projects / people / ms / u-boot.git / blame
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|---|---|---|
| d5587fa3 TT |
1 | # |
| 2 | # Copyright (C) 2017, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> | |
| 3 | # | |
| 4 | # SPDX-License-Identifier: GPL-2.0+ | |
| 5 | # | |
| 6 | ||
| e7ba41c6 TT |
7 | U-Boot on QEMU's 'virt' machine on ARM & AArch64 |
| 8 | ================================================ | |
| d5587fa3 TT |
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. | |
| e7ba41c6 | 12 | Both 32-bit ARM and AArch64 are supported. |
| d5587fa3 TT |
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 | |
| e7ba41c6 | 21 | - An ARMv7/ARMv8 architected timer |
| d5587fa3 TT |
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 | --------------- | |
| e7ba41c6 | 29 | Set the CROSS_COMPILE environment variable as usual, and run: |
| d5587fa3 | 30 | |
| e7ba41c6 | 31 | - For ARM: |
| d5587fa3 TT |
32 | make qemu_arm_defconfig |
| 33 | make | |
| 34 | ||
| e7ba41c6 TT |
35 | - For AArch64: |
| 36 | make qemu_arm64_defconfig | |
| 37 | make | |
| 38 | ||
| d5587fa3 TT |
39 | Running U-Boot |
| 40 | -------------- | |
| 41 | The minimal QEMU command line to get U-Boot up and running is: | |
| 42 | ||
| e7ba41c6 | 43 | - For ARM: |
| d5587fa3 TT |
44 | qemu-system-arm -machine virt,highmem=off -bios u-boot.bin |
| 45 | ||
| e7ba41c6 TT |
46 | - For AArch64: |
| 47 | qemu-system-aarch64 -machine virt,highmem=off -cpu cortex-a57 -bios u-boot.bin | |
| 48 | ||
| d5587fa3 | 49 | The 'highmem=off' parameter to the 'virt' machine is required for PCI to work |
| e7ba41c6 TT |
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. | |
| d5587fa3 TT |
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. |