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Fri, 07 Dec 2018 10:30:33 -0800 (PST) Date: Fri, 07 Dec 2018 10:30:33 -0800 (PST) X-Google-Original-Date: Fri, 07 Dec 2018 10:30:08 PST (-0800) Subject: Re: [PATCH 0/3] RISC-V SBI earlycon In-Reply-To: <20181204135507.3706-1-anup@brainfault.org> From: Palmer Dabbelt To: anup@brainfault.org, Greg KH Message-ID: Mime-Version: 1.0 (MHng) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181207_103045_890692_3AD8DBBF X-CRM114-Status: GOOD ( 15.08 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robh@kernel.org, aou@eecs.berkeley.edu, anup@brainfault.org, linux-kernel@vger.kernel.org, Christoph Hellwig , atish.patra@wdc.com, linux-serial@vger.kernel.org, jslaby@suse.com, linux-riscv@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org On Tue, 04 Dec 2018 05:55:04 PST (-0800), anup@brainfault.org wrote: > This patchset adds RISC-V SBI earlycon and removes RISC-V EARLY_PRINTK. > > We should use earlycon over existing EARLY_PRINTK for SBI console because: > 1. It's a more generic way of implementing early console for debugging > 2. Current RISC-V EARLY_PRINTK is a compile-time option whereas earlycon > is enabled at run-time via kernel parameters. > 3. To use earlycon with SBI, we have to pass "earlycon=sbi" in kernel > parameters. If earlycon kernel parameter is not provided then kernel > boots much faster which is very useful in real-world RISC-V deployments. > > The patchset is tested on QEMU virt machine. It is based on Linux-4.20-rc5 > and can be found at riscv_earlycon_v1 branch of: > https://github.com/avpatel/linux.git > > Anup Patel (3): > tty/serial: Add RISC-V SBI earlycon support > RISC-V: defconfig: Enable RISC-V SBI earlycon support > RISC-V: Remove EARLY_PRINTK support > > arch/riscv/Kconfig.debug | 2 -- > arch/riscv/configs/defconfig | 1 + > arch/riscv/kernel/setup.c | 28 ------------------------- > drivers/tty/serial/Kconfig | 12 +++++++++++ > drivers/tty/serial/Makefile | 1 + > drivers/tty/serial/earlycon-riscv-sbi.c | 28 +++++++++++++++++++++++++ > 6 files changed, 42 insertions(+), 30 deletions(-) > create mode 100644 drivers/tty/serial/earlycon-riscv-sbi.c I'm adding these to my for-next. Thanks! _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv