> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Peter Stuge > Sent: Thursday, July 03, 2008 1:19 PM > To: [email protected] > Subject: Re: [coreboot] USB debug cables and emulation > > On Thu, Jul 03, 2008 at 08:45:15AM -0400, Joseph Smith wrote: > > I'm thinking a Serial->USB debugger is the way to go > > Ok. Keep in mind that the serial port will probably not be able to > handle full speed data from the debugged target. I'm not sure what > the transfer overhead is, but I expect the debug device to be able > to shuffle quite a bit of data even though each transfer is only 8 > bytes max. > > > to keep the costs down > > As Tom pointed out, this is not a good argument. Serial will only be > simpler to implement, not lower cost to any degree that matters. > > > > Any suggestions, questions, comments? > > You might want to look into the speed thing. I believe the best way > to do so is to run tests on the NET20DC. > > > On Thu, Jul 03, 2008 at 12:28:47PM -0400, Joseph Smith wrote: > > $20 Dollars for a PCB??? I am going to use a generic PCB you can > > pick up at radio shack for 2 dollars. > > That will not work. There are no standalone USB 2 high-speed > function controllers that are usable with those PCBs. You will > have to design a PCB, or buy a devkit. > > > > This is more for educational, learning, and teaching purposes. > > Everything is not about money you know (or not) :-( > > Manufacturing electronics is VERY expensive, and I think the concern > is that you will either be spending ridiculous $$ or be forced to > shut down the project before finish, and that either would be a high > price for whatever knowledge has been gained. > > USB Debug Devices aren't the best target for learning USB in general > because the devices need to do some tricks here and there, and thus > require high end function controllers that can perform. >
So everyone is just telling me I should give up??? I wonder how many times OLPC herd that??? Ok then I will just give up and go buy a Net20DC :-( Thanks, Joseph Smith Set-Top-Linux www.settoplinux.org -- coreboot mailing list [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
