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OTP Build and Test Infrastructure

OTP image configurations are defined using hjson objects. Currently there are two ways to build images:

  1. Pre-built OTP image overlays defined in hjson. These is the approach currently used in most DV test cases.
  2. Dynamically built OTP image overlays defined in Bazel. This is the approach currently used in FPGA and Silicon Validation (SiVal) targets.

Bazel

See //hw/ip/otp_ctrl/data/BUILD for detailed references on the rules described below.

OTP HJSON Map

OTP image overlays are first defined using the otp_json Bazel rule. The following example shows the definition of a SECRET2 partition configuration:

otp_json(
    name = "otp_json_secret2_unlocked",
    partitions = [
        otp_partition(
            name = "SECRET2",
            items = {
                "RMA_TOKEN": "<random>",
                "CREATOR_ROOT_KEY_SHARE0": "<random>",
                "CREATOR_ROOT_KEY_SHARE1": "<random>",
            },
            lock = False,
        ),
    ],
)

See //rules/otp.bzl for additional documentation on additional parameters available in the otp_json rule.

OTP Image

An OTP image is a collection of OTP JSON files used to create an OTP image. An OTP can have multiple otp_json dependencies. Each dependency has the ability of override the values of the previous dependency, so the order in which these are listed is important.

# Represents a device in DEV state with the SECRET0 and SECRET1 partitions in
# locked state. SECRET2 partition is unlocked.
otp_image(
    name = "img_dev_individualized",
    src = ":otp_json_dev",
    overlays = [
        ":otp_json_secret0",
        ":otp_json_secret1",
    ] + STD_OTP_OVERLAYS_WITHOUT_SECRET_PARTITIONS,
)

In this example, the src attribute points to the baseline OTP JSON configuration, and the list of overlay dependencies are applied in order of precedence in the overlays attribute.

The STD_OTP_OVERLAYS_WITHOUT_SECRET_PARTITIONS definition imported from //rules:otp.bzl declares a list of otp_json targets that are used as overlays. There are other list of predefined overlays that are used throughout the code base.

FPGA Integration

See FPGA bitstreams documentation for more details.