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Mon, 01 Feb 2021 15:51:51 -0800 (PST) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id v4sm32886653wrw.42.2021.02.01.15.51.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Feb 2021 15:51:50 -0800 (PST) Received: from zen (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id E38941FF7E; Mon, 1 Feb 2021 23:51:49 +0000 (GMT) References: <20210128185300.2875-1-alex.bennee@linaro.org> <871rdzv9cf.fsf@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 23:50:04 +0000 In-reply-to: Message-ID: <87y2g7tkh6.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::336; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x336.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 Mon, 1 Feb 2021 at 20:09, Alex Benn=C3=A9e wr= ote: >> >> >> Peter Maydell writes: >> >> > On Thu, 28 Jan 2021 at 18:53, Alex Benn=C3=A9e wrote: >> >> >> >> 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 QEM= U 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=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- mu= lti_v7_defconfig >> > $ make O=3Dbuilddir ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf- > >> 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-gnueabi= hf- multi_v7_defconfig >> $ make O=3D$(pwd) -C $SRC ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabi= hf- > > That works, but do you really commonly cd into the build directory? > I usually sit in the source tree... I have tmux panes, lots of lots of tmux panes. It's more common to live in the build directories for QEMU because I have to run the binaries I build. For the kernels I usually have one pane in the tip of source tree and a bunch of others for build configurations I'm actively messing about with and rebuilding. > > thanks > -- PMM --=20 Alex Benn=C3=A9e