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[73.95.159.87]) by smtp.gmail.com with ESMTPSA id u124sm2253532ioe.63.2019.10.09.12.53.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Oct 2019 12:53:51 -0700 (PDT) Date: Wed, 9 Oct 2019 12:53:50 -0700 (PDT) From: Paul Walmsley X-X-Sender: paulw@viisi.sifive.com To: Jonathan Corbet Subject: [PATCH] Documentation: admin-guide: add earlycon documentation for RISC-V Message-ID: User-Agent: Alpine 2.21.9999 (DEB 301 2018-08-15) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191009_125352_749261_6632B0C1 X-CRM114-Status: UNSURE ( 8.74 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-doc@vger.kernel.org, Andreas Schwab , linux-kernel@vger.kernel.org, Geert Uytterhoeven , linux-riscv@lists.infradead.org, Christoph Hellwig Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org Kernels booting on RISC-V can specify "earlycon" with no options on the Linux command line, and the generic DT earlycon support will query the "chosen/stdout-path" property (if present) to determine which early console device to use. Document this appropriately in the admin-guide. Signed-off-by: Paul Walmsley Cc: Geert Uytterhoeven Cc: Christoph Hellwig Cc: Andreas Schwab --- Documentation/admin-guide/kernel-parameters.txt | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index c7ac2f3ac99f..011fee969ece 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -990,6 +990,10 @@ [X86] When used with no options the early console is determined by the ACPI SPCR table. + [RISCV] When used with no options, the early + console is determined by the stdout-path + property in the device tree's chosen node. + cdns,[,options] Start an early, polled-mode console on a Cadence (xuartps) serial port at the specified address. Only -- 2.23.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv