将Qemu控制台重定向到文件或主机终端? [英] Redirect Qemu console to a file or the host terminal?

问题描述

我的系统是基于x86的内核，并且是 ramfs 的根文件系统.我已经基于cpio归档文件制作了基于ramfs的文件(它将使用boot =/dev/ram0作为RAM设备)，并且在初始化方面遇到了一些问题.整个目的是将ramfs优化到最小，以适合非常小的系统.我正在尝试在init中调试问题.我在 QEMU /List_of_Ubuntu_releases#Ubuntu_12.10_.28Quantal_Quetzal.29"rel =" nofollow noreferrer> Ubuntu 12.10 (量化格查尔)，使用命令:

My system is an x86-based kernel and ramfs-based root filesystem. I have made the ramfs-based on the cpio archive (which will use boot=/dev/ram0 as the RAM device), and I am having some issues with the init. The whole intention is to optimise the ramfs to the minimum to fit in a really small system. I am trying to debug the problem in the init. I start QEMU in Ubuntu 12.10 (Quantal Quetzal) using the command:

qemu-system-x86_64 -kernel linux-3.9.2/arch/x86/boot/bzImage -serial stdio \
    -append "root=/dev/ram0 console=tty1"

按照预期，系统将转到OOPS.

And as expected the system goes to OOPS.

我想查看日志以调查崩溃的原因，但是我无法使用 Shift 键和 Page Up / Page Down .因此，我尝试通过以下命令使用curses将输出重定向到主机终端:

I would like to see the logs to investigate the reason for the crash, but I cannot navigate in the QEMU console using the Shift key and Page Up/Page Down. So I tried redirecting the output to the host terminal using curses by the command:

qemu-system-x86_64 -kernel linux-3.9.2/arch/x86/boot/bzImage -serial stdio \
    -append "root=/dev/ram0 console=tty1" -curses

但是在这里我无法导航并找到问题.

But here again I am unable to navigate and find the problem.

P.S.如果我的系统正常运行(使用正确的rootfs)，则可以导航并查看消息.

P.S. If my system boots fine (using the correct rootfs) then I am able to navigate and see the messages.

如何将消息重定向到终端或文件?

How do I redirect the messages to the terminal or to a file?

推荐答案

添加以下命令: console = ttyAMA0 console = ttyS0

qemu-system-x86_64 -kernel linux-3.9.2/arch/x86/boot/bzImage -serial stdio \
    -append "root=/dev/ram0 console=ttyAMA0 console=ttyS0"

现在，所有dmesg日志都将重定向到您的控制台.

Now all dmesg logs will be redirected to your console.

另一件事:从上述命令中我观察到，您的初始RAM磁盘在哪里?即- -initrd(ini​​trdimage)

One more thing: I observed from above command, where is your initial RAM disk? i.e - -initrd (initrdimage)

要启动系统，您需要两个映像，1)zImage或bZimage(对于x86)2)rootfs-根文件系统

To boot the system you need two images, 1) zImage or bZimage (in case of x86) 2) rootfs -root file system

在您的情况下，缺少的组件是rootfs.

The missing component is rootfs in your case.

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