SiFive is the most high profile of the independent chip designers that are basing their fortunes on the open source RISC-V architecture and last month, the company raised $175m in a Series F funding round led by Coatue Management, bringing its total to date to $350m. The company qualifies as a ‘double unicorn’, with a valuation of over $2.5bn. SiFive may command headlines and investors, but the RISC-V International industry alliance now has more than 200 semiconductor firms, software developers and academic institutions among its supporters, even including Intel. Intel has been linked to acquisition designs on SiFive, but so far has just announced RISC-V activities for its fledgling foundry business. It says it will work with RISC-V International –…