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 & AArch64
   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 Both 32-bit ARM and AArch64 are supported.
  13
  14 The 'virt' platform provides the following as the basic functionality:
  15
  16     - A freely configurable amount of CPU cores
  17     - U-Boot loaded and executing in the emulated flash at address 0x0
  18     - A generated device tree blob placed at the start of RAM
  19     - A freely configurable amount of RAM, described by the DTB
  20     - A PL011 serial port, discoverable via the DTB
  21     - An ARMv7/ARMv8 architected timer
  22     - PSCI for rebooting the system
  23     - A generic ECAM-based PCI host controller, discoverable via the DTB
  24
  25 Additionally, a number of optional peripherals can be added to the PCI bus.
  26
  27 Building U-Boot
  28 ---------------
  29 Set the CROSS_COMPILE environment variable as usual, and run:
  30
  31 - For ARM:
  32     make qemu_arm_defconfig
  33     make
  34
  35 - For AArch64:
  36     make qemu_arm64_defconfig
  37     make
  38
  39 Running U-Boot
  40 --------------
  41 The minimal QEMU command line to get U-Boot up and running is:
  42
  43 - For ARM:
  44     qemu-system-arm -machine virt,highmem=off -bios u-boot.bin
  45
  46 - For AArch64:
  47     qemu-system-aarch64 -machine virt,highmem=off -cpu cortex-a57 -bios u-boot.bin
  48
  49 The 'highmem=off' parameter to the 'virt' machine is required for PCI to work
  50 in U-Boot. Also, for some odd reason qemu-system-aarch64 needs to be explicitly
  51 told to use a 64-bit CPU or it will boot in 32-bit mode.
  52
  53 Additional peripherals that have been tested to work in both U-Boot and Linux
  54 can be enabled with the following command line parameters:
  55
  56 - To add a Serial ATA disk via an Intel ICH9 AHCI controller, pass e.g.:
  57     -drive if=none,file=disk.img,id=mydisk -device ich9-ahci,id=ahci -device ide-drive,drive=mydisk,bus=ahci.0
  58 - To add an Intel E1000 network adapter, pass e.g.:
  59     -netdev user,id=net0 -device e1000,netdev=net0
  60 - To add an EHCI-compliant USB host controller, pass e.g.:
  61     -device usb-ehci,id=ehci
  62 - To add a NVMe disk, pass e.g.:
  63     -drive if=none,file=disk.img,id=mydisk -device nvme,drive=mydisk,serial=foo
  64
  65 These have been tested in QEMU 2.9.0 but should work in at least 2.5.0 as well.