Hibernation Start-Up

Warp!! saves snapshot image of the system memory (while applications are running) and hardware status (contents of register) to the previously ensured hibernation area in secondary storage, such as Flash. Once the power is on, directly restore memory image from snapshot at a burst. By this operation, loads of initiation code loading and memory accessing are greatly reduced and achieve the high speed.

  Points

The key of speed-up is high speed expansion of snapshot images to RAM.

• - Reduce size of snapshot image to be saved.
• - Ensured throughput of secondary storage.
• - High speed decompression of compressed data.

  Supported Functions

* Snapshot Saving

Execute snapshot saving on a target board with a system that SRAM is available, entire SDRAM can be saved.

• - Even smaller memory size
• Memory size to save snapshot is shrunk from 32 MB to 19 MB (On Armadillo-500 demo board)
• - Support snapshot compression
• Can be compressed down to half (compressibility depends on snapshot data)
• - Support multiple snapshots handling

* Hibernation Start-up (Regular hibernation function is also available)

  System requirements

The following are required.
An area where hibernation driver is stored. （ROM 32K）

And area where snapshot of system memory is saved other than a memory area for Root file system.
• - bootloader
  *Added Hibernation Driver call.
• - kernel
  *Various drivers are implemented to support Suspend/Resume of PM.
  *Apply patch for Warp!! such as Hibernation Driver call.

  Warp!!2 New features

Further enhances compression of memory to be saved.

• ex.) In the case of Armadillo-500 demo, memory to be saved can be reduced from 32M to 18.3M.

Supports multiple snapshots handling.
Supports snapshot compression.
Compression rate depends on snapshot data, but it can be reduced to approx. 1/2.

• ex.) In the case of Armadillo-500 demo, preserved target memory can be compressed　from 18.3M to 6.8M..

  Warp!!3 New features

• - Further enhances compression and decompression time.
• - In addition to compression and non-compression mode, new save method is available.
• - Supports wealth of options such as ATA, SATA, and SD Interface.

  More supported architectures

*There are more supported architectures available.

ARM	Cortex-A8 / ARM11 / ARM9 / Marvell Sheeva
SuperH	SH-4 / SH-4A / SH-4AL
Power Architecture	Power QUICC II Pro / Power QUICC-III / 440 / 464
MIPS	MIPS 32R2  / MIPS24kEf

Observed value with demo

Device's startup time with Warp!! differs depending on hardware specifications.