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by rwmj 1653 days ago
That's sort of (if you squint a great deal) what you get with Chisel and RISC-V Rocket Chip. It's not drag and drop but you can customize the design to a certain extent just by editing some parameters in a file. It only applies to the cores and close components like the cache and off-chip links. There isn't a good integrated range of open source peripherals.

Old presentation about this: https://riscv.org/wp-content/uploads/2015/01/riscv-rocket-ch... especially slide 6