500GP
                                echo "sdram_init is invaild: $(printf 0x%04x $SDRAM_INIT), force to default!"
                                nvram_set sdram_init 0x0009
                        }
                        # on WRT54G3GV2 set flag, so checksum errors of firmware image 2 don't stop the boot process
                        noset_try_flag=$(nvram get noset_try_flag)
                        [ "$noset_try_flag" = 0 ] && {
                                echo "setting noset_try_flag to 1."
                                nvram_set noset_try_flag 1
                        }
                        [ "$COMMIT" = 1 ] && {
                                nvram_set sdram_ncdl 0x0
                        }
        esac
}

start() {
        # Don't do any fixups on the WGT634U
        [ "$(cat /proc/diag/model)" = "Netgear WGT634U" ] && return

        fixup_linksys

        # OFDM Power Offset is set incorrectly on many boards.
        # Setting it to 0 will increase the tx power to normal levels.
        nvram_set opo 0x0

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

        [ "$(nvram get et0macaddr)" = "00:90:4c:c0:00:08" ] && {
                # OvisLink WL-1600GL mac workaround
                nvram set et0macaddr=$(hexdump -n 6 -s 130976 -e '5/1 "%02x:" "%02x" ' /dev/mtd/0)
                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}')
        }

        [ "$COMMIT" = "1" ] && nvram commit
}