Linux - The Embedded Rust Book

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# Linux

Here are the installation commands for a few Linux distributions.

## Packages

- Ubuntu 18.04 or newer / Debian stretch or newer

> NOTE `gdb-multiarch` is the GDB command you’ll use to debug your ARM Cortex-M programs

    sudo apt install gdb-multiarch openocd qemu-system-arm

- Ubuntu 14.04 and 16.04

> NOTE `arm-none-eabi-gdb` is the GDB command you’ll use to debug your ARM Cortex-M programs

    sudo apt install gdb-arm-none-eabi openocd qemu-system-arm

- Fedora 27 or newer

    sudo dnf install gdb openocd qemu-system-arm

- Arch Linux

> NOTE `arm-none-eabi-gdb` is the GDB command you’ll use to debug ARM Cortex-M programs

    sudo pacman -S arm-none-eabi-gdb qemu-system-arm openocd

## udev rules

This rule lets you use OpenOCD with the Discovery board without root privilege.

Create the file `/etc/udev/rules.d/70-st-link.rules` with the contents shown below.

    # STM32F3DISCOVERY rev A/B - ST-LINK/V2
    ATTRS{idVendor}=="0483", ATTRS{idProduct}=="3748", TAG+="uaccess"

    # STM32F3DISCOVERY rev C+ - ST-LINK/V2-1
    ATTRS{idVendor}=="0483", ATTRS{idProduct}=="374b", TAG+="uaccess"

Then reload all the udev rules with:

    sudo udevadm control --reload-rules

If you had the board plugged to your laptop, unplug it and then plug it again.

You can check the permissions by running this command:

    lsusb

Which should show something like

    (..)
    Bus 001 Device 018: ID 0483:374b STMicroelectronics ST-LINK/V2.1
    (..)

Take note of the bus and device numbers. Use those numbers to create a path like `/dev/bus/usb/<bus>/<device>`. Then use this path like so:

    ls -l /dev/bus/usb/001/018

    crw-------+ 1 root root 189, 17 Sep 13 12:34 /dev/bus/usb/001/018

    getfacl /dev/bus/usb/001/018 | grep user

    user::rw-
    user:you:rw-

The `+` appended to permissions indicates the existence of an extended permission. The `getfacl` command tells the user `you` can make use of this device.

Now, go to the next section.