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[DISK-LAYOUT] Add support for Sysdata and double slot

Davide Cardillo requested to merge scarthgap_system_update into scarthgap_kickoff

The new layout is designed to accommodate additional requirements, including:

  • SysData partition;
  • Reduntant slot partitions

At first, the concept of slot as been introduced. The existing variable:

WKS_BOOTFS_ROOTFS_PARTITION_LAYOUT_LIST

has been repalced with

WKS_BASIC_SLOT_PARTITION_LAYOUT_LIST

This new variable defines the list of partitions that make up a slot. A slot represents a portion of the system image (typically including bootfs and rootfs) that can be duplicated to provide redundancy (e.g., for OTA updates). Currently, only a single main slot is defined. However, the design allows for additional slots to be added in the future.

Consequently also the variable

WKS_BOOTFS_ROOTFS_PARTITION_LAYOUT

has been replaced with

WKS_SLOT_PARTITION_LAYOUT

This variable handles the duplication mechanism. If the DISTRO_FEATURES contains

redundant-slot,

then WKS_BASIC_SLOT_PARTITION_LAYOUT_LIST is included twice in the layout to provide redundancy.

An similar logic has been used to provide the way to add SysData partition inside the disk layout: a new kind of partition set has been introduced:

WKS_SYSTEM_BOOT_PARTITION_LAYOUT

This last is similar to the already present WKS_MACHINE_BOOT_PARTITION_LAYOUT, where there is no longer a dependency to the specific used MACHINE but instead there is a SYSTEM dependency.

To enable the SysData partition inside this set, the following DISTRO_FEATURES has to be set:

sysdata

JIRA Reference:[CLEAOS-649]

Signed-off-by: default avatarDavide Cardillo davide.cardillo@seco.com

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