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Thu, 28 Jan 2021 10:53:08 -0800 (PST) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id v6sm8019721wrx.32.2021.01.28.10.53.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jan 2021 10:53:07 -0800 (PST) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id BE9FD1FF7E; Thu, 28 Jan 2021 18:53:06 +0000 (GMT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Subject: [PATCH] docs/system: document an example vexpress-a15 invocation Date: Thu, 28 Jan 2021 18:53:00 +0000 Message-Id: <20210128185300.2875-1-alex.bennee@linaro.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::434; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x434.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anders Roxell , qemu-arm@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Peter Maydell Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The wiki and the web are curiously absent of the right runes to boot a vexpress model so I had to work from first principles to work it out. Use the more modern -drive notation so alternative backends can be used (unlike the hardwired -sd mode). Signed-off-by: Alex Bennée Cc: Anders Roxell --- docs/system/arm/vexpress.rst | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/docs/system/arm/vexpress.rst b/docs/system/arm/vexpress.rst index 7f1bcbef07..30b1823b95 100644 --- a/docs/system/arm/vexpress.rst +++ b/docs/system/arm/vexpress.rst @@ -58,3 +58,29 @@ Other differences between the hardware and the QEMU model: ``vexpress-a15``, and have IRQs from 40 upwards. If a dtb is provided on the command line then QEMU will edit it to include suitable entries describing these transports for the guest. + +Booting a Linux kernel +---------------------- + +Building a current Linux kernel with ``multi_v7_defconfig`` should be +enough to get something running. + +.. code-block:: bash + + $ export ARCH=arm + $ export CROSS_COMPILE=arm-linux-gnueabihf- + $ make multi_v7_defconfig + $ make + +By default you will want to boot your rootfs of the sdcard interface. +Your rootfs will need to be padded to the right size. With a suitable +DTB you could also add devices to the virtio-mmio bus. + +.. code-block:: bash + + $ qemu-system-arm -cpu cortex-a15 -smp 4 -m 4096 \ + -machine type=vexpress-a15 -serial mon:stdio \ + -drive if=sd,driver=file,filename=armel-rootfs.ext4 \ + -kernel zImage \ + -dtb vexpress-v2p-ca15-tc1.dtb \ + -append "console=ttyAMA0 root=/dev/mmcblk0 ro" -- 2.20.1