I program assembly under Linux, compile it and put it in a virtual flash:
dd if=myProgramm.bin of=flash.bin bs=4096 conv=notrunc
dd if=myProgramm.bin of=myProgramm.bin bs=4096 conv=notrunc
Now I load the flash into the qemu emulator:
qemu-system-arm -M connex -pflash flash.bin -nographic -serial /dev/null
Here i can see the registers via
info registers
The problem is, when I now create a new flash, the old flash still is in the qemu emulator until i restart the emulator with
exit
and the Linux command qemu-system
How can I reload the flash without complete restart the whole emulator?
As for my understanding once you flashed the image in qemu you cannot update image.
suppose when you run any system using qemu which contains linux kernel zImage and rootfs with
qemu-system-arm .... args. If u want to reboot it . the qemu quits and once again you have to laod with arguments.
So in qemu as for my knowledge u cannot reload the flash without complete restart the qemu.
Related
I'm running Artix Linux and using Qemu & KVM to emulate Windows 10. I need to enable the support of my microphone and usb webcam. I've tried to first to pass the webcam via Virtmanager, my VM sees the webcam, but I can not get any video feed from. Also I can not get any sound input in my VM. I've tried launching it from the console:
sudo qemu-system-x86_64 -enable-kvm -m 4096 -rtc base=localtime -hda /path/win10.qcow2 -cpu host -device hda-duplex -device usb-host, hostbus=<n>, hostaddr=<m>, id=<id>
But I get this error:
drive with bus=0, unit=0 (index=0) exists
Please, help, I don't know what to do.
I would like to boot a QEMU MIPS architecture machine running some distribution of Linux. I have been looking through this documentation (https://www.linux-mips.org/wiki/QEMU), but I am getting stuck at this part
[ralf#box qemu]$ qemu-system-mips -kernel /tftboot/192.168.0.1/vmlinux.bin -m 16 -nographic
(qemu) mips_r4k_init: start
mips_r4k_init: load BIOS '/usr/local/share/qemu/mips_bios.bin' size 131072
qemu: could not load MIPS bios '/usr/local/share/qemu/mips_bios.bin'
[ralf#box qemu]$
There currently is no MIPS BIOS file for QEMU (see firmware). However if passed a
-kernel argument qemu will not call the firmware at all, so this does no harm at all. Therefore, a command such as
dd if=/dev/zero of=/usr/local/share/qemu/mips_bios.bin bs=1024 count=128
will generate a firmware file that will do the job for now.
I am confused what arguement I am supposed to pass for kernel? Is that /usr/local/share/qemu/mips_bios.bin argument a compiled Linux image?
If possible, I would like the emulator to have a GUI. I am not sure how this is accomplished either.
Thanks.
You no longer need to create a mips_bios.bin file. If you have a file by that name in the same folder when you run qemu-system-mips it will pick it up. I'd remove it if you do. Here's the wiki link for a little history about it:
https://www.linux-mips.org/wiki/QEMU
For a nice example of a mips specific kernel working with graphics and qemu please check this link out:
http://shadow-file.blogspot.com/2013/05/running-debian-mips-linux-in-qemu.html
I tried to create a vm for raspbian in ubuntu. I made a few changes in the raspbian to test if it works in other machines or not. After that i copied the edited image into my computer. Now i try to boot it with qemu but each time qemu opens, i can't see the raspbian. Here is my work
qemu-system-arm -kernel /usr/share/qemu_vms/kernel-qemu -cpu arm1176 -m 256 -M versatilepb -serial stdio -append "root=/dev/sda2 panic=1 rootfstype=ext4 rw" -hda /usr/share/raspi-image.img
So my kernel image is in the /usr/share/qemu_vms and my image is in /usr/share.
I tried to increase the ram amount but in that case even qemu didn't start up. Also i was following this tutorial(which is almost the same with other tutorials and my /etc/ld.so.preload is missing(i can't edit it at all).
I deleted -no-reboot option so it is in a loop for rebooting everytime but it seems that it can't find the image to start.
Any help would be very appreciated.
Sorry to add another thing but i guess i need to edit the question a bit.
All the problem seems to be with the root path. I fixed that problem with adding rootfstype=ext4 rw into the root section.
Now it is entering emergency mode. I tried to change the kernel from wheezy to jessie but it is still the same problem. What is going on?
My aim: Trying to
Build a minimal Qt based GUI system with a single window and sensor connected on USB
demonstrate this using Qemu and later on embedded board with atom
to build it from scratch
Use buildroot to build the rootfilesystem
My experience Have experience in Linux kernel development for device drivers, qemu, Buildroot, USB but has no experience on GUI and framebuffers.
My attempts:Build kernel and rootfile system
with buildroot using the command make qemu_x86_defconfig
Framebuffer support on Linux kernel is enabled along with the following CONFIG_FB, CONFIG_FRAMEBUFFER_CONSOLE, and CONFIG_LOGO (all the options below this are also enabled)
As the first milestone I expected to see the TUX logo when I run the image with the command
qemu-system-i386 -M pc -kernel output/images/bzImage -drive file=output/images/rootfs.ext2 -append root=/dev/sda -vga std but i donot.
Am I making a mistake at the Qemu command or the framebuffer is not enabled?
P.S. A similar question Qt application GUI -- automatic start -- linux. But i am not planning to use the X window as suggested by most users.
I missed the cirrus graphics board driver. Qemu emulates Cirrus CLGD 5446 PCI VGA card or dummy VGA card with Bochs VESA extensions (hardware level, including all non standard modes for i386.
So the steps are:
Download buildroot
make clean
make qemu_x86_defconfig
make linux-menuconfig to configure kernel and in Device drivers->Graphics support->Support for frame buffer devices enable Cirrus Logic support
Save the configuration and run make
Once make is complete run the command in board/qemu/x86/readme.txt
Where did you see that Buildroot has a i386_defconfig? You seem to be confusing kernel defconfigs and Buildroot defconfigs. I would recommend you to start with:
make clean
make qemu_x86_defconfig
make
and then read board/qemu/x86/readme.txt to see how to run the generated system.
I want to emulate the friendlyARM board, the Mini2440 or the mini6410, so I can get to practice the embedded programming, the QT programming and this due to some financial difficulties and strange import policy in my country.
Anyway, the problem is that I can't seem to understand what's the first step to proceed the emulation: Am running ubuntu 12.04 on VirtualBox then, I installed the qemu-kvn-extras then what ?
Do I need a new kernel for qemu and the emulation process ? What's its specifications ?
In the other hand, when I read all of the tutorials in the net, I can't see the hardware specification part : I mean where is the part in the "qemu-i386 command" that refers to the fact that I'm using Mini2440 ?
After a long period of research, I don't know whether I can emulate the board so I can get used to the u-boot and cross compiling, etc.. or it's just a dream I can't reach ..
(Sorry for reviving an old thread but I had similar issues, so this might be useful for some other people, too)
To run my tests I used (see also man qemu-system-arm):
$ qemu-system-arm -machine versatilepb -cpu arm1176 -m 128M -nographic -kernel kernel.img
You might not want the -nographic here when you are testing Qt and need to replace kernel.img with the image you want to run. However, note that you need the ARM version of qemu qemu-system-arm. It will not work with the Intel version qemu-i386 as the mini6410 runs an ARM processor (the ARM1176JZF-S).
For me, connecting with gdb was also useful (-S halts the CPU at start, -s starts a gdbserver on port 1234):
$ qemu-system-arm -machine versatilepb -cpu arm1176 -S -s -m 128M -nographic -kernel kernel.img
And then:
$ arm-none-eabi-gdb
(gdb) target remote localhost:1234
By the way, host system can be any Linux distribution, so you do not need VirtualBox if your host is already Linux.
Another remark: I am currently struggling to get the interrupts to run on qemu (see also ARM Interrupt Handling in QEMU), so not sure if everything will work for you though.
Good luck! ;)
The closest thing I know about emulating the Mini2440 is that it's emulated on MAME.
The only problem is that you're not only stuck with the 3 pre installed OSes (Windows Mobile, old version Android and a Linux distro) but it's also slow and you can't connect to anything outside of the device itself.
You'll probably need a beefy computer if you want to run this, the beefier the PC is, the faster you can run it.
Plus, you can't use your mouse as a touch screen. You'll need to map out the touch screen controls that are already present in MAME if you want something like that.