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blackmagic-debug / blackmagic

In application debugger for ARM Cortex microcontrollers.
GNU General Public License v3.0
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BeagleBone Black support #166

Open gsmcmullin opened 7 years ago

gsmcmullin commented 7 years ago

The BeagleBone black is a low cost board based on the TI AM335x Cortex-A8. The existing support for Cortex-A in BMP should work with this core, except that the ADIv5 JTAG-DP is not directly exposed, it's hidden behind the 'ICEPICK Module'.

To expose the JTAG-DP on the scan chain:

The fact that the topology of the scan chain changes dynamically is problematic. The current scan code in BMP resets the JTAG logic, which will disconnect the JTAG-DP. Some refactoring around JTAG scanning and reset abstraction will be needed before this support can be added.

gsmcmullin commented 7 years ago

AM335x TRM: http://www.ti.com/lit/pdf/spruh73 ICEPICK_D config info: http://processors.wiki.ti.com/images/f/f6/Router_Scan_Sequence-ICEpick-D.pdf TI Wiki page: http://processors.wiki.ti.com/index.php/ICEPICK