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Pandy Song

Run u-boot in qemu


In u-boot source code doc/README.qemu-arm, it could be found that u-boot could run under qemu. This could help to understand or experiment u-boot without a real hardware.

How to

I am running this in a ubuntu virtual machine on my mac book.

This is for running arm:

export CROSS_COMPILE=arm-linux-gnueabi-
make qemu_arm_defconfig
make cscope # This is optional

For AArch64, replace CROSS_COMPILE with correct cross compiler and then:

export CROSS_COMPILE=aarch64-linux-gnu-
make qemu_arm64_defconfig

BTW, install the cross-compiler for aarch64:

sudo apt-get install gcc-aarch64-linux-gnu


I am running in a virtual machine by ssh to it

qemu-system-arm -curses -machine virt -bios u-boot.bin

I need -curses, otherwise it will complain:

Could not initialize SDL(No available video device) - exiting

For AArch64:

qemu-system-aarch64 -curses -machine virt -cpu cortex-a57 -bios u-boot.bin

Press Esc + 1 to go to the qemu monitor command line interface, you could type help to get all qemu command, e.g. stop to stop emulation:

compat_monitor0 console
QEMU 2.11.1 monitor - type 'help' for more information

Press Esc + 2 to go to the u-boot interface.

serial0 console

U-Boot 2018.09 (Apr 25 2019 - 21:37:28 +1000)

DRAM:  128 MiB
WARNING: Caches not enabled
In:    pl011@9000000
Out:   pl011@9000000
Err:   pl011@9000000
Net:   No ethernet found.
Hit any key to stop autoboot:  0
scanning bus for devices...

Device 0: unknown device
starting USB...
No controllers found
No ethernet found.
No ethernet found.

QEMU version

This is tested on the following version:

pandy@ubuntu:~/u-boot-2018.09$ qemu-system-arm --version
QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.8)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers