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1 | # |
2 | # Copyright (C) 2017, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> | |
3 | # | |
4 | # SPDX-License-Identifier: GPL-2.0+ | |
5 | # | |
6 | ||
7 | U-Boot on QEMU's 'virt' machine on ARM | |
8 | ====================================== | |
9 | ||
10 | QEMU for ARM supports a special 'virt' machine designed for emulation and | |
11 | virtualization purposes. This document describes how to run U-Boot under it. | |
12 | ||
13 | The 'virt' platform provides the following as the basic functionality: | |
14 | ||
15 | - A freely configurable amount of CPU cores | |
16 | - U-Boot loaded and executing in the emulated flash at address 0x0 | |
17 | - A generated device tree blob placed at the start of RAM | |
18 | - A freely configurable amount of RAM, described by the DTB | |
19 | - A PL011 serial port, discoverable via the DTB | |
20 | - An ARMv7 architected timer | |
21 | - PSCI for rebooting the system | |
22 | - A generic ECAM-based PCI host controller, discoverable via the DTB | |
23 | ||
24 | Additionally, a number of optional peripherals can be added to the PCI bus. | |
25 | ||
26 | Building U-Boot | |
27 | --------------- | |
28 | Set the CROSS_COMPILE and ARCH=arm environment variables as usual, and run: | |
29 | ||
30 | make qemu_arm_defconfig | |
31 | make | |
32 | ||
33 | Running U-Boot | |
34 | -------------- | |
35 | The minimal QEMU command line to get U-Boot up and running is: | |
36 | ||
37 | qemu-system-arm -machine virt,highmem=off -bios u-boot.bin | |
38 | ||
39 | The 'highmem=off' parameter to the 'virt' machine is required for PCI to work | |
40 | in U-Boot. | |
41 | ||
42 | Additional peripherals that have been tested to work in both U-Boot and Linux | |
43 | can be enabled with the following command line parameters: | |
44 | ||
45 | - To add a Serial ATA disk via an Intel ICH9 AHCI controller, pass e.g.: | |
46 | -drive if=none,file=disk.img,id=mydisk -device ich9-ahci,id=ahci -device ide-drive,drive=mydisk,bus=ahci.0 | |
47 | - To add an Intel E1000 network adapter, pass e.g.: | |
48 | -netdev user,id=net0 -device e1000,netdev=net0 | |
49 | - To add an EHCI-compliant USB host controller, pass e.g.: | |
50 | -device usb-ehci,id=ehci | |
51 | - To add a NVMe disk, pass e.g.: | |
52 | -drive if=none,file=disk.img,id=mydisk -device nvme,drive=mydisk,serial=foo | |
53 | ||
54 | These have been tested in QEMU 2.9.0 but should work in at least 2.5.0 as well. |