* arch: fe310: Fix comments * arch: fe310: Improve irq handling in fe310_serial.c * arch: fe310: Fix initial interrupt status (mstatus) Also, removed unnecessary up_enable_irq(FE310_IRQ_ECALLM)
fe310 with pll * arch: fe310: Introduce CONFIG_ARCH_CHIP_FE310_QEMU * boards: hifive1-revb: Introduce CONFIG_ARCH_CHIP_FE310_QEMU * arch: fe310: Add support for PLL * boards: hifive1-revb: Increase uart0 tx buff size and add getprime app Approved-by: Gregory Nutt <gnutt@nuttx.org>