On Mon, Jun 20, 2011 at 4:44 PM, Laurent Gauch <[email protected]> wrote: >> only one transport option; autoselect 'jtag' >> > interface_signal list >> interface_signal list >> Interface Signal Name | Mask | Value >> ---------------------------------------------------------- >> > interface_signal add led 8000 >> interface_signal add led 8000 >> There are no signals defined yet. >> > interface_signal list >> interface_signal list >> Interface Signal Name | Mask | Value >> ---------------------------------------------------------- >> led | 0x00008000 | 0x00008000 >> >> > bitbang led=lo >> bitbang led=lo >> ftdi_write_data: USB device unavailable >> Unable to write signal: led >> in procedure 'bitbang' >> >> > bitbang led >> bitbang led >> ftdi_write_data: USB device unavailable >> Unable to read signal: led >> in procedure 'bitbang' > > Does OpenOCD need to handle this kind of bitbang fonction from TCL ? > > For me, it does not, because it is too DANGEROUS for both the dongle and > target ... > > PLEASE COMMENT > > The problem is that the result of a bit-bang procedures will be dongle and > layout specific. There are too many chances for the end-user to create > short-circuit in the dongle or on the dongle port to the target board. > > Also, we should not use and/or provide the possibility to the end-user to > manage himself the bitbang of the dongle port, from TCL or from any other > access. > This is JUST not the JOB of openocd but the job of other pieces of software > (as manufacturer post-production test program ...). > > ALL dongle port access should be controlled and checked in the FT2232.c. The > FT2232 should not give to higher layer the possibility to have an direct > access to the dongle port. > > Regards, > Laurent > http://www.amontec.com/jtagkey.shtml > Amontec JTAGkey-2 : HIGH SPEED USB JTAG CABLE ADAPTER DONGLE DRIVER >
I don't think this is heavily an issue here. This functionality might be disabled by default and not recommended for inclusion in distributions. But easy way to write drivers for custom dongles in config files heavily reduces costs of development and production. S. _______________________________________________ Openocd-development mailing list [email protected] https://lists.berlios.de/mailman/listinfo/openocd-development
