| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 1 | # |
| 2 | # Copyright (C) 2017, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> |
| 3 | # |
| 4 | # SPDX-License-Identifier: GPL-2.0+ |
| 5 | # |
| 6 | |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 7 | U-Boot on QEMU's 'virt' machine on ARM & AArch64 |
| 8 | ================================================ |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 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. |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 12 | Both 32-bit ARM and AArch64 are supported. |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 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 |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 21 | - An ARMv7/ARMv8 architected timer |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 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 | --------------- |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 29 | Set the CROSS_COMPILE environment variable as usual, and run: |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 30 | |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 31 | - For ARM: |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 32 | make qemu_arm_defconfig |
| 33 | make |
| 34 | |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 35 | - For AArch64: |
| 36 | make qemu_arm64_defconfig |
| 37 | make |
| 38 | |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 39 | Running U-Boot |
| 40 | -------------- |
| 41 | The minimal QEMU command line to get U-Boot up and running is: |
| 42 | |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 43 | - For ARM: |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 44 | qemu-system-arm -machine virt,highmem=off -bios u-boot.bin |
| 45 | |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 46 | - For AArch64: |
| 47 | qemu-system-aarch64 -machine virt,highmem=off -cpu cortex-a57 -bios u-boot.bin |
| 48 | |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 49 | The 'highmem=off' parameter to the 'virt' machine is required for PCI to work |
| Tuomas Tynkkynen | 87145cf | 2018-01-11 16:11:24 +0200 | [diff] [blame^] | 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. |
| Tuomas Tynkkynen | a1c2178 | 2017-10-09 19:42:41 +0300 | [diff] [blame] | 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. |