-"addip=setenv bootargs $(bootargs) ip=$(ipaddr):$(serverip):$(gatewayip)" \
- ":$(netmask):$(hostname):$(netdev):off\0" \
-"addhw=setenv bootargs $(bootargs) hw=$(hw) key1=$(key1) panic=1\0" \
+"addip=setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gatewayip}" \
+ ":${netmask}:${hostname}:${netdev}:off\0" \
+"addhw=setenv bootargs ${bootargs} hw=${hw} key1=${key1} panic=1\0" \