RT-Thread·Qemu-mini2440模拟器使用手册_V1.0

发布于 2010-02-06 10:38:40 浏览：10633 订阅该版

12 个回答

shaolin 2010-02-07

这家伙很懒，什么也没写！

GDB and QEMU on Windows
Tuesday, April 21, 2009

A few weeks ago I started to work on a small operating system for a MIPS-based development motherboard. When thinking about a development toolchain, I immediately looked at one of my favorite emulators – QEMU.

QEMU has a few nice features that make development of operating systems easier than ever. One of these features is the -kernel command line parameter that loads a custom operating system kernel right into memory without the need to write a custom boot loader. Another useful command line option is -s which starts a GDB server inside QEMU so you can connect to it with GDB (with the command target remote :port_number) and debug your loaded kernel with full symbols.

At first, this didn’t work for me. GDB refused to connect to the server for no apparent reason (No connection could be made because the target machine actively refused it.). It took me almost half an hour to figure out where the problem was: QEMU was opening an IPv6-only port and GDB was using IPv4. Quick fix: open up gdbstub.c in QEMU sources, locate the line where the connection string is being created (in QEMU 0.10.2 it’s the line 2300; there is a string that says: tcp::%d,nowait,nodelay,server) and fix the connection string to look like this: tcp::%d,nowait,nodelay,server,ipv4.
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自从更新Qemu版本后，使用Qemu/mini2440的GDB来调试RT-Thread的功能一直没能调通。这可是个头大的问题。
困扰了我N久,然后回溯了QEMU 0.12.2之前的所有版本，跟踪代码也化了整整两天时间,但毫无进展。
今天非常有幸搜索到了这篇文章，原因在于QEMU 0.9.2之后的所有版本GDB Stub仅打开IPV6端口，而GDB工具则使用的是IPV4连接。接着问题就迎刃而解了。
在此做个记录，对发表这篇文章的老兄致谢！
关于如何使用Qemu/mini2440的GDB功能来调试RT-Thread的使用说明会在稍后时间给出。