doc/README.qemu-arm

   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.