NVRAM_TLV_ENVP_DATA_LEN
data_len = NVRAM_TLV_ENVP_DATA_LEN(&env);
env_len = NVRAM_TLV_ENVP_DATA_LEN(env);
error = bhnd_nvram_parse_env(env->envp, NVRAM_TLV_ENVP_DATA_LEN(env),