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C1-Ultra FVP调试并运行Linux kernel全程记录,硬核演示如何解决启动问题

  • 2026-06-30 13:15:20
C1-Ultra FVP调试并运行Linux kernel全程记录,硬核演示如何解决启动问题

最近使用C1-Ultra FVP来研究Linux kernel时遇到了不少问题,不过借助于强大的ARM Development Studio逐一解决了所有问题,为后续源码级研究kernel搭建了一个完美的环境,本文记录了我在解决这些问题的所有步骤,非常具有指导作用!

使用boot-wrapper-aarch64作为bootloader

为什么使用boot-wrapper-aarch64,因为我这里只关注Linux内核,所以没必要跑完整的软件栈,使用boot-wrapper-aarch64启动Linux比较快捷,且boot-wrapper-aarch64简单易懂,对于理解arm64 Linux启动流程已经足够了。

编译内核

如果你是windows环境,编译内核需要Linux环境,可以使用虚拟机或者wsl2,我这里使用的是wsl2 注意,后面下载内核,编译代码都在Linux环境上进行的

下载内核

这里使用的内核版本为6.19.3,也是我当时研究时的最新版本,不过此时已经不是最新版本了,理论上你使用当前最新版本也没啥问题

使用国内镜像源下载linux-6.19.3:

wget https://mirrors.ustc.edu.cn/kernel.org/linux/kernel/v6.x/linux-6.19.3.tar.xz

配置及编译内核

tar xf linux-6.19.3.tar.xz cd linux-6.19.3 make ARCH=arm64 CROSS_COMPILE=aarch64-none-linux-gnu- defconfig make ARCH=arm64 CROSS_COMPILE=aarch64-none-linux-gnu- menuconfig

Kernel hacking

[*] Kernel debugging

[*]   Miscellaneous debug code

  Compile-time checks and compiler options  --->

        Debug information (Rely on the toolchain's implicit default DWARF version)  --->

    [ ] Reduce debugging information //这个不要勾选

make ARCH=arm64 CROSS_COMPILE=aarch64-none-linux-gnu- -j12

编译rootfs

wget https://buildroot.org/downloads/buildroot-2025.11.2.tar.xz
tar xf buildroot-2025.11.2.tar.xz
cd buildroot-2025.11.2
make menuconfig //进行arm64架构,编译器等的配置
make

不过需要注意的就是编译过程中会下载一些包,可能较慢,可以使用我提供的编译过的源码包,省去下载步骤

这里补充一下配置内容:

目标架构:

外部编译器:

文件系统格式:

基本上配置这些内容就够了,编译完成,一个简单的rootfs就制作好了,在buildroot-2025.11.2/output/images路径下

编译boot-wrapper-aarch64

clone boot-wrapper-aarch64代码:

git clone git://git.kernel.org/pub/scm/linux/kernel/git/mark/boot-wrapper-aarch64.git
cd boot-wrapper-aarch64
cat README
Linux boot wrapper with FDT support
===================================

To get started:

$ autoreconf -i
$ ./configure --host=<toolchain-triplet> --with-kernel-dir=<kernel-dir> <other-options>
$ make

Where:
 - <toolchain-triplet>: this is something like aarch64-linux-gnu
 - <kernel-dir>: the directory containing a pre-built aarch64 kernel
   and its sources.
 - <other-options>: see ./configure -h for a list of other options.

配置及编译

更多configure参数,可以使用如下命令查看:

configure -h

完整的配置及编译命令如下:注意下面configure命令的参数,内核和dtb路径改成你自己的

autoreconf -i
./configure --host=aarch64-none-linux-gnu --enable-psci --enable-gicv3 --with-kernel-dir=/home/coolloser/arm64_linux/linux-6.19.3 --with-dtb=/home/coolloser/arm64_linux/linux-6.19.3/arch/arm64/boot/dts/arm/foundation-v8-gicv3-psci.dtb --with-initrd=/home/coolloser/arm64_linux/buildroot-2025.11.2/output/images/rootfs.cpio --with-cmdline="rdinit=/linuxrc console=ttyAMA0"
make -j12

设置ADS

导入源码

打开ads 2025.1后,先导入源码,由于我使用的是wsl2,所以先将wsl2映射到本地的一个盘符,如下图所示,在文件资源管理器中,右键wsl2的目录,选择映射网络驱动器:

点击完成即可:

现在可以在ads中导入源码了,点击File->Import:

选择General->Projects from Folder or Archive,然后next

之后将Search for nested projects取消勾选,因为我们要导入Linux源码,这里不取消勾选,待会check的会很慢,然后点击Directory:

选择我们存放boot-wrapper-aarch64和linux-6.19.3的目录:

点击finish即可,导入之后如下:

创建debug launch

右键导入的工程,选择Debug As->Debug Configurations

右键Generic Arm C/C++ Application,选择New Configuration

选择C1 Ultra x4 FVP,注意在Arm FVP(Installed with Arm DS)中选择,名字随便起一个:

然后点击Files,在Application on host to download下点击Workspace,选择boot-wrapper-aarch64/linux-system.axf

点击Debugger,选择Debug from entry point

在Source search directory中点击Workspace,添加boot-wrapper-aarch64和linux-6.19.3路径

设置完成之后,点击Debug,这时候FVP就启动了,并且调试器连接FVP,下载程序,加载符号表等,一气呵成:

完成后的界面是这样的:

运行boot-wrapper-aarch64和Linux(解决无法启动问题)

运行之前需要开启Telnet:

经过以上准备工作,现在可以运行boot-wrapper-aarch64和Linux了 提前剧透一下,运行起来可没那么一帆风顺,不过我就喜欢遇到问题^_^

问题一

点击运行按钮即可运行程序 很不幸,第一步就没运行起来,幸运的是,给出了解决的提示,即需要给FVP添加bp.secure_memory=false参数,以解决TZC-400对DRAM的控制

现在我们根据提示给FVP添加bp.secure_memory=false参数: 先断开连接 然后右键这个launch,或者右键工程,选择Debug As->Debug Configurations,就跟我们创建这个launch时一样:

在Connection下,Model parametes中填入-C bp.secure_memory=false,然后点击Debug

现在又启动了,点击运行按钮,这下终于有log了:

问题二

不过,等等,为啥卡在这里了?这就需要我们进行调试了,看看卡在哪里了,为什么卡住了 经过我的一番debug,发现除了主cpu的id匹配上了,其他cpu的id未能匹配,所以其他cpu直接结束运行,改动很简单,修改内核中的设备树:

改完之后,重新编译设备树和boot-wrapper-aarch64,再次运行:

这次可以看到已经进入kernel了,但是kernel并没有运行起来,看来卡在kernel启动阶段了,至少boot-wrapper-aarch64已经运行完了

问题三

下面我们继续debug kernel,看看卡在哪里了,以及为什么卡住了 经过我的一番debug,终于找到原因了,是因为kernel运行在EL2N(因为VHE),访问mpam寄存器时,trap到EL3了,解决起来也挺简单,在boot-wrapper-aarch64中添加几行代码将mpam使能,让低异常级别可以访问mpam相关的系统寄存器,就可以了:

问题

再次运行,终于看到kernel的log了

可惜又卡死了,分析下来,发现调度器没运行起来,使用时间生成随机数时失败,且log前面的时间全是0,才明白过来 执行FVP_Base_C1-Ultra.exe --list-param命令,可以看到如下内容

bp.refcounter.non_arch_start_at_default默认是0,本身是需要firmware来使能的,也可以在fvp的参数中使能,我们在fvp的参数中添加-C bp.refcounter.non_arch_start_at_default=1 再次运行,终于运行起来了:

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  1. CONNECT:[ UseTime:0.000897s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000861s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000335s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000257s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000511s ]
  8. SELECT * FROM `article` WHERE `id` = 496491 LIMIT 1 [ RunTime:0.000442s ]
  9. UPDATE `article` SET `lasttime` = 1783058447 WHERE `id` = 496491 [ RunTime:0.028063s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000418s ]
  11. SELECT * FROM `article` WHERE `id` < 496491 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000556s ]
  12. SELECT * FROM `article` WHERE `id` > 496491 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000378s ]
  13. SELECT * FROM `article` WHERE `id` < 496491 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001134s ]
  14. SELECT * FROM `article` WHERE `id` < 496491 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000880s ]
  15. SELECT * FROM `article` WHERE `id` < 496491 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004381s ]
0.202741s