Good day,
So I am following this coreboot v3 + OpenBIOS tutorial Here .
In the instructions I have the following...
mkdir foo
cd foo
wget http://www.coreboot.org/images/9/9d/Qemu_coreboot_openbios.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_openbios.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_openbios.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio
I noticed that qemu has been replace or is implemented with qemu-system.
command I am running
qemu-x86_64 -L foo -hda /dev/zero -serial stdio
When I run the command, I see just qemu run it's typical and not find a disk.(which I expect since the disk switch points to /dev/zero) but none of the payloads run as I would expect from the tutorial.
What am I doing incorrectly?
Should I use a different version of qemu?
Should I create a dummy disk for this?
Qemu seems to be ignoring the files in the foo directory.
The examples are not up to date, as you have noticed by the renaming of qemu to qemu-system-x86_64.
I managed to get the examples to work using only the cirrus video card, and by renaming the outputs of the zips (bin - bios files to bios-256k.bin). I did this because by adding the -L option I specify the bios location and qemu will look for a file called bios-256k.bin as the bios. The command to run the bios with cirrus (all done while in the foo directory) was
qemu-system-x86_64 -L . -vga cirrus -serial stdio
Both machine types pc and q35 worked.
Related
I am using qemu-system-riscv6 to test and develop on top of XV6-riscv toy OS.
I am looking for a way to run the XV6-riscv OS with command line input from the host OS.
For example, I have a function called my_function. I want to type something like:
make qemu --input "my_function"
And that it will result in:
qemu-system-riscv64 -machine virt -bios none -kernel kernel/kernel -m 128M -smp 3 -nographic -drive file=fs.img,if=none,format=raw,id=x0 -device virtio-blk-device,drive=x0,bus=virtio-mmio-bus.0
xv6 kernel is booting
hart 2 starting
hart 1 starting
init: starting sh
$ my_function
I have searched qemu-system-riscv6 documentation and couldn't find anything. Qemu is far too versatile, and I couldn't find anything on the qemu documentation as well, this seems to complicated to embed inside the XV6 framework.
Is there any known method to accomplish what I need?
I am trying to run qemu with code that my teacher provided so that we are able to work on our assignment.
This is being run in Ubuntu 18.04
LIBPATH=/usr/lib/gcc/arm-none-eabi/6.3.1/
arm-none-eabi-as -mcpu=arm926ej-s -g ts.s -o ts.o
arm-none-eabi-gcc -c -mcpu=arm926ej-s -g t.c -o t.o
arm-none-eabi-ld -T t.ld ts.o t.o -o t.elf
arm-none-eabi-ld -T t.ld -L $LIBPATH ts.o t.o -o t.elf -lgcc #-lstr
arm-none-eabi-objcopy -O binary t.elf t.bin
rm *.o *.elf
echo ready to go?
read dummy
qemu-system-arm -M realview-pbx-a9 -m 128M -kernel t.bin \
-serial mon:stdio -serial /dev/pts/2 -serial /dev/pts/2 -serial /dev/pts/2
And the numbers in the last line `-serial /dev/pts/#' are from running ps in the terminal and grabbing the number. All of this is in an executable file, and when I run the file the qemu screen does display, but when I press enter again I recieve this error message
unknown keycodes `(unnamed)', please report to qemu-devel#nongnu.org
I cannot seem to find any clear answer on how to solve this problem. I have tried uninstalling and reinstalling qemu a couple of time.
QEMU's "unknown keycodes" message is about key handling in its graphics window, and means that the host keyboard mapping you're using has some odd setup that it doesn't entirely understand. Usually this means that a few keys won't work right in the graphics window, and you can ignore it unless you're actually having a problem with them. The whole keycode system was completely rewritten in a newer version of QEMU, and this message doesn't even exist any more.
If your test program isn't expecting to use the graphical screen, then you can definitely ignore the message (indeed you could turn off the graphics screen entirely with -display none).
The command line options to QEMU you're using for the serial port look really odd -- you seem to be trying to connect multiple serial ports to the same host tty, which I'm pretty sure won't work right. Unless you're actually using serial ports 1 through 3, just drop those and use the serial port 0 that is set up with "-serial mon:stdio".
I have Arch Linux on /dev/sdb1 and NetBSD-7.0 on /dev/sdb2.
On Arch Linux when I run sudo grub-mkconfig -o /boot/grub/grub.cfg I get a message like Found unknown Linux distribution on /dev/sdb2 but when I reboot, there is no grub option for that unknown Linux distribution which I know it is NetBSD-7.0.
How can I add NetBSD-7.0 to my grub menu option when rebooting.
There is a similar post, currently looking into it.
UPDATE: I mounted NetBSD partition with sudo mount -t ufs -o ro,ufstype=ufs2 /dev/sdb2 /mnt/ (ufstype=44bsd did not work) and then ran grub-mkconfig -o /boot/grub/grub.cfg but yet the issue persists.
UPDATE: Rebooted and pressed c to get the grub command line. Following commands booted the NetBSD-7.0:
ls
Ran ls to see the correct name of disks and partitions, /dev/sdb2 on Linux was (hd0,gpt2) on Grub. Then ran the following:
insmod ufs2
set root=(hd0,gpt2)
knetbsd /netbsd
boot
And NetBSD-7.0 booted.
To add NetBSD option to Grub menu, modified file /etc/grub/40_custom on Arch Linux like below:
menuentry "NetBSD-7.0"{
insmod ufs2
set root=(hd0,gpt2)
knetbsd /netbsd
}
However, after modifying 40_custom like above, NetBSD option does not appear on Grub menu. I don't know why.
Unless you have a typo, it looks like the 40_custom file is in the wrong directory. it should be located at /etc/grub.d/40_custom, notice the .d.
If your /boot is located on a separate partition, make sure that it is mounted with mount /boot before generating the grub.cfg. Otherwise your new grub.cfg won't be used.
Check which partition grub is loading the configuration from by running echo ${prefix} within the grub command line. It's possible that grub is loading the configuration from a partition that you don't expect.
Verify that netbsd was added to the config with grep -i netbsd /boot/grub/grub.cfg before rebooting to avoid some frustration after generating grub.cfg
I've used buildroot to build a qemu compatible Linux kernel and root filesystem. I am emulating for the MPC8544DS machine and used the qemu_ppc_mpc8544ds_defconfig to generate these components. I was able to successfully build the kernel and the root filesystem. And was able to run it under qemu.
However when I tried to run uboot instead of the Linux Kernel (and the associated rootfs) it fails. Here is the way I invoke qemu to boot u-boot:
qemu-system-ppc -nographic -M mpc8544ds -m 512 -kernel ~/CrossCompilation/u-boot.bin and it fails like so:
Wrong image type 52, expected 2
qemu: could not load kernel '~/CrossCompilation/u-boot.bin'
I do not understand what else could be wrong. I've checked various blog posts over the internet and almost all of them use uboot.bin as the kernel (as opposed to srec and other formats)
could someone shed some light on the various image type numbers and which ones fit where?
UPDATE: This is how I compiled my u-boot
cd to u-boot dir
make distclean
make mrproper
make ARCH=powerpc CROSS_COMPILE=~/CrossCompilation/buildroot-2014.08/output/host/usr/bin/powerpc-buildroot-linux-gnuspe- MPC8544DS_defconfig
make ARCH=powerpc CROSS_COMPILE=~/CrossCompilation/buildroot-2014.08/output/host/usr/bin/powerpc-buildroot-linux-gnuspe-
Try removing the -kernel option. Make sure everything stay as is:
qemu-system-ppc -nographic -M mpc8544ds -m 512 ~/CrossCompilation/u-boot.bin
I compiled the Linux kernel (version 2.6.32) using the Emdebian ARM toolchain. Downloaded the initrd from Aurel's personal FTP server hosted on Debian here.
The ran qemu like so:
qemu-system-arm -M versatilepb -kernel zImage -hda hda.img -initrd initrd_versatile.gz -append "root=/dev/ram" -m 1024
Yet it fails with qemu reporting:
mount: mouting none of /run failed invalid argument.
Keen to hear if someone has something to say about this. As I search for it, could someone also let me know if it is possible to use an off the shelf initrd or is it related to the kernel version being run?
I was able to run the machine by cross compiling busybox, creating a cpio archive image and then using it like so:
qemu-system-arm -M versatilepb -m 128M -kernel zImage -initrd rootfs.img -append "root=/dev/ram rdinit=/bin/sh console=tty1"
Now that Ive got it working Ill investigate what those arguments actually mean.