Early MediaTek devices often used NAND flash with a different file system layout (e.g., YAFFS2). Starting with MT6589, eMMC became the dominant storage medium. The emmc in the filename signifies:
Older MT6575/MT6577 used scatter.txt. MT6589 adopted scatter_emmc.txt to differentiate the storage type. Early MediaTek devices often used NAND flash with
A scatter file is a plain-text configuration file that describes the memory map of an Android device based on MediaTek (or similar) chipsets. It tells flashing software exactly where to write each firmware component on the eMMC (embedded MultiMediaCard) storage chip. Older MT6575/MT6577 used scatter
For the MT6589, the scatter file is chipset-specific because partition addresses, sizes, and names are tied to the Boot ROM (BRom) and Preloader expectations. A scatter file is a plain-text configuration file
Unlike newer MediaTek chips (MT67xx+, MT68xx) that have moved to scatter-xml or dynamic partition schemes (super partitions), the MT6589 relies on a legacy, linear partition layout. The scatter file is a plain-text, key-value-pair document. Its most defining feature for MT6589 is the linear_start_addr field, which specifies physical byte offsets into the eMMC.
In the context of MediaTek devices, a scatter file (often named "scatter.txt" or "emmc.txt" for devices with eMMC storage) is a critical document. It contains information about the memory layout of the device, specifying where different components of the Android operating system and other data should be written. Essentially, it guides the flashing tool (like SP Flash Tool for MediaTek devices) on how to properly distribute and write data to the device's storage.