Compile Error when adding CFG_CMD_PING

After adding CFG_CMD_PING to M5282EVB.h I get the compile error below. Anybody have an idea?

Stuart

#define CONFIG_COMMANDS ( CONFIG_CMD_DFL & CFG_CMD_PING & ~(CFG_CMD_LOADS | CFG_CMD_LOADB) )

env_flash.c: In function `env_relocate_spec':
env_flash.c:387: `flash_addr' undeclared (first use in this function) env_flash.c:387: (Each undeclared identifier is reported only once env_flash.c:387: for each function it appears in.) make[1]: *** [env_flash.o] Error 1
make[1]: Leaving directory `/home/stuart/src/u-boot/common'
make: *** [common/libcommon.a] Error 2