Hi Paul, Paul Walmsley <paul.walmsley@xxxxxxxxxx> writes: > This series adds a serial driver, with console support, for the > UART IP block present on the SiFive FU540 SoC. The programming > model is straightforward, but unique. > > Boot-tested on a SiFive FU540 HiFive-U board, using BBL and the > open-source FSBL (with appropriate patches to the DT data). > > This fifth version fixes a bug in the set_termios handler, > found by Andreas Schwab <schwab@xxxxxxx>. > > The patches in this series can also be found, with the PRCI patches, > DT patches, and DT prerequisite patch, at: > > https://github.com/sifive/riscv-linux/tree/dev/paulw/serial-v5.1-rc4 I tried this branch, and it doesn't boot on my unleashed board. Here's the boot log when I pass the DT built from your branch via u-boot: https://termbin.com/rfp3. I also tried the same thing, but using the DT that's hard-coded into SBI/u-boot. That doesn't boot fully either[1], but one thing I noted is that with the DT from the kernel tree, the printk timestamps aren't moving. Maybe I'm still missing some kconfig options to enable the right clock and/or IRQ controllers? I'm using this fragment[2] on top of the default defconfig (arch/riscv/configs/defconfig). Could you share the defconfig you're using when testing your branch? Also for reference, I'm able to successfully build/boot the 5.1-rc1-unleashed branch from Atish's tree[3] using that kconfig fragment[2] (and the hard-coded DT from u-boot/SBI). Full log here[4]. Thanks, Kevin [1] https://termbin.com/wuc9 [2] CONFIG_CLK_SIFIVE=y CONFIG_CLK_SIFIVE_FU540_PRCI=y CONFIG_SERIAL_SIFIVE=y CONFIG_SERIAL_SIFIVE_CONSOLE=y CONFIG_SIFIVE_PLIC=y CONFIG_SPI=y CONFIG_SPI_SIFIVE=y CONFIG_GPIOLIB=y CONFIG_GPIO_SIFIVE=y CONFIG_PWM_SIFIVE=y CONFIG_CLK_U54_PRCI=y CONFIG_CLK_GEMGXL_MGMT=y [3] https://github.com/atishp04/linux/tree/5.1-rc1-unleashed [4] https://termbin.com/12bg
