On Ubuntu 20.04, I installed the xv6 project using the page Tools Used in 6.828
$ sudo apt-get install git build-essential gdb-multiarch qemu-system-misc gcc-riscv64-linux-gnu binutils-riscv64-linux-gnu
The file version that they checked on the web page are
$ riscv64-unknown-elf-gcc --version
riscv64-unknown-elf-gcc () 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ qemu-system-riscv64 --version
QEMU emulator version 5.2.50 (v5.2.0-2349-g51db2d7cf2)
Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers
On xv6-riscv
$ make qemu
# ... lots of output ...
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
The program get stuck there. The vm is not booted and no prompt is shown.
Any ideas on how to fix this are welcomed.
This has been mentioned in Tools Used in 6.S081
At this moment in time, it seems that the package qemu-system-misc has received an update that breaks its compatibility with our kernel. If you run make qemu and the script appears to hang after
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.0you'll need to uninstall that package and install an older version:
$ sudo apt-get remove qemu-system-misc $ sudo apt-get install qemu-system-misc=1:4.2-3ubuntu6