针对Flash的Linux UBI子系统是怎样的

Linux UBI子系统是怎样的

UBI is a Linux subsystem which is designed to improve the flash memory management in Linux. It does this by providing a logical layer on top of the physical flash media. This logical layer is made up of a number of objects, each of which represents a physical erase block on the flash media.

The UBI subsystem is designed to be used with MTD devices, which are devices that allow access to raw flash memory. MTD devices are often used to store bootloader code or other firmware images.

The UBI subsystem provides a number of benefits over the traditional MTD subsystem. One of the most important benefits is that it allows the use of logical erase blocks. This means that an entire erase block does not have to be erased before it can be written to. This can significantly improve the write performance of flash memory devices.

Another benefit of the UBI subsystem is that it provides wear-leveling. This means that the flash memory is evenly worn over time, which can improve the lifespan of the device.

The UBI subsystem is also designed to be more robust than the traditional MTD subsystem. This is because it uses a number of techniques to ensure that data is not lost in the event of a power failure or other unexpected event.

Overall, the UBI subsystem is a significant improvement over the traditional MTD subsystem. It provides better performance and more robustness. It is also designed to be more user-friendly, making it easier to use for those who are not familiar with the underlying flash memory technology.