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@micro-os-plus/devices-qemu-cortexa

A source library xPack with the µOS++ QEMU Cortex-A board support files

QEMU implements several Cortex-A boards, which can be used for running tests.

• https://www.qemu.org/docs/master/system/target-arm.html
• https://www.qemu.org/docs/master/system/arm/virt.html

This project provides the initialization code required to build applications running on these boards.

It is intended to be included in unit tests, which generally do not need peripherals.

Maintainer info

This page is addressed to developers who plan to include this source library into their own projects.

For maintainer info, please see the README-MAINTAINER file.

Install

As a source library xPacks, the easiest way to add it to a project is via xpm, but it can also be used as any Git project, for example as a submodule.

Prerequisites

A recent xpm, which is a portable Node.js command line application.

For details please follow the instructions in the xPack install page.

xpm

Note: the package will be available from npmjs.com at a later date.

For now, it can be installed from GitHub:

cd my-project
xpm init # Unless a package.json is already present

xpm install github:micro-os-plus/devices-qemu-cortexa-xpack

When ready, this package will be available as @micro-os-plus/devices-qemu-cortexa from the npmjs.com registry:

cd my-project
xpm init # Unless a package.json is already present

xpm install @micro-os-plus/devices-qemu-cortexa@latest

ls -l xpacks/micro-os-plus-devices-qemu-cortexa

Git submodule

If, for any reason, xpm is not available, the next recommended solution is to link it as a Git submodule below an xpacks folder.

cd my-project
git init # Unless already a Git project
mkdir -p xpacks

git submodule add https://github.com/micro-os-plus/devices-qemu-cortexa-xpack.git \
  xpacks/micro-os-plus-devices-qemu-cortexa-xpack

Branches

Apart from the unused master branch, there are two active branches:

• xpack, with the latest stable version (default)
• xpack-develop, with the current development version

All development is done in the xpack-develop branch, and contributions via Pull Requests should be directed to this branch.

When new releases are published, the xpack-develop branch is merged into xpack.

Developer info

This project can be used as-is for simple tests or blinky projects.

It can also be copied into the user project, the configuration updated, and content regenerated, at any time.

Status

The QEMU Cortex-A support is work in progress.

Limitations

The emulated boards provide a limited range of peripherals, but for running unit tests these peripherals are not necessary.

The current initialisation code does not touch them.

Build & integration info

To integrate this package into user projects, consider the following details:

Include folders

The following folders should be passed to the compiler during the build:

• include

The header files to be included in user project are:

#include <micro-os-plus/device.h>

Source files

The source files to be added to user projects are:

• src/boot.S

Preprocessor definitions

• MICRO_OS_PLUS_INCLUDE_MICRO_OS_PLUS_DIAG_TRACE to enable the trace_printf() calls in Error_Handler() and assert_failed().

Compiler options

• -std=c++20 or higher for C++ sources
• -std=c11 for C sources

Interrupt handlers

Only the standard Cortex-A trap handlers are used.

C++ Namespaces

• none

C++ Classes

• none

Examples

TBD

Known problems

• none

Tests

TBD

Change log - incompatible changes

According to semver rules:

Major version X (X.y.z | X > 0) MUST be incremented if any backwards incompatible changes are introduced to the public API.

The incompatible changes, in reverse chronological order, are:

• v2.x: interrupt-vectors & exception-handlers moved here; Reset_Handler renamed with capital letters
• v1.x: initial release

License

The original content is released under the MIT License, with all rights reserved to Liviu Ionescu.