Over the past several months, we’ve been working to provide a standalone or ‘untethered’ SoC. Cores in the original Rocket chip rely on communicating with a companion processor via the host-target interface (HTIF) to access peripherals and I/O. This release removes this requirement, adding an I/O bus and instantiating FPGA peripherals. The accompanying tutorial, written by Wei Song, describes how to build this code release and explains the underlying structural changes.
The lowRISC blog
Please join us October 9th-11th in Geneva, Switzerland for ORConf 2015. The event is kindly being hosted by CERN at the IdeaSquare. Last year’s ORConf was home to the first public talk on lowRISC and we’re delighted this year it will also be hosting a series of lowRISC and RISC-V discussions, serving as a European lowRISC and RISC-V workshop. ORConf has in recent years grown to cover a range of open source hardware topics beyond the original OpenRISC focus.
It’s the second day of the second RISC-V workshop today in Berkeley, California. I’ll be keeping a semi-live blog of talks and announcements throughout the day. Z-scale. Tiny 32-bit RISC-V Systems: Yunsup Lee Z-Scale is a family of tiny cores, similar in spirit to the ARM Cortex-M family. It integrates with the AHB-Lite interconnect. Contrast to Rocket (in-order cores, 64-bit, 32-bit, dual-issue options), and BOOM (a family of out-of-order cores).
The second RISC-V workshop is going on today and tomorrow in Berkeley, California. I’ll be keeping a semi-live blog of talks and announcements throughout the day. Introductions and welcome: Krste Asanović The beginning of Krste’s talk will be familiar for anyone who’s seen an introduction to RISC-V before. Pleasingly, there are a lot of new faces here at the workshop so the introduction of course makes a lot of sense.
lowRISC was fortunate enough to be chosen as a mentoring organisation in this year’s Google Summer of Code. The Google Summer of Code program funds students to work on open source projects over the summer. We had 52 applications across the range of project ideas we’ve been advertising. As you can see from the range of project ideas, lowRISC is taking part as an umbrella organisation, working with a number of our friends in the wider open source software and hardware community.
We’re pleased to announce the first lowRISC preview release, demonstrating support for tagged memory as described in our memo. Our ambition with lowRISC is to provide an open-source System-on-Chip platform for others to build on, along with low-cost development boards featuring a reference implementation. Although there’s more work to be done on the tagged memory implementation, now seemed a good time to document what we’ve done in order for the wider community to take a look.