海思3516加载mt7601u WiFi的问题

移植的MT7601u wifi驱动，加载后报以下错误：/nfsroot/wifi_test # insmod mt7601Usta.ko
rtusb init rt2870 --->
===>rt2870_probe()!
--> RTMPAllocAdapterBlock
=== pAd = c4e20000, size = 841592 ===--> RTMPAllocTxRxRingmemory
<-- ERROR in Alloc Bulk buffer for HTTxContext!
---> RTMPFreeTxRxRingMemory
<--- RTMPFreeTxRxRingMemory
ERROR!!! Failed to allocate memory - TxRxRing
<-- RTMPAllocAdapterBlock, Status=3
rt2870: probe of 1-1:1.0 failed with error -1
usbcore: registered new interface driver rt2870
/nfsroot/wifi_test #
这是什么原因？？