Change all '$(...)' variable references into '${...}'
which makes the environment compatible with the hush shell.
WARNING: Support for the old '$(...)' syntax will be
discontinued in a later version.
diff --git a/include/configs/atc.h b/include/configs/atc.h
index 881a4ca..bf6c170 100644
--- a/include/configs/atc.h
+++ b/include/configs/atc.h
@@ -113,8 +113,8 @@
 #define CONFIG_BOOTCOMMAND						\
 	"bootp;"							\
 	"setenv bootargs root=/dev/nfs rw "				\
-	"nfsroot=$(serverip):$(rootpath) " 				\
-	"ip=$(ipaddr):$(serverip):$(gatewayip):$(netmask):$(hostname)::off;"\
+	"nfsroot=${serverip}:${rootpath} " 				\
+	"ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off;"\
 	"bootm"
 
 /*-----------------------------------------------------------------------