| { |
| "_comment": "See README_disk_layout", |
| |
| "metadata":{ |
| "block_size": 512, |
| "fs_block_size": 4096 |
| }, |
| "layouts":{ |
| "_comment": "base is the standard layout template. Also used for installs.", |
| "base": [ |
| { |
| "_comment": "Reserve space for RW firmware. Only used on some boards.", |
| "num": 11, |
| "label":"RWFW", |
| "type":"firmware", |
| "blocks":"16384" |
| }, |
| { |
| "_comment": "Unused partition, reserved for software slot C.", |
| "num": 6, |
| "label":"KERN-C", |
| "type":"kernel", |
| "blocks":"1" |
| }, |
| { |
| "_comment": "Unused partition, reserved for software slot C.", |
| "num": 7, |
| "label":"ROOT-C", |
| "type":"rootfs", |
| "blocks":"1" |
| }, |
| { |
| "_comment": "Unused partition, reserved for future changes.", |
| "num": 9, |
| "type":"reserved", |
| "label":"reserved", |
| "blocks":"1" |
| }, |
| { |
| "_comment": "Unused partition, reserved for future changes.", |
| "num": 10, |
| "type":"reserved", |
| "label":"reserved", |
| "blocks":"1" |
| }, |
| { |
| "_comment": "Pad out so Kernel A starts on a 4096 block boundry for", |
| "_comment": " performance. This is especially important on Daisy.", |
| "type":"blank", |
| "blocks":"4028" |
| }, |
| { |
| "_comment": "Kernel for Slot A, no file system.", |
| "num": 2, |
| "label":"KERN-A", |
| "type":"kernel", |
| "blocks":"32768" |
| }, |
| { |
| "_comment": "Kernel for Slot B, no file system.", |
| "num": 4, |
| "label":"KERN-B", |
| "type":"kernel", |
| "blocks":"32768" |
| }, |
| { |
| "_comment": "Board specific files, mostly unused.", |
| "num": 8, |
| "label":"OEM", |
| "type":"data", |
| "fs_format":"ext4", |
| "blocks":"32768", |
| "uuid": "random" |
| }, |
| { |
| "_comment": "Pad out, but not sure why.", |
| "type":"blank", |
| "blocks":"131072" |
| }, |
| { |
| "_comment": "Used for Legacy Bios, and EFI Bios, not ChromeOS hardware", |
| "num": 12, |
| "label":"EFI-SYSTEM", |
| "type":"efi", |
| "fs_format":"vfat", |
| "blocks":"32768", |
| "uuid": "clear" |
| }, |
| { |
| "_comment": "Slot B rootfs. Must match Root A in side for normal", |
| "_comment": "updates. Will contain copy of Root A after install, and", |
| "_comment": "contain new rootfs's after runtime updates.", |
| "num": 5, |
| "label":"ROOT-B", |
| "type":"rootfs", |
| "blocks":"4194304" |
| }, |
| { |
| "_comment": "Slot A rootfs. Rootfs + extras must fit.", |
| "_comment": "FS size + Verity (64 * FS blocks) + Boot Cache (200M).", |
| "_comment": "", |
| "_comment": "Note that updates will fail if the rootfs size", |
| "_comment": "shrinks. (crbug.com/192136)", |
| "_comment": "", |
| "_comment": "Changes to the offset of this partition may require", |
| "_comment": "changes in cros-signing/security_test_baselines/", |
| "_comment": "ensure_secure_kernelparams.config to allow secure boot.", |
| "num": 3, |
| "label":"ROOT-A", |
| "type":"rootfs", |
| "fs_format":"ext2", |
| "blocks":"4194304", |
| "fs_blocks":"313344", |
| "uuid": "clear" |
| }, |
| { |
| "_comment": "User data, fills all remaining space on drive.", |
| "num": 1, |
| "label":"STATE", |
| "type":"data", |
| "fs_format":"ext4", |
| "blocks":"2097152", |
| "features":["expand"], |
| "uuid": "random" |
| } |
| ], |
| "_comment": "Used for bootable USB installs (not recovery).", |
| "usb": [ |
| { |
| "_comment": "Shrunken rootfs partition to support smaller USB sticks.", |
| "_comment": "installation will expand this to size from base.", |
| "num": 3, |
| "blocks":"2539520" |
| }, |
| { |
| "_comment": "Slot B rootfs, unused on USB, but pad to 2M.", |
| "_comment": "installation will expand this to size from base.", |
| "num": 5, |
| "blocks":"4096" |
| } |
| ], |
| "_comment": "Used for factory install images.", |
| "factory_install": [ |
| { |
| "num": 1, |
| "blocks":"286720" |
| }, |
| { |
| "num": 3, |
| "blocks":"860160", |
| "fs_blocks":"102400" |
| }, |
| { |
| "num": 5, |
| "blocks":"4096" |
| }, |
| { |
| "num": 12, |
| "blocks":"65536" |
| } |
| ], |
| "_comment": "Used for recovery images.", |
| "recovery": [ |
| { |
| "_comment": "Stateful on recovery is dynamically resized larger.", |
| "num": 1, |
| "blocks":"4096" |
| }, |
| { |
| "_comment": "Shrunken rootfs partition to support smaller USB sticks,", |
| "_comment": "and smaller recovery downloads.", |
| "_comment": "Installation will expand this to size from base.", |
| "_comment": "The offset to the beginning of this partition, and the FS", |
| "_comment": "size must match base exactly to allow secure boot.", |
| "num": 3, |
| "blocks":"2539520" |
| }, |
| { |
| "_comment": "Slot B rootfs, unused on USB, but pad to 2M.", |
| "_comment": "installation will expand this to size from base.", |
| "num": 5, |
| "blocks":"4096" |
| } |
| ], |
| "_comment": "Larger rootfs, suitable for development with symbols, etc.", |
| "_comment": "Cannot apply updates when running from USB (no slot B).", |
| "2gb-rootfs": [ |
| { |
| "_comment": "Will be shrunk to size from base on install.", |
| "num": 3, |
| "blocks":"4194304", |
| "fs_blocks":"512000" |
| }, |
| { |
| "_comment": "Will be grown to size from base on install.", |
| "num": 5, |
| "blocks":"4096" |
| } |
| ], |
| "_comment": "Larger rootfs, suitable for development with symbols, etc.", |
| "_comment": "CAN apply updates when running from USB.", |
| "2gb-rootfs-updatable": [ |
| { |
| "num": 1, |
| "blocks":"6291456" |
| }, |
| { |
| "_comment": "The partition size matches base, so it's installable.", |
| "num": 3, |
| "blocks":"4194304", |
| "fs_blocks":"512000" |
| }, |
| { |
| "_comment": "The partition size matches base, so it's installable.", |
| "num": 5, |
| "blocks":"4194304" |
| } |
| ], |
| "_comment": "Very large rootfs, suitable for development with symbols,", |
| "_comment": "etc. Cannot apply updates when running from USB (no slot B)", |
| "4gb-rootfs": [ |
| { |
| "_comment": "This partition is larger than the base partition, so the", |
| "_comment": "installer will corrupt the disk during installation.", |
| "num": 3, |
| "blocks":"8388608", |
| "fs_blocks":"1024000" |
| }, |
| { |
| "num": 5, |
| "blocks":"4096" |
| } |
| ] |
| } |
| } |
