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imx6 kernel crash when access usb register

Question asked by Mostion M on Sep 19, 2017
Latest reply on Sep 19, 2017 by Mostion M

Hi all,

   there is a strange issue about my imx6 platform. the kernel version is 3.10.7. we use one usb otg port and one usb host port, and the OTG VBUS is external 5V. I just want to know, which conditions will cause the kernel can't access the USB register, I mean, if we want to access these register by some system functions like ioremap/mmap, and when we read/write the pointer of these functions returns, the kernel will crash, and no more message print. it just like the CPU strike suddenly.