Mt6833 Scatter File Work -

Mastering the MT6833 (Dimensity 700) Scatter File: Structure, Function, and Practical Workflow

3. Key Components of the MT6833 Scatter File

Analysis of a standard MT6833 scatter file reveals the following critical partitions:

| Partition Name | Typical Function | File Reference | Required for Boot? | | :--- | :--- | :--- | :--- | | preloader | Low-level bootloader (initializes DRAM) | preloader_mt6833.bin | Yes | | pgpt | Primary GPT (partition table) | pgpt.img | Yes | | proinfo | Production info (IMEI, MAC, serial) | proinfo.bin | No (but critical) | | lk | Little Kernel (2nd stage bootloader) | lk.bin | Yes | | boot | Linux kernel + ramdisk | boot.img | Yes | | vendor_boot | Vendor-specific boot image | vendor_boot.img | Yes | | super | Dynamic partition (system, product, vendor) | super.img | Yes | | userdata | User data partition (size varies) | userdata.img | No | | md_udc | Modem firmware (5G/4G baseband) | md1rom.img | Yes (for telephony) | | scp | Sensor Core Processor firmware | scp.img | No | | sspm | Secure System Power Management | sspm.img | Yes |

Example snippet from a scatter file:

- partition_index: 5
  partition_name: boot
  file_name: boot.img
  is_download: true
  type: NORMAL
  linear_start_addr: 0x5000000
  physical_start_addr: 0x5000000
  partition_size: 0x2000000

How Does it Work?

  1. Preparation: When you plan to flash firmware on an MT6833 device, you typically need to prepare a few things, including the firmware images (which might be in .img or .gz format) and a scatter file specifically designed for your device.

  2. Scatter File Structure: The scatter file includes lines that specify the memory address and the size of each component of the firmware. For example, it might include sections for: mt6833 scatter file work

    • preloader: A small program that initializes the hardware during the boot process.
    • boot: The kernel and initial RAM disk used to boot the device.
    • system: The main system partition where the Android OS files are stored.
    • userdata: Where user data, such as app data and settings, are stored.

  3. Using SP Flash Tool: Once you have your scatter file and firmware images, you use SP Flash Tool to select the scatter file and then start the flashing process. The tool reads the scatter file, and then writes the corresponding firmware images to the specified locations on the device.

The Scatter File Mystery

Alex had heard of scatter files but never worked with them directly. A scatter file, he knew, was essentially a text file used in the SP Flash Tool (a popular tool for flashing firmware on MediaTek devices) that contained information about the layout of the device's storage. It told the flashing tool where to place different parts of the firmware on the device's memory. How Does it Work

Curious and a bit intimidated, Alex dove into the project. He started by downloading a sample scatter file for the MT6833 chipset. The file was simple yet complex, listing various memory regions like preloader, boot, recovery, system, cache, and userdata, among others. Each region had a specific address and size, defining where on the device's storage the corresponding piece of firmware should be written.

Advanced Work: Editing a Scatter File for MT6833

Sometimes, you need to manually edit the scatter file—for example, to resize userdata, skip tee1, or change operation_type. Preparation : When you plan to flash firmware

4.2. Read-Back (Backup Process)