I have created an image (.img) from my revpi connect+. Now I try to emulate this image with Qemu, but the system won't start.
These are the steps I've done:
1. create .qcow file from image:
"C:\SOFTWARE\qemu\qemu-img" convert -f raw -O qcow2 C:\temp\images\myimage.img qcowfile.qcow
"C:\SOFTWARE\qemu\qemu-img" resize qcowfile.qcow +6G
2. emulate:
"C:\SOFTWARE\qemu\qemu-system-arm" ^
-kernel ./kernels/kernel-qemu-5.4.51-buster ^
-append "root=/dev/mtdblock0 rootfstype=ext4 panic=1" ^
-hda qcowfile.qcow ^
-cpu arm1176 ^
-m 256 ^
-M versatilepb ^
-no-reboot ^
-serial stdio ^
-dtb ./kernels/versatile-pb-buster-5.4.51.dtb ^
-net nic -net user,hostfwd=tcp::10022-:22
the emulation stops with this message:
List of all partitions:
0100 4096 ram0
(driver?)
0101 4096 ram1
(driver?)
0102 4096 ram2
(driver?)
0103 4096 ram3
(driver?)
0104 4096 ram4
(driver?)
0105 4096 ram5
(driver?)
0106 4096 ram6
(driver?)
0107 4096 ram7
(driver?)
0108 4096 ram8
(driver?)
0109 4096 ram9
(driver?)
010a 4096 ram10
(driver?)
010b 4096 ram11
(driver?)
010c 4096 ram12
(driver?)
010d 4096 ram13
(driver?)
010e 4096 ram14
(driver?)
010f 4096 ram15
(driver?)
1f00 65536 mtdblock0
(driver?)
No filesystem could mount root, tried:
ext4
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,0)
CPU: 0 PID: 1 Comm: swapper Tainted: G W 5.4.51 #1
Hardware name: ARM-Versatile (Device Tree Support)
[<c001c84c>] (unwind_backtrace) from [<c0018738>] (show_stack+0x10/0x14)
[<c0018738>] (show_stack) from [<c00252ec>] (panic+0xe4/0x2d8)
[<c00252ec>] (panic) from [<c0a763b0>] (mount_block_root+0x264/0x2b4)
[<c0a763b0>] (mount_block_root) from [<c0a767e0>] (prepare_namespace+0x15c/0x1bc)
[<c0a767e0>] (prepare_namespace) from [<c0609b0c>] (kernel_init+0x8/0xe8)
[<c0609b0c>] (kernel_init) from [<c00090e8>] (ret_from_fork+0x14/0x2c)
Exception stack(0xcf825fb0 to 0xcf825ff8)
5fa0: 00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
Does anyone know what I'm doing wrong?
Emulate image with Qemu
I don't really have experience with qemu as an emulator for Raspberry Pi, but it looks like your (custom) kernel is unable to find the rootfs.
Nicolai
Nicolai
