[Openocd-development] Error: JTAG scan chain interrogation failed: LOGIC ANALYZER results

Hi John, The RTCK is optional. If your JTAG emulator/interface does not support RTCK you MUST run your JTAG interface at 1/6 of the processor frequency. You have a ARM TDMI-s, also you should care about the processor frequency if you do not have the RTCK support from your JTAG interface. But

Re: [Openocd-development] [PATCH] arm11: significantly improve memory write performance

On Mon, Feb 8, 2010 at 11:31 PM, David Brownell wrote: > On Monday 08 February 2010, Ųyvind Harboe wrote: >> The reason why jtag_add_runtest() is so much faster than >> pathmove is that jtag_add_runtest() can be queued in >> a hardware fifo. > > But does this guarantee the same path transition? A

Re: [Openocd-development] [PATCH] arm11: significantly improve memory write performance

On Monday 08 February 2010, Øyvind Harboe wrote: > The reason why jtag_add_runtest() is so much faster than > pathmove is that jtag_add_runtest() can be queued in > a hardware fifo. But does this guarantee the same path transition? The ARM11 debug TAP cares about specific paths when the host is u

[Openocd-development] [PATCH] arm11: significantly improve memory write performance

by using jtag_add_runtest() instead of pathmove, the performance goes from 100kBytes/s for GDB load to 200kBytes/s @ 8MHz testing with imx31pdk. The reason why jtag_add_runtest() is so much faster than pathmove is that jtag_add_runtest() can be queued in a hardware fifo. gprof output: 62.59

[Openocd-development] Error: JTAG scan chain interrogation failed: all zeros

Hi All, I picked up a thread thru google.com that mentions the "interrogation failed" error, and am having that problem myself. http://www.mail-archive.com/openocd-development@lists.berlios.de/msg08501.ht ml

Re: [Openocd-development] imx31 breakpoints

On Mon, Jan 25, 2010 at 4:31 PM, Edgar Grimberg wrote: > On Sat, Jan 23, 2010 at 8:01 AM, David Brownell wrote: >> I fired up GDB against an ARM1136 with current git code and >> observed the "breakpoints work in Tcl, fail in GDB" problem. >> >> So I committed a fix that makes GDB work too, at lea

Re: [Openocd-development] JTAG/USB used educational context

On 02/07/2010 11:32 PM, David Brownell wrote: > On Sunday 07 February 2010, Julien Iguchi-Cartigny wrote: >> Hello David, >> >>> If you're using Linux, I suspect you just forgot to install >>> the UDEV rules which automatically set up access for you. >> >> I didn't have time to investigate but it s