从开发板拷贝文件到u盘,文件比较大时,会出现系统报错,同时usb总线无法使用,出现这种问题的原因是echi总线吞吐量过大,修改/drivers/usb/host/ehci-hcd.c文件,将变量park的值改为0,可以解决该问题 /* initial park setting: slower than hw default */ static unsigned park = 0; module_param (park, uint, S_IRUGO); MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets"); |
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