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author | Bin Meng <bmeng.cn@gmail.com> | 2019-07-18 00:34:15 -0700 |
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committer | Tom Rini <trini@konsulko.com> | 2019-07-24 10:07:24 -0400 |
commit | c586ff0122eadc7063ae9ee5c8aef88724c981d7 (patch) | |
tree | 10b98798b6aff2c3f4c9bac3991529d22c3f8f0b /doc/board/emulation/qemu-arm.rst | |
parent | 7a0c834fb8d7719a08c0c1e550a82d6dc152d9f0 (diff) |
doc: board: Convert README.qemu-arm to reST
Convert plain text documentation to reStructuredText format and add
it to Sphinx TOC tree. No essential content change.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'doc/board/emulation/qemu-arm.rst')
-rw-r--r-- | doc/board/emulation/qemu-arm.rst | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/doc/board/emulation/qemu-arm.rst b/doc/board/emulation/qemu-arm.rst new file mode 100644 index 0000000000..ca751d4af4 --- /dev/null +++ b/doc/board/emulation/qemu-arm.rst @@ -0,0 +1,82 @@ +.. SPDX-License-Identifier: GPL-2.0+ +.. Copyright (C) 2017, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> + +QEMU ARM +======== + +QEMU for ARM supports a special 'virt' machine designed for emulation and +virtualization purposes. This document describes how to run U-Boot under it. +Both 32-bit ARM and AArch64 are supported. + +The 'virt' platform provides the following as the basic functionality: + + - A freely configurable amount of CPU cores + - U-Boot loaded and executing in the emulated flash at address 0x0 + - A generated device tree blob placed at the start of RAM + - A freely configurable amount of RAM, described by the DTB + - A PL011 serial port, discoverable via the DTB + - An ARMv7/ARMv8 architected timer + - PSCI for rebooting the system + - A generic ECAM-based PCI host controller, discoverable via the DTB + +Additionally, a number of optional peripherals can be added to the PCI bus. + +Building U-Boot +--------------- +Set the CROSS_COMPILE environment variable as usual, and run: + +- For ARM:: + + make qemu_arm_defconfig + make + +- For AArch64:: + + make qemu_arm64_defconfig + make + +Running U-Boot +-------------- +The minimal QEMU command line to get U-Boot up and running is: + +- For ARM:: + + qemu-system-arm -machine virt -bios u-boot.bin + +- For AArch64:: + + qemu-system-aarch64 -machine virt -cpu cortex-a57 -bios u-boot.bin + +Note that for some odd reason qemu-system-aarch64 needs to be explicitly +told to use a 64-bit CPU or it will boot in 32-bit mode. + +Additional persistent U-boot environment support can be added as follows: + +- Create envstore.img using qemu-img:: + + qemu-img create -f raw envstore.img 64M + +- Add a pflash drive parameter to the command line:: + + -drive if=pflash,format=raw,index=1,file=envstore.img + +Additional peripherals that have been tested to work in both U-Boot and Linux +can be enabled with the following command line parameters: + +- To add a Serial ATA disk via an Intel ICH9 AHCI controller, pass e.g.:: + + -drive if=none,file=disk.img,id=mydisk -device ich9-ahci,id=ahci -device ide-drive,drive=mydisk,bus=ahci.0 + +- To add an Intel E1000 network adapter, pass e.g.:: + + -netdev user,id=net0 -device e1000,netdev=net0 + +- To add an EHCI-compliant USB host controller, pass e.g.:: + + -device usb-ehci,id=ehci + +- To add a NVMe disk, pass e.g.:: + + -drive if=none,file=disk.img,id=mydisk -device nvme,drive=mydisk,serial=foo + +These have been tested in QEMU 2.9.0 but should work in at least 2.5.0 as well. |