SiFive Inc, a California startup working to commercialize an open-source semiconductor technology, said on Tuesday that it has raised an additional million in funding from investors including SK Hynix and Saudi Aramco. The company said its existing investors - including venture capital arms from Intel Corp, Qualcomm Inc and Western Digital Corp - also joined the funding round, bringing its total capital raised since its founding in 2015 to more than 5 million. SiFive is working to sell designs for semiconductors based on the RISC-V architecture, an open-source recipe for making computing chips.