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Date:   Thu, 18 Apr 2019 16:22:32 -0700
From:   Kevin Hilman <>
To:     Paul Walmsley <>,,,,
Cc:     Paul Walmsley <>
Subject: Re: [PATCH v5 0/2]  tty: serial: add DT bindings and serial driver for the SiFive FU540 UART

Hi Paul,

Paul Walmsley <> 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 <>.
> The patches in this series can also be found, with the PRCI patches,
> DT patches, and DT prerequisite patch, at:

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

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].








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