meta-cassini repository provides three layers compatible with the Yocto
Project, in the following sub-directories:
A Yocto layer which holds board-specific recipes or append files that either:
will not be upstreamed (Cassini specific modifications)
have not been upstreamed yet
For the N1SDP hardware target platform, this layer currently extends the n1sdp machine definition from the meta-arm-bsp layer with additional Trusted Services (crypto, storage, internal trusted storage, attestation , block storage)
A Yocto distribution layer providing top-level and general policies for the Cassini distribution images.
A Yocto software layer with recipes that include run-time tests to validate Cassini functionalities.
Layer Dependency Overview¶
The following diagram illustrates the layers which are integrated by the
Cassini project, which are further expanded on below.
The layer revisions are related to the Cassini
Cassini distribution depends on the following layer dependency sources:
URL: https://git.yoctoproject.org/git/poky layers: meta, meta-poky branch: mickledore revision: 0a98281d37b0bd8dc1548c390216cb3978e36e0e URL: https://git.openembedded.org/meta-openembedded layers: meta-filesystems, meta-networking, meta-oe, meta-python branch: mickledore revision: 03fd1d368ac19793b3e4c35159ba2ce802247e4d URL: https://git.yoctoproject.org/git/meta-virtualization layer: meta-virtualization branch: mickledore revision: b2bac21615b16dfd281646ee8b0f1e384981633e URL: https://git.yoctoproject.org/git/meta-security layers: meta-parsec branch: mickledore revision: d7db0a3bd1a8639df7570483f003ce00cbe274a2
An additional layer dependency source is conditionally required, depending on
the specific Cassini distribution image being built. This layer dependency
source is the
meta-arm repository, which provides three Yocto layers:
URL: https://git.yoctoproject.org/git/meta-arm layers: meta-arm, meta-arm-bsp, meta-arm-toolchain branch: mickledore revision: 10c355b9c7c1376301e9fceb5d40a5a7247ced17
The layers required from
meta-arm depend on the Cassini distribution image:
Cassini SDK distribution images require
meta-arm-toolchain, as the
gator-daemonpackage is installed on the rootfs.
A Cassini distribution image built for the N1SDP hardware target platform requires
These layers are described as follows:
Clean separation between Firmware and OS.
The canonical source for SystemReady firmware.
Board specific components for Arm target platforms.
Provides toolchain for Arm target platforms