[GSoC 2021] Beagle BSP USB OTG Support

[Christian MAUDERER]

Hello Ahamed,

I'm using a J-Link to debug Beagle. I think that it doesn't have a EMU 
pin either. Only difference: It has an additional TRST. I would suggest 
to just try it.

I think on OpenOCD there are a few options regarding RST. You can have 
SRST only, TRST only, both connected together and both as separate pins.

Best regards

Christian

Am 10.05.21 um 06:09 schrieb 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 
> <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 
> <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 
> <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 
> <https://docs.google.com/document/d/1CN3ri7g6NJeFPb5h8y4smr1aziGWyXbiiXUsFMhdUu4/edit?usp=sharing>
> 
> Best regards,
> Husni Faiz.
> 

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