UltraZed EV No longer detects JTAG devices

Question

I've been using an UltraZed EV board for software development, using the Xilinx toolchain for months, without many problems.

This week, I can no longer detect any devices under the JTAG chain. I've tried several different JTAG cables and systems (primary is a SmartLynq), I've tried different UltraZed EV boards, uninstalled, reinstalled software (including Xilinx cable drivers), changed the SOM Dip switches to JTAG boot mode, etc., etc., etc.

At first it was an intermittent problem, now I can virtually never see any devices on the JTAG chain. No JTAG Devices, no downloading software, no debugging, nothing. The UltraZed EV board itself seems fine: I can boot and run from QSPI, SD, etc. Its just that the Xilinx hardware server can't see any devices attached to JTAG.

So anyone have any other ideas of things to try? Unfortunately, working from home has limited the amount of hardware swapping I'd like to try.

TIA

wdf · Accepted Answer

So I was able to make it into the office yesterday. What appears to have happened is that my UltraZed Carrier board has developed a H/W fault that prevents it from enumerating the JTAG chain. I was able to enumerate the JTAG chain on a Zed Board as well as a second UltraZed board (although I could swear I tried that previously with no luck with the second UltraZed board). I also had a colleague verify my findings with his computer (using the SmartLynq and a VPN, he was able to do that remotely). Thanks to those who chimed in with suggestions. I'd still like to know what happened, but at least I'm up and back productive.

wdf · Answer

Yep, tried the direct USB Cable, the SmartLynq, the Platform Cable USB II, same reaction for all of them. Later today, I will try connecting to a ZedBoard and see if that works - trying to narrow the problem to either something with my PC or something with my UltraZed.