- Qemu system arm no output manual#
- Qemu system arm no output archive#
- Qemu system arm no output software#
When I use incorrect filename in rdinit, I get same error as Vinicius do Vale: My rootfs is surely ok, test is build using same toolchain as kernel (GNU/Linux toolchain from CodeSourcery). “Kernel panic – not syncing: Attempted to kill init!” I’ve followed all steps, I even downloaded the same linux kernel sources and toolchain, but still not able to run ARM kernel in QEMU. The next step would be to create a working filesystem with a command shell and at least basic functionality. The QEMU window will show the boot messages we saw before, but at the end of the execution a “Hello World!” will be displayed. QEMU can pass the filesystem binary image to the kernel using the initrd parameter the kernel must also know that the root filesystem will be located in RAM (because that’s where QEMU writes the initrd binary) and that the program to launch is our test executable, so the command line becomes: qemu-system-arm -M versatilepb -m 128M -kernel zImage -initrd rootfs -append "root=/dev/ram rdinit=/test" The rootfs file in our case is a binary image of a filesystem containing a single file, that is the test ELF program.
Qemu system arm no output archive#
The cpio tool takes a list of files and outputs an archive the newc format is the format of the initramfs filesystem, that the Linux kernel recognizes. We can now create a simple filesystem using the cpio tool as follows: echo test | cpio -o -format=newc > rootfs This creates an executable ELF program for ARM, statically linked (all the libraries that it needs are linked together in a single binary). Having the GNU/Linux ARM toolchain installed (be aware that it is different from the bare EABI toolchain) I ran: arm-none-linux-gnueabi-gcc -static test.c -o test Note: an infinite loop is introduced because when Linux executes the first program in the root filesystem, it expects that the program does not exit. Let’s then create the simplest filesystem we can do: it consists of a single “Hello World” executable, that can be built using the CodeSourcery GNU/Linux toolchain. QEMU will execute the Linux image: the kernel will display many boot messages and then it will complain that it didn’t find a root filesystem. This image can be run in QEMU using the following command (assuming that you are in the “ arch/arm/boot” directory): qemu-system-arm -M versatilepb -m 128M -kernel zImage This will start the building of the kernel using the correct ARM compiler the build will create, among other binaries, a compressed kernel in a file called zImage located in “ arch/arm/boot“. If using the GNU/Linux toolchain, the command that must be used is, instead: make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- all I exited the menu and saved the configuration, then I ran: make ARCH=arm CROSS_COMPILE=arm-none-eabi- all
Qemu system arm no output software#
This is necessary to run software compiled with the CodeSourcery toolchain. I removed module support (for simplicity) and enabled EABI support as a binary format (allowing also old ABI). I wanted to tweak it a little bit, so I ran: make ARCH=arm menuconfig This command sets a predefined configuration, used in compilation, that is capable of building a kernel targeted to run inside the VersatilePB board. From that folder I ran: make ARCH=arm versatile_defconfig The vanilla kernel can be downloaded from I took the latest at the moment ( version 2.6.33) and extracted it in a folder.
Qemu system arm no output manual#
From version 2010q1 of the toolchain, the manual explicitly says that the compiler is not intended for Linux kernel development it is anyway possible to use the GNU/Linux toolchain for the same scope. The toolchain I’ll be using is the CodeSourcery ARM EABI toolchain. I don’t have a physical ARM device handy, so I’m using QEMU instead, as I’ve already done before.īoth the mainline kernel and QEMU support the VersatilePB platform, so that’s the target I chose for my tests. Last time I experimented on compiling bare-metal ARM programs and U-Boot now I want to compile a Linux kernel for an ARM architecture from scratch. I have written a new updated version of this post here.
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