PWM

• http://bugs.libre-riscv.org/show_bug.cgi?id=13
• https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/ includes GPIO, SPI, UART, JTAG, I2C, PinCtrl, UART and PWM. Also included is a Watchdog Timer and others.
• https://opencores.org/project,ss_pcm
• also standard part of Litex