Device firmware are binary blobs containing code that are executed by device hardware. The binary blob is available in the driver's namespace for loading.
Device firmware are stored in CIPD (Chrome Infrastructure Package Deployment) and mirrored in Google Storage.
To create a firmware package, create a directory containing the following files:
README.fuchsia must contain at least the following directives:
If this is the first time you uploaded to CIPD from the host system, authenticate with CIPD:
fx cipd auth-login
Upload and tag the package in CIPD using the following command:
fx cipd create -in <package-directory> -install-mode copy \ -name <package-name> \ -tag git_repository:<source-git-repositry> \ -tag git_revision:<source-git-revision>
package-name has the format
<name> should be a string that identifies the firmware. It may contain any non-whitespace character. It is helpful to identify the driver that will use the firmware in the name.
After this step, the package is uploaded to CIPD. Check the CIPD browser here for packages under
Add the following entry in
@Subdir firmware/<name> <package-name> git_revision:<source-git-revision>
<source-git-revision> matches the values passed to
cipd create above. The package will be downloaded to the path specified by
prebuilt/zircon.versions with the following command:
Upload this change to Gerrit and send it to the CQ. The firmware package will be downloaded by
scripts/download-prebuilt along with the toolchain and QEMU.
Add the following line to the driver's
MODULE_FIRMWARE := <name>/<path-to-binary-blob>
This will install the firmware to bootfs under
load_firmware() API, defined in
driver.h loads the firmware pointed to by the path in a VMO.