shadow registers

[gkamendje73]

I was wondering if someone could give me some pointers on how to specify shadow registers in rggen.

[taichi-ishitani]

Hi @gkamendje73 ,

I think the indirect register type can be used for this purpose.

• Description
  • https://github.com/rggen/rggen/wiki/Register-Map-Specifications#indirect
• Example
  • https://github.com/rggen/rggen-sample/blob/92137aa2b90c145dfb59ef12c043603a8f101e41/block_0.yml#L123-L138

Please tell me more details of usage of the shadow register if the indirect register is not suitable.

[gkamendje73]

Hi @taichi-ishitani ,
Thanks for your answer. I will have a look at the indirect register type.

I was looking for something similar to this https://github.com/lowRISC/opentitan/blob/master/util/reggen/README.md#shadow-registers

[taichi-ishitani]

It seems that RgGen's indirect register and OpenTitan's shadow register are different.
However, RgGen supports the plugin feature so you can create your own plugin and add such register type support.

[gkamendje73]

Thanks for confirming.
I will be looking at the plugin interface.