I am trying to use rocket core as a baseline core and add some additional features for research purpose, but I can't find where or how to change the value "xLen".
How to config xLen in rocket core?
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Rocket Chip uses a default
XLenof 64 in it'sDefaultConfig. However, this can be changed to 32 via a different top-level System configuration ofDefaultRV32Config.If you're working with the Rocket Chip emulator, you can compile these two different configurations with
For reference, take a look at the Rocket Chip System configurations defined in the
systempackage as well as thesubsystemconfigurations:src/main/scala/system/Configs.scalasrc/main/scala/subsystem/Configs.scalaThe former defines
DefaultConfigandDefaultRV32Config. The latter definesWithRV32.WithRV32is what changesXLento 32 (and also setsfLento 32). Alternatively, you can replicate the behavior ofWithRV32in your own subclass ofConfig.