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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 | |
30 | :ref:`pcsys_005fkeys`). |