What's the difference between preloader_raw.img, preloader_ufs.img and preloader_emmc.img?

Question

I have a Xiaomi Redmi 9 phone, and in case of this device I use a custom ROM - crDroid. From time to time, I update the phone's firmware by downloading a corresponding firmware package from xiaomifirmwareupdater.com.

When you look inside the firmware package, you can see the following content:

Path = fw_lancelot_miui_LANCELOTEEAGlobal_V12.5.4.0.RJCEUXM_67a1671939_11.0.zip
Type = zip
Physical Size = 40808894
Date      Time    Attr         Size   Compressed  Name

2022-02-28 13:40:44 D....            0            0  META-INF
2022-02-28 13:40:40 .....       280488       171992  preloader_raw.img
2022-02-28 13:40:40 .....       282536       172052  preloader_ufs.img
2022-02-28 13:40:42 .....            1            3  type.txt
2022-02-28 13:40:40 .....          859          364  scatter.txt
2022-02-28 13:40:40 .....       282536       172052  preloader_emmc.img
2022-02-28 13:40:40 .....     59329408     35869684  md1img.img
2022-02-28 13:40:42 .....      2505440      2166963  tee.img
2022-02-28 13:40:42 .....        37984         7454  spmfw.img
2022-02-28 13:40:40 .....       352816       144110  scp.img
2022-02-28 13:40:42 .....       505616       483321  sspm.img
2022-02-28 13:40:24 .....      1302976       522804  lk.img
2022-02-28 13:40:22 D....            0            0  META-INF/com
2022-02-28 13:40:44 .....         1634         1144  META-INF/CERT.RSA
2022-02-28 13:40:42 .....         2217          999  META-INF/MANIFEST.MF
2022-02-28 13:40:42 .....         2270         1091  META-INF/CERT.SF
2022-02-28 13:40:42 D....            0            0  META-INF/com/android
2022-02-28 13:40:22 D....            0            0  META-INF/com/google
2022-02-28 13:40:24 D....            0            0  META-INF/com/google/android
2022-02-28 13:40:24 .....      2340536      1090127  META-INF/com/google/android/update-binary
2022-02-28 13:40:44 .....         3559          863  META-INF/com/google/android/updater-script
2022-02-28 13:40:22 .....          316          220  META-INF/com/android/metadata
2022-02-28 13:40:42 .....         1594         1077  META-INF/com/android/otacert

2022-02-28 13:40:44           67232786     40806320  18 files, 5 folders

So I have the following questions:

Will the preloader be touched in any way when I flash this zip via TWRP/SHRP recovery?
What's the difference between preloader_raw.img , preloader_ufs.img and preloader_emmc.img ?
In the fastboot ROMs there's preloader_lancelot.bin which (according to the scatter.txt file) goes to:

  partition_index: SYS0
  partition_name: preloader
  file_name: preloader_lancelot.bin
  is_download: true
  type: SV5_BL_BIN
  linear_start_addr: 0x0
  physical_start_addr: 0x0
  partition_size: 0x80000
  region: EMMC_BOOT1_BOOT2
  storage: HW_STORAGE_EMMC
  boundary_check: true
  is_reserved: false
  operation_type: BOOTLOADERS
  is_upgradable: true
  empty_boot_needed: false
  combo_partsize_check: false
  reserve: 0x00

Is this preloader_lancelot.bin file related anyhow to preloader_raw.img, preloader_ufs.img or preloader_emmc.img ?

compare checksum for files. read META-INF/com/google/android/updater-script — alecxs, Jan 29 '23 at 12:16
It looks like it depends on get_storage_type() -- I have no idea what that would be. But if true, then preloader_ufs.img is flashed to /dev/block/mmcblk0boot1 and if false then preloader_emmc.img is flashed instead. — Mikhail Morfikov, Jan 29 '23 at 16:59
It's not about the difference between the two, but how do I know which one is used? — Mikhail Morfikov, Jan 29 '23 at 19:45
with get_storage_type() probably ;) or check partitions https://android.stackexchange.com/q/240767 — alecxs, Jan 29 '23 at 20:05

What's the difference between preloader_raw.img, preloader_ufs.img and preloader_emmc.img?

0 Answers0