I've got a bucket full of jtag stuff that some dildo hasn't paid for so I guess I can give it away. You'll have to wait 'til I get back to Sydney tho. Warning! J-tag cables are much beliked by fluffy doggie.
brucee On Wed, Jul 27, 2011 at 2:58 AM, Gorka Guardiola <[email protected]> wrote: > On Tue, Jul 26, 2011 at 11:25 PM, Gorka Guardiola <[email protected]> wrote: >> On Tue, Jul 26, 2011 at 9:46 PM, erik quanstrom <[email protected]> >> wrote: >>> can someone point me at a list of plan9 usb/serial compatable >>> jtag programmers? >>> >> >> As far as I know, ft2232 chips and their variants may work, but I have only >> tried it with the Sheeva plug. >> >> The ft2232 serial chip inside the sheeva >> can drive all sorts of serial things, including input to a jtag state machine >> if connected properly. Inside the sheeva plug (and some other arm boards), >> the chip is actually connected to the jtag input of the SOC inside it, >> but you need >> the concret details on how this is done for what you are using. >> >> What I do is I program (this is what usb/serial does) the interface >> connected to >> the jtag for the right configuration to drive it. The device is also >> programmable >> and you need to program it (it is done so that the latency of the USB does >> not >> kill you). Then you need to communicate with the other side, which includes >> driving the reset bits (which depend on the concrete electronics connecting >> the >> serial chip to the jtag interface) and then sending the right commands. > > All this is done outside usb/serial. Only a couple of parameters (latency and > bit mode) are configured in usb/serial and a file is served. > > G. > >
