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I got an idea but don't known whether it will work. I noticed that the otg_whitelist.c from a standard kernel source code tree defined a test device with hard-coded vender id & product id which is allowed to pass the white list check. So in case that my device maker keeps it, it could be hopefull to substitute the testing vid & pid with those of my USB device, say, with a hex editor. I can pull down and push back the kernel binary I think.
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How to get through otg_whitelist check without kernel rebuilding?
