Hi there,
I'm looking into the sticky errors that I get when starting up OpenOCD
with a Flyswatter interface and BeagleBoard-XM. The code comments
indicate that "If the current transaction has not finished by the time
the next one must begin, and the ORUNDETECT bit is set in the
DP_CTRL_STAT register, the SSTICKYORUN status is set and further AP
operations will fail".
Googling returns numerous instances of this error for various
interfaces and board combinations. Some solutions I've seen are to
increase/decrease the JTAG speed in the target config using the
adapter_khz setting.
I'm trying to understand these errors better and have the following questions:
1. Are these errors spurious, in that they don't seem to effect
debugging after they occur?
2. If question 1 answer is No, where should I look next? Do I need
to read the applicable specs referenced in the code and debug it's
implementation in OpenOCD? Do I just play with JTAG speeds until I
find what works?
Here's the setup I'm using to test:
Open On-Chip Debugger 0.6.0-dev-00528-g63e5386 (2012-04-24-16:11)
Board: BeagleBoard-xm (v.A2) (ti_beagleboard_xm.cfg)
Interface: Flyswatter (flyswatter.cfg)
StartUp results in the following:
wmat@ayr ~/openocd-bin $ sudo openocd -f interface/flyswatter.cfg -f
board/ti_beagleboard_xm.cfg -c 'init'
Open On-Chip Debugger 0.6.0-dev-00528-g63e5386 (2012-04-24-16:11)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.sourceforge.net/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'jtag'
10 kHz
Warn : dm37x.dsp: huge IR length 38
trst_only separate trst_push_pull
Info : clock speed 10 kHz
Info : JTAG tap: dm37x.jrc tap/device found: 0x0b89102f (mfg: 0x017,
part: 0xb891, ver: 0x0)
Info : JTAG tap: dm37x.dap enabled
Info : dm37x.cpu: hardware has 6 breakpoints, 2 watchpoints
Error: JTAG-DP STICKY ERROR
Error: MEM_AP_CSW 0x80000042, MEM_AP_TAR 0x54011140
Error: JTAG-DP STICKY ERROR
Error: MEM_AP_CSW 0x80000042, MEM_AP_TAR 0x54011140
Error: JTAG-DP STICKY ERROR
Error: MEM_AP_CSW 0x80000042, MEM_AP_TAR 0x54011140
Error: JTAG-DP STICKY ERROR
Error: MEM_AP_CSW 0x80000042, MEM_AP_TAR 0x54011140
Error: JTAG-DP STICKY ERROR
Error: MEM_AP_CSW 0x80000042, MEM_AP_TAR 0x54011150
Error: JTAG-DP STICKY ERROR
Error: MEM_AP_CSW 0x80000042, MEM_AP_TAR 0x54011150
Error: JTAG-DP STICKY ERROR
Error: MEM_AP_CSW 0x80000042, MEM_AP_TAR 0x540111c0
Error: JTAG-DP STICKY ERROR
Error: MEM_AP_CSW 0x80000042, MEM_AP_TAR 0x540111c0
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