Specifies the storage region being targeted, such as EMMC_BOOT_1 or EMMC_USER . The Role of eMMC in MT6577 Devices
When you are working to flash, unbrick, or root an MT6577 device, the scatter file is your holy grail. Following the correct procedures ensures the flashing process goes smoothly:
A typical MT6577_Android_scatter_emmc.txt contains detailed blocks of data for each partition: mt6577 android scatter emmctxt better
Newer versions of SP Flash Tool (v5.x) look for this flag. A better scatter file explicitly defines: memory_device: 1 (for eMMC) or memory_device: 2 (for NAND). If you use an old NAND scatter file on an eMMC board, you will hard-brick the device.
eMMC storage was a major upgrade for MT6577 devices, bringing the memory controller directly onto the storage chip itself. This meant the CPU no longer had to manage the tedious tasks of error correction (ECC) or bad block management. eMMC Partitioning and the Scatter File Specifies the storage region being targeted, such as
| Partition | Typical Size | Function | |-----------|--------------|-----------| | PRELOADER | 256KB | Bootloader stage 1 | | MBR | 512B | Master Boot Record | | EBR1 | 512B | Extended Boot Record | | PRO_INFO | 3MB | Production info | | NVRAM | 5MB | IMEI, WiFi MAC, BT address | | PROTECT_F | 8MB | Factory reset protection | | PROTECT_S | 8MB | Backup protection | | SEC_RO | 10MB | Secure ROM | | UBOTA | 6MB | Boot logo splash | | ANDROID | ~600MB | System image | | CACHE | ~200MB | System cache | | USRDATA | ~1.2GB+ | User data |
For the MT6577 platform, you will see two main types of memory configurations: A better scatter file explicitly defines: memory_device: 1
You will need:
eMMC on MT6577 typically starts at 0x0 for PRELOADER. But some custom ROMs shift the start address.
The beauty of the scatter file is its human-readable format. It lists every partition on your device, its starting address, and its size. A typical MT6577 scatter file structure looks like this: