Encryption error during DCP generation

Question

Hi,  
  
I am using on-prem setup for generating DCP checkpoints in HDK flow for multiple projects. So far, after updating the encrypt.tcl and other relevant files in build/scripts folder, I was able to generate checkpoints.  
  
But, with a recent project of mine, I am facing error, where AWS is saying there is nothing to encrypt. Below is the output where it throws error.

```
## encrypt -k $HDK_SHELL_DIR/build/scripts/vivado_keyfile_2017_4.txt -lang verilog  [glob -nocomplain -- $TARGET_DIR/*.{v,sv}] [glob -nocomplain -- $TARGET_DIR/*.vh] [glob -nocomplain -- $TARGET_DIR/*.inc]
ERROR: [Vivado 12-3330] encrypt 1735: Failed to encrypt ''./home/user/.Xilinx/.temp3fabed45-9f07-491c-89e9-867452be593b/vivado_keyfile_2017_4.txt: FileStructure::encrypt1735: Nothing to encrypt.
```

I have checked the hierarchy of the design, and also created the project from scratch multiple times, but this error stays same.  
  
Any pointers on what could be the issue would be really helpful.  
  
Thanks in advance.

Answer

Hi pradeepsi,  
  
We ran the cl_dram_dma example  and the encryption works for us.  
  
As we are unable to reproduce the issue you are facing, to root cause the issue you may run the encrypt command for each file in the $TARGET_DIR and see which file is causing this issue?  
  
Thanks,  
Sunil.

Answer

Hi pradeepsi,  
  
Can you please check if $TARGET_DIR is set?  
  
If it is set, do you have the required files under $TARGET_DIR?  
  
Let us know to assist you further.  
  
Thanks,  
Sunil.

Answer

Hi Sunil,  
  
Yes, the TARGET_DIR is set to src_post_encryption directory, and the RTL files does get copied to the folder. The vivado_keyfile_2017_4.txt file is also there at its default location.  
  
Thanks.  
  
Edit:  
I am able to generate DCP after disabling the encryption by commenting last two commands in encrypt.tcl.  
  
Edited by: pradeepsi on Jul 6, 2020 12:05 PM

Answer

Hi Sunil,  
  
I could identify the troubling file by running the command on individual files. Thanks for your help.  
  
Please provide feedback to developers for a more informed prints when this kind of errors occurs, which will really help in debugging for F1 users.  
  
Thanks again!

Encryption error during DCP generation

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