Coral TPU, how to install?

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Caennanu

Member
May 18, 2021
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Since the TPU chips are tiny, looking at the picture of the dual-TPU M.2 card I suspect the larger chips are some sort of PCIe bridge or switch chips. That would allow the card to split the lanes itself, without help from the host system. I can't imagine it would be possible to 'auto-sense' the need for bifurcation and then split the lanes on the host side.
That could be very well possible. i only know what i know. and i don't what i don't. And in this case, i simply know it works. Just not the how.

And if needed, there's always makersfab: GitHub - magic-blue-smoke/Dual-Edge-TPU-Adapter: Dual Edge TPU Adapter to use it on a system with single PCIe port on m.2 A/B/E/M slot
 
Last edited:

UhClem

just another Bozo on the bus
Jun 26, 2012
432
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NH, USA
... so i'm geussing its auto sensing the bifurcation need? i donno. ...
(I'm very prejudiced toward "knowing", and not "guessing" ... :) )
Could you please issue the following command both at a shell prompt in Unraid itself, and at a shell prompt in your Ubuntu VM:
sudo lspci -nnvv -d1ac1: | grep -e 1ac1 -e LnkCap: -e LnkSta: > UnrOut.txt (in Unraid)
and
sudo lspci -nnvv -d1ac1: | grep -e 1ac1 -e LnkCap: -e LnkSta: > UbuOut.txt (in Ubuntu)
and Attach both files to your reply.
[Note that those are "one's" (vs ell's) in 1ac1]

Thank you.
 

Caennanu

Member
May 18, 2021
118
8
18
(I'm very prejudiced toward "knowing", and not "guessing" ... :) )
Could you please issue the following command both at a shell prompt in Unraid itself, and at a shell prompt in your Ubuntu VM:
sudo lspci -nnvv -d1ac1: | grep -e 1ac1 -e LnkCap: -e LnkSta: > UnrOut.txt (in Unraid)
and
sudo lspci -nnvv -d1ac1: | grep -e 1ac1 -e LnkCap: -e LnkSta: > UbuOut.txt (in Ubuntu)
and Attach both files to your reply.
[Note that those are "one's" (vs ell's) in 1ac1]

Thank you.
Ran the commands. Both in the ubuntu VM as in unraid. both create a file without content?
 

UhClem

just another Bozo on the bus
Jun 26, 2012
432
245
43
NH, USA
Ran the commands. Both in the ubuntu VM as in unraid. both create a file without content?
That is disappointing. And, surprising, since you had written (earlier):
What i mean is, that the dual edge tpu recognizes both tpu's individually while on the same slot.
so i'm geussing its auto sensing the bifurcation need? i donno.
Or, maybe, just maybe, the sudo was harmful (and not just superfluous) ...

From the Coral developers (at [Link]) :
Once rebooted, verify that the accelerator module is detected:
lspci -nn | grep 089a
You should see something like this:
03:00.0 System peripheral: Device 1ac1:089a
The 03 number and System peripheral name might be different, because those are host-system specific, but as long as you see a device listed with 089a then you're okay to proceed.
So, assuming you have (at least one) Coral TPU device installed (physically), and functional (visible on the PCIe bus), please do:
lspci -nnvv -d:089a | grep -e 089a -e LnkCap: -e LnkSta: > UnrOut.txt (in Unraid)
and
lspci -nnvv -d:089a | grep -e 089a -e LnkCap: -e LnkSta: > UbuOut.txt (in Ubuntu)

I hope we can figure this out -- thanks for hanging in ...
 

Caennanu

Member
May 18, 2021
118
8
18
That is disappointing. And, surprising, since you had written (earlier):
.....
Sorry it took a bit.
Code:
Ubuntu VM:
lspci -nnvv -d:089a | grep -e 089a -e LnkCap: -e LnkSta:
05:00.0 System peripheral [0880]: Global Unichip Corp. Coral Edge TPU [1ac1:089a] (prog-if ff)
        Subsystem: Global Unichip Corp. Coral Edge TPU [1ac1:089a]

Unraid:
03:00.0 System peripheral [0880]: Global Unichip Corp. Coral Edge TPU [1ac1:089a] (prog-if ff)
        Subsystem: Global Unichip Corp. Coral Edge TPU [1ac1:089a]
                LnkCap: Port #1, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
                LnkSta: Speed 5GT/s, Width x1
It seems... its only detecting 1 tpu... darn. Time to order the 2 pci lane adapter from makersfab...