This marks BOOM version 2.2.2. The significant change is deprecation of boom-template, to switch to the unified Chipyard development platform, which incorporates flows for RTL simulation, FPGA simulation through FireSim, and physical design through HAMMER. The process to design custom BOOM-based SoCs is greatly simplified.

Chipyard usage is very similar to boom-template. See the Chipyard docs for details. https://chipyard.readthedocs.io/en/latest/

Chipyard is still in ALPHA,

Changes:

• Integration of PNR head (#284)
• RoCC accelerator support (#333, #324, #261, #221)
• Support for heterogeneous system (#309, #278, #271)
• Allow non-power-of-2 core width (#314, #316, #312)
• 4-cycle fetch with improved fetch buffer (#359, #358, #308)
• Refactored, modularized rename and dispatch stages (#347, #327, #304)
• Numerous QoR fixes (#344, #343, #342, #341, #340, #335, #334, #330, #329)
• Fixes for MMIO loads and stores (#346, #297)
• Support for software breakpoints (#354)
• Chipyard compatibility (#306)
• June 2019 rocketchip (#305)

This version should be used with the following commit of Chipyard (from the master branch): https://github.com/ucb-bar/chipyard/commit/9d58818c2a9911d6db50eeb15e7e25e64090ee19