运行sample_hifb失败

hi3536使用2.0.2.0版本的SDK，运行sample_hifb出现[_IPCM_send_data, 191]: Wait mem flag to be free is timeout!

如下所示
/home/root/2.0.2.0ko # ./load3536 -i
HiSilicon media memory Zone Manager
Module himedia: init ok
hi3536_base: module license ‘Proprietary’ taints kernel.
Disabling lock debugging due to kernel taint
load sys.ko for Hi3536…OK!
load vdec.ko for dccm….OK
Load hi_tde.ko success.&nBSP; (SDK_version:[SDK_VERSION] Build Time:[Jun 7 2015, 19:26:15])
load region.ko ….OK!
load vgs.ko for Hi3536…OK!
load vpss.ko ….OK!
load vou.ko ….OK!
load venc.ko for dccm….OK
load ive.ko … OK!
HDMI_1080P60
0x63 = 0x40
acodec inited!
insert Audio
/home/root/2.0.2.0ko # cd ..
/home/root # ./sample_hifb

/**/
please choose the case which you want to run:
0: ARGB1555 standard mode + cursor
1: ARGB1555 BUF_DOUBLE mode
2: ARGB1555 BUF_ONE mode
3: ARGB1555 BUF_NONE mode
4: ARGB8888 BUF_NONE mode with compression
q: quit the whole sample
sample command:0
[_ipcm_send_data, 191]: Wait mem flag to be free is timeout!

若是运行2.0.6.0版本的SDK则在load3536时就会出现这个错误，如下所示：

load vou.ko ….OK!
[_ipcm_send_data, 191]: Wait mem flag to be free is timeout!

使用的是2G的ddr，主arm内存分配为512m，mmz也是512m。

想请教一下大家这是什么原因。。。。