[GSoC 2021] Beagle BSP USB OTG Support

[Ahamed Husni]

Hi all,

I need to debug the Beaglebone Black using JTAG. I got a TI LaunchPad
CC1310. Launchpad has a XDS110 debugger with a (ARM - not sure) 10 pin JTAG
out which can be used to debug external targets. The Beaglebone has a cTI
20 pin JTAG interface. Pin layouts for the ARM10 and cTI20 is given here.

http://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_jtag_connectors.html#connector-information

Can we map the pins, point to point without adapters to debug the BBB using
Launchpads's XDS110?

Following is what I came up with just refering the above given pin layouts.

*ARM10 to cTI20*

1==5     (VTRef/VCC)
2==1     (SWDIO/TMS)
3==8    (GND)
4==9      (SWCLK/TCLK) SWDCLK(9) and TCK(11) are separate in cTI
5==10  (GND)
6==7    (SWO/TDO)
7 KEYED
8==3     (NC/TDI)
9==12   (GNDDetect)
10==15  (nRESET)

Will this work? (EMU pins are not used here)

Also I found a discussion in TI' forum which says,

"Controlling the EMU0 and EMU1 signals, which are mandatory to place the
AM335x in debug mode."

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/777331/am3358-how-to-evaluate-if-a-jtag-chain-works-correctly

Also the hardware Mod for libdebugger in RTEMS connects the SWO/TDO(7) to
the EMU0(13).

https://docs.rtems.org/branches/master/user/bsps/bsps-arm.html#debugging-using-libdebugger

My Project Proposal:
https://docs.google.com/document/d/1CN3ri7g6NJeFPb5h8y4smr1aziGWyXbiiXUsFMhdUu4/edit?usp=sharing

Best regards,
Husni Faiz.
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