| Paolo Bonzini | 324b229 | 2020-02-28 15:36:05 +0000 | [diff] [blame] | 1 | .. _direct_005flinux_005fboot: |
| 2 | |
| 3 | Direct Linux Boot |
| 4 | ----------------- |
| 5 | |
| 6 | This section explains how to launch a Linux kernel inside QEMU without |
| 7 | having to make a full bootable image. It is very useful for fast Linux |
| 8 | kernel testing. |
| 9 | |
| 10 | The syntax is: |
| 11 | |
| 12 | .. parsed-literal:: |
| 13 | |
| 14 | |qemu_system| -kernel bzImage -hda rootdisk.img -append "root=/dev/hda" |
| 15 | |
| 16 | Use ``-kernel`` to provide the Linux kernel image and ``-append`` to |
| 17 | give the kernel command line arguments. The ``-initrd`` option can be |
| 18 | used to provide an INITRD image. |
| 19 | |
| 20 | If you do not need graphical output, you can disable it and redirect the |
| 21 | virtual serial port and the QEMU monitor to the console with the |
| 22 | ``-nographic`` option. The typical command line is: |
| 23 | |
| 24 | .. parsed-literal:: |
| 25 | |
| 26 | |qemu_system| -kernel bzImage -hda rootdisk.img \ |
| 27 | -append "root=/dev/hda console=ttyS0" -nographic |
| 28 | |
| 29 | Use Ctrl-a c to switch between the serial console and the monitor (see |
| Peter Maydell | d6359e1 | 2023-05-12 15:43:38 +0100 | [diff] [blame] | 30 | :ref:`GUI_keys`). |
