That's a usb host driver. As I know, the whole usb subsystem
initialization would take up to 2 seconds while booting. In
another word, that will make the system booting time more
longer. So, I have to build all the usb driver as module and
insert them latter, when the system was usable.

On 2018年06月20日 16:01, Greg KH wrote:
> On Wed, Jun 20, 2018 at 02:36:52PM +0800, kipade wrote:
>> Now, most of kernel device are initialized by its driver according by
>> what described within device tree block. Here, the dtb was parsed
>> and used during kernel booting. If so, I want to load a device driver
>> after kernel booting using insmod, there would be no device tree
>> block present, so, the device would not be configured correctly.
>> so, how to make it usable?
> Why can you not build it into your kernel?
>
>
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