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Mon, 01 Feb 2021 12:09:22 -0800 (PST) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id n15sm27685167wrx.2.2021.02.01.12.09.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Feb 2021 12:09:21 -0800 (PST) Received: from zen (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id E06AB1FF7E; Mon, 1 Feb 2021 20:09:20 +0000 (GMT) References: <20210128185300.2875-1-alex.bennee@linaro.org> User-agent: mu4e 1.5.7; emacs 28.0.50 From: Alex =?utf-8?Q?Benn=C3=A9e?= To: Peter Maydell Subject: Re: [PATCH] docs/system: document an example vexpress-a15 invocation Date: Mon, 01 Feb 2021 20:08:59 +0000 In-reply-to: Message-ID: <871rdzv9cf.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::42d; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x42d.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=unavailable 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: qemu-arm , Anders Roxell , QEMU Developers Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Peter Maydell writes: > On Thu, 28 Jan 2021 at 18:53, Alex Benn=C3=A9e w= rote: >> >> 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 Benn=C3=A9e >> 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 m= odel: >> ``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=3Darm >> + $ export CROSS_COMPILE=3Darm-linux-gnueabihf- >> + $ make multi_v7_defconfig >> + $ make > > We probably shouldn't be recommending in-tree kernel builds, or > polluting the user's environment with random variables. Try: > > $ make O=3Dbuilddir ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf- multi= _v7_defconfig > $ make O=3Dbuilddir ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf- > >> +By default you will want to boot your rootfs of the sdcard interface. > > "off" > >> +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=3Dvexpress-a15 -serial mon:stdio \ >> + -drive if=3Dsd,driver=3Dfile,filename=3Darmel-rootfs.ext4 \ >> + -kernel zImage \ >> + -dtb vexpress-v2p-ca15-tc1.dtb \ >> + -append "console=3DttyAMA0 root=3D/dev/mmcblk0 ro" > > thanks > -- PMM Booting a Linux kernel ---------------------- Building a current Linux kernel with ``multi_v7_defconfig`` should be enough to get something running. Nowadays an out-of-tree build is recommended (and also useful if you build a lot of different targets). $SRC points at root of the linux source tree. .. code-block:: bash $ mkdir build; cd build $ make O=3D$(pwd) -C $SRC ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf-= multi_v7_defconfig $ make O=3D$(pwd) -C $SRC ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf- By default you will want to boot your rootfs off 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=3Dvexpress-a15 -serial mon:stdio \ -drive if=3Dsd,driver=3Dfile,filename=3Darmel-rootfs.ext4 \ -kernel zImage \ -dtb vexpress-v2p-ca15-tc1.dtb \ -append "console=3DttyAMA0 root=3D/dev/mmcblk0 ro" --=20 Alex Benn=C3=A9e