ERROR: 256 KiB atomic DMA coherent pool is too small!

zero_k

移植了一个USB网卡驱动，安装网卡后成了这样了
root@freescale /etc$ [  194.768731] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[  194.945072] ===>rt2870_probe()!
[  194.948294] --> RTMPAllocAdapterBlock
[  194.969513]
[  194.969513]
[  194.969513] === pAd = 90ac2000, size = 842296 ===
[  194.969513]
[  194.983952] --> RTMPAllocTxRxRingMemory
[  194.987848] ERROR: 256 KiB atomic DMA coherent pool is too small!
[  194.987848] Please increase it with coherent_pool= kernel parameter!
[  195.001106] <-- ERROR in Alloc Bulk buffer for HTTxContext!
[  195.006707] ---> RTMPFreeTxRxRingMemory
[  195.011089] <--- RTMPFreeTxRxRingMemory
[  195.014949] ERROR!!! Failed to allocate memory - TxRxRing
[  195.021727] <-- RTMPAllocAdapterBlock, Status=3
[  195.026348] 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

forqs

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。