ERROR: 256 KiB atomic DMA coherent pool is too small!
移植了一个USB网卡驱动，安装网卡后成了这样了root@freescale /etc$ usb 1-1: new high-speed USB device number 2 using ci_hdrc
===>rt2870_probe()!
--> RTMPAllocAdapterBlock
=== pAd = 90ac2000, size = 842296 ===
--> RTMPAllocTxRxRingMemory
ERROR: 256 KiB atomic DMA coherent pool is too small!
Please increase it with coherent_pool= kernel parameter!
<-- 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
本人用的IMX6UL-C2开发板 内核版本3.14.38
想知道如何能解决问题
您可以在uboot命令行修改bootargs添加coherent_pool的值，可以参考这篇文章：https://blog.csdn.net/aifei7320/article/details/50542363 ，不过我们这里也没遇到过这种问题，不能给您保证一定有效。
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