Gem5 ARM FS -内核恐慌-不是同步: VFS:无法在未知块上挂载根fs (8，1)

Question

我试图在Gem5中运行我的第一次全系统仿真，但是我得到了以下错误

[    5.703750] VFS: Cannot open root device "sda1" or unknown-block(8,1): error -6
[    5.704398] Please append a correct "root=" boot option; here are the available partitions:
[    5.706209] 0800             252 sda 
[    5.706370]  driver: sd
[    5.707223] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)
[    5.708000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.18.0+ #1
[    5.708570] Hardware name: V2P-CA15 (DT)
[    5.709020] Call trace:
[    5.709601]  dump_backtrace+0x0/0x1c0
[    5.710230]  show_stack+0x14/0x20
[    5.710844]  dump_stack+0x8c/0xac
[    5.711375]  panic+0x130/0x288
[    5.711980]  mount_block_root+0x1a8/0x294
[    5.712617]  mount_root+0x140/0x174
[    5.713243]  prepare_namespace+0x138/0x180
[    5.713891]  kernel_init_freeable+0x1c0/0x1e0
[    5.714489]  kernel_init+0x10/0x108
[    5.715069]  ret_from_fork+0x10/0x18
[    5.715584] Kernel Offset: disabled
[    5.716051] CPU features: 0x21c0649a
[    5.716509] Memory Limit: 512 MB
[    5.717254] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1) ]---

gem5命令的输出是

warn: Tried to write RVIO at offset 0xa8 (data 0) that doesn't exist
warn: Tried to read RealView I/O at offset 0x8 that doesn't exist
warn: Tried to read RealView I/O at offset 0x48 that doesn't exist
warn: EnergyCtrl: Disabled handler, ignoring read from reg 0
info: Dumping kernel dmesg buffer to system.workload.dmesg...
warn: Kernel panic in simulated kernel

我在用

• Gem5 20.1.0.2 (稳定分支)
• cmd：./build/ARM/gem5.opt configs/example/fs.py --cpu-type=TimingSimpleCPU --cpu-clock=1GHz --kernel=binaries/vmlinux.arm64 --disk-image=disks/m5_exit.squashfs.arm64 --bootloader=binaries/boot.arm64

内核和磁盘映像取自gem5来宾二进制页面，我选择了第一个链接(最新的Linux / Bootloader)

我注意到了这问题，但错误略有不同，运行的命令行、内核、映像也不同。

我怎样才能解决这个问题？

Answer 1

这个答案针对您提到的问题指向：https://askubuntu.com/questions/41930/kernel-panic-not-syncing-vfs-unable-to-mount-root-fs-on-unknown-block0-0/1048477#1048477，其中包含对此错误的详细诊断过程。

对于这一点，并且从内核消息中，我们清楚地看到root=内核CLI参数是不正确的:默认的sda1被使用而不是必需的sda。

在fs.py上，可以用以下方式设置正确的root=：

--command-line 'earlyprintk=pl011,0x1c090000 lpj=19988480 rw loglevel=8 mem=256MB root=/dev/sda console_msg_format=syslog nokaslr norandmaps panic=-1 printk.devkmsg=on printk.time=y rw console=ttyAMA0 - lkmc_home=/lkmc'

我认为没有一种方法可以在root=中设置fs.py，所以所有其他选项都是从默认的fs.py内核CLI中复制的，只有--root被修改了。这也可以是在这里被看到。