Emmctxt Link - Mt6577 Android Scatter

The scatter file (MT6577_Android_scatter.txt) is a plain-text configuration file that tells SP Flash Tool (the official MTK flashing utility) exactly where to write each partition: Preloader, MBR, EBR1, UBOOT, BOOTIMG, RECOVERY, SEC_RO, LOGO, ANDROID, CACHE, USRDATA, etc.

Without a correct scatter file, SP Flash Tool cannot communicate with the device’s eMMC memory map.

- partition_index: SYS5
  partition_name: ANDROID
  file_name: system.img
  is_download: true
  type: YAFFS_IMG
  linear_start_addr: 0x3480000
  physical_start_addr: 0x3480000
  partition_size: 0x5300000
  region: EMMC_USER
  storage: HW_STORAGE_EMMC
  boundary_check: true
  is_reserved: false
  operation_type: update
  reserve: 0x00

Save as mt6577_scatter_parser.py:

#!/usr/bin/env python3
"""
MT6577 Android Scatter File Parser for eMMC
Supports legacy Mediatek scatter format (eMMC variant)
"""
import re
import sys
from typing import Dict, List, Optional
class MT6577ScatterParser:
def init(self, scatter_path: str):
self.scatter_path = scatter_path
self.partitions = []
self.emmc_layout = 
"EMMC_BOOT_1": [],
"EMMC_BOOT_2": [],
"EMMC_USER": []
 mt6577 android scatter emmctxt link
def parse(self) -> bool:
    """Parse MT6577 scatter file"""
    try:
        with open(self.scatter_path, 'r', encoding='utf-8', errors='ignore') as f:
            content = f.read()
    except FileNotFoundError:
        print(f"Error: Scatter file 'self.scatter_path' not found")
        return False
# Split into partition blocks
    blocks = re.split(r'- partition_index:', content)
for block in blocks[1:]:  # skip first empty
        part = self._parse_partition_block(block)
        if part:
            self.partitions.append(part)
            region = part.get('region', 'EMMC_USER')
            if region in self.emmc_layout:
                self.emmc_layout[region].append(part)
            else:
                self.emmc_layout.setdefault(region, []).append(part)
return len(self.partitions) > 0
def _parse_partition_block(self, block: str) -> Optional[Dict]:
    """Parse single partition block"""
    patterns = 
        'partition_name': r'partition_name:\s*(\S+)',
        'file_name': r'file_name:\s*(\S+)',
        'is_download': r'is_download:\s*(\S+)',
        'type': r'type:\s*(\S+)',
        'linear_start_addr': r'linear_start_addr:\s*([0-9a-fA-Fx]+)',
        'physical_start_addr': r'physical_start_addr:\s*([0-9a-fA-Fx]+)',
        'partition_size': r'partition_size:\s*([0-9a-fA-Fx]+)',
        'region': r'region:\s*(\S+)',
        'storage': r'storage:\s*(\S+)',
        'operation_type': r'operation_type:\s*(\S+)'
part = {}
    for key, pattern in patterns.items():
        match = re.search(pattern, block, re.IGNORECASE)
        if match:
            value = match.group(1)
            if key in ['linear_start_addr', 'physical_start_addr', 'partition_size']:
                # Convert hex string to int
                value = int(value, 16)
            part[key] = value
return part if 'partition_name' in part else None
def display_layout(self):
    """Display eMMC region layout"""
    print(f"\n'='*60")
    print(f"MT6577 eMMC Layout from: self.scatter_path")
    print(f"'='*60")
for region in ['EMMC_BOOT_1', 'EMMC_BOOT_2', 'EMMC_USER']:
        parts = self.emmc_layout.get(region, [])
        if not parts:
            continue
print(f"\n[ region ]")
        print(f"'Partition':<20 'Size (bytes)':<15 'Start Addr':<12 'Download':<8")
        print("-" * 60)
for p in parts:
            size = p.get('partition_size', 0)
            start = p.get('linear_start_addr', 0)
            dl = p.get('is_download', 'false')
            print(f"p['partition_name']:<20 size:<15 0xstart:08x  dl:<8")
def export_to_table(self) -> str:
    """Export as markdown table"""
    lines = ["| Partition | Region | Size | Start Address | Download |"]
    lines.append("|-----------|--------|------|---------------|----------|")
for p in self.partitions:
        name = p.get('partition_name', '?')
        region = p.get('region', 'EMMC_USER')
        size = f"0xp.get('partition_size', 0):x"
        start = f"0xp.get('linear_start_addr', 0):x"
        dl = p.get('is_download', 'false')
        lines.append(f"| name | region | size | start | dl |")
return "\n".join(lines)
def validate_integrity(self) -> List[str]:
    """Check for overlapping partitions or gaps"""
    warnings = []
    sorted_parts = sorted(self.partitions, key=lambda x: x.get('linear_start_addr', 0))
prev_end = 0
    for p in sorted_parts:
        start = p.get('linear_start_addr', 0)
        size = p.get('partition_size', 0)
        end = start + size
if start < prev_end:
            warnings.append(f"Overlap: p['partition_name'] starts at 0xstart:x, previous ends at 0xprev_end:x")
        prev_end = end
return warnings

In the world of Android firmware flashing, few tools are as misunderstood yet crucial as the scatter file. For legacy MediaTek (MTK) devices—specifically the MT6577 chipset—the relationship between the android scatter.txt and the emmc.txt file (often referred to as the EMMC link) is the difference between a successful unbricking operation and a dead device.
If you are holding an old Android smartphone powered by the dual-core MT6577 SoC (popular around 2012–2014), you’ve likely encountered the dreaded “PMT changed for the ROM” or “status_preloader” error in SP Flash Tool. The solution lies in understanding the EMMC_TXT link. The scatter file ( MT6577_Android_scatter
This article dissects what the MT6577 scatter file is, why the emmc.txt file acts as a structural link, and how to source or generate the correct configuration for your device.

(Note: this is a conceptual example — do not use these addresses without confirming for your specific device.) Save as  mt6577_scatter_parser
- partition_index: 0
  partition_name: PRELOADER
  file_name: preloader.bin
  is_download: 1
  type: RAW
  linear_start_addr: 0x00000000
  physical_start_addr: 0x00000000
  partition_size: 0x00020000
- partition_index: 7
  partition_name: ANDROID
  file_name: system.img
  is_download: 1
  type: NORMAL
  linear_start_addr: 0x01000000
  physical_start_addr: 0x01000000
  partition_size: 0x20000000