LINEOWarp!!® Features & Specs
Warp!! 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.
Snapshot Save Function
Warp!! has achieved its remarkable quick boot by restoring previouslysaved system memory from snapshot image instantly as turning on power. Technical capabilities of Lineo has realized such snapshot save*1 mechanism.
- Snapshot save can be carried out solely by your target device
- Most suitable snapshot save method is selectable for your product
- Smaller memory size to save
Warp!! only saves memory that is actually being used; it's independent of memory size of target device - Snapshot compression
Compress snapshot down to one-fifth to a half ( Compression ratio depends on snapshot data)
- Smaller memory size to save
- Attain high-speed by parallely processing with I/0
- Support fast compression saving mode
- Support multiple snapshots
- Even faster boot in separate mode*2
- Support SMP/AMP
- Possible to save entire SDRAM
- Snapshot can be saved in various storages such as: RAM、NOR/NAND Flash、SD、eMMC、SATA、PATA
- *1
- Snapshot : Snapshot is a captured image of system memory and hardware status (register contents) with application running. Snapshot image is saved to exclusively secured area in secondary storage such as flash memory. Warp!! attains its ultrafast boot by restoring system memory from snapshot image at once when power is turned on.
- *2
- Separate Mode : By saving a snapshot in twice, first group of memory load right after power on becomes smaller thus faster.
Selectable Boot Mode
Hibernation Mode
Save snapshot for each shutdown and restore previously-saved snapshot as power is on again.
Fast Boot Mode
Use the same snapshot for every boot.
Android Mode
Carry out ideal quick boot for Android system. User's setting value can be reflected as well. No particular save processing is necessary at the time of shutdown.
Multi-Core Support
Snapshot Split Save
It is expected that more and more SoC will be multi-core from now on, besides storage will be much faster after SD3.0/eMMC4.5.
To take full advantage of such progress, Warp!!5 provides snapshot split save mechanism.
Multi-Core
Multi-core makes it possible to save divided snapshot images to high-speed storage devices, assign CPU core for each images and restore them all at once.
Multi-Core / Multi-Storage
It is possible to attain optimized 1/0 by saving divided snapshot images to low-speed storage devices (thus less bus interference), assigning CPU core for each images and restoring them all at once.
User API for Multi-Core
By assigning CPU core exclusively to user thread, efficient system initialization is achieved. For instance, it is possible to synchronize subsystems prior to Linux boot in complex system with multiple subsystems..
UserAPI Support
By using user thread, it is possible to carry out parallel hardware initialization or to run application immediately after boot. Warp!! Software Development Kit contains sample program of UserAPI.
- Parallely execute snapshot decompression/read and user thread at an early stage after power is turned on.
- User can set periodically called function and, for example, reactivate OMA for transfer data to FPGA
Snapshot Switch Function
Snapshot switch was only available in bootloader in Warp!!4, but it can be done by kernel command in Warp!!5. In Exchange Mode, save the last status just like hibernation and switch to other snapshot, thus it can switch OS while retaining multiple OS status. On the other hand, Overwrite Mode does not save snapshot thus switch multiple OS even faster. However, it returns to the initial statup status after switching.
