On 2014-08-04 10:21, Alan Stern wrote: > On Mon, 4 Aug 2014, Austin S Hemmelgarn wrote: > >> On 2014-08-02 09:48, Alan Stern wrote: >>> On Sat, 2 Aug 2014, Nick Krause wrote: >>> >>>> Hey Sharp, >>>> After reading around seems people want support for usb debugging in >>>> kgdb or other usb based solutions. >>>> If you and the other developers are able to help me out a bit as I am >>>> new I can definitively write this >>>> area of kgdb support. >>> >>> Doesn't kgdb already support USB for debugging? >>> >>> Alan Stern >> >> AFAICT, on x86 it only supports using either a console capable serial >> port (so you could do that over USB if you have USB serial console >> support built-in, but most people I know don't compile that in, and in >> fact that is the only reason that i compile USB serial support in >> instead of making it a module), and an AT compatible keyboard with any >> console option. > > What about with a USB debugging device (CONFIG_EARLY_PRINTK_DBGP)? > That's how debugging over USB is _supposed_ to be done. Yes, except those are really expensive, and on some it's pretty easy if you don't know what you are doing to really screw things up. > >> It would be really nice to have USB keyboard support in >> there so that you don't have to reboot with special options and extra >> hardware plugged in to get to the debugger, although doing something >> that supports more than just the HID boot protocol will probably be tricky. > > Is there some reason why kgdb doesn't simply use the kernel's input > layer? If there is, that same reason probably prevents it from using > USB. > I believe it's to minimize the in-kernel dependencies.
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