New project, litehm2: a hostmot2 port to linsn rv901t

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03 Jun 2023 17:51 #272824 by tuxcnc
I did some investigation, and it seems that Litex does not support Spartan 6 (RV901T board) and never will supports...

So, there are two solutions :
1. Do not use Litex.
2. Do not use RV901T.

Ad. 1
Source can be rewriten to Xilinx ISE 14.7 only project.
Good source compiled with good tools must gives good firmware.

Ad. 2
Source can be rewriten for Lattice and Colorlight 5A-7B board.
Litex support Lattice well.
There are some hardware problems (watchmaker's job with SSOP and complicated write to flash) but it can give good result.

RV901T + Litex = too many problems.
"It works for me" does not mean anything and is not a consolation when it not works for you.

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03 Jun 2023 18:08 #272825 by sensille

I did some investigation, and it seems that Litex does not support Spartan 6 (RV901T board) and never will supports...


github.com/enjoy-digital/litex/wiki/Cores-Ecosystem

Look for "Spartan-6".

"It works for me" does not mean anything and is not a consolation when it not works for you.


I can't do more than offering my help.

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03 Jun 2023 19:38 #272834 by IlyaKw

I did some investigation, and it seems that Litex does not support Spartan 6 (RV901T board) and never will supports...



 

On what basis did you come to that conclusion ?

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03 Jun 2023 19:41 #272835 by IlyaKw

Thanks for the clear instructions. I will link to this post from the README, if that's okay.


 

Use it as you wish at your own discretion.

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03 Jun 2023 20:19 #272836 by tuxcnc

 

I can't do more than offering my help.

You can.
You have got good idea, but (in my opinion) you chose bad way.
Leave Litex, or leave RV901T.

On what basis did you come to that conclusion ?

I count warnings produced by compilation process.
It is about 750 (seven hundreds and fifty warnings !!!).
I never will believe it can give good firmware.

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11 Jun 2023 16:23 #273337 by sensille

I count warnings produced by compilation process.
It is about 750 (seven hundreds and fifty warnings !!!).
I never will believe it can give good firmware.


Most warning in Xilinx are not an indications for real problems. Xilinx is infamous for the number of warnings their tools generate. Even if you just use their provided cores you can easily end up with more warnings.
Most of them are just informational, like "look, I was able to optimize your circuit here!". Or unused connections.
The hard task is to find the real warnings in there. The xilinx IDE offers tons of filter capabilities for that.

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11 Jun 2023 21:26 #273353 by tuxcnc
Well, I bought two RV901T, so I will try.
But I'm not an optimist...

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12 Jun 2023 04:48 #273368 by sensille
There migh be an issue with an overfull FPGA. If you give me the board.conf you are trying to build I can build and test it myself.

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18 Jun 2023 10:01 #273773 by tuxcnc

There migh be an issue with an overfull FPGA.
 

I confirm, I tried, a more complex firmware do not fit in Spartan 6.
It is another good reason why you should replace RV901T by 5A-75B.

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