Consider unpacking an android firmware image made for Khadas Vim using for example the C code in this post or by ‘Amlogic customization tool’.
When I use the compiled C code with an android 7.1 image, I get these files: (These are also present in ‘tmp/level1’ folder in customization tool v2.0.8 installation directory and It is not important to use which of images provided by khadas)
Excluding some minor config files here, I know each of these images are a partition in my device’s eMMC. But there is some questions about these files:
1- I know bootloader.PARTITION is the same as u-boot.bin in out folder of my android sources directory after compilation. But what are UBOOT.USB and aml_sdc_burn.UBOOT files? I guess one is used when burning image via USB tool and one for burning via SD card. But I do not have any idea what these files contain and what is the relation regarding U-boot.bin?
2- What is DDR.USB file?
You can look at the file aml_upgrade_package.conf
#This file define how pack aml_upgrade_package image
#partition images, don't need verfiy
file="u-boot.bin.usb.bl2" main_type= "USB" sub_type="DDR"
file="u-boot.bin.usb.tpl" main_type= "USB" sub_type="UBOOT"
file="u-boot.bin.sd.bin" main_type="UBOOT" sub_type="aml_sdc_burn"
file="platform.conf" main_type= "conf" sub_type="platform"
file="aml_sdc_burn.ini" main_type="ini" sub_type="aml_sdc_burn"
file="dtb.img" main_type="dtb" sub_type="meson1"
file="manifest.xml" main_type="xml" sub_type="manifest"
#partition images needed verify
#if you want download userdata image, uncomment below line
#file="userdata.img" main_type="PARTITION" sub_type="data"
file="logo.img" main_type="PARTITION" sub_type="logo"
file="boot.img" main_type="PARTITION" sub_type="boot"
file="system.img" main_type="PARTITION" sub_type="system"
file="recovery.img" main_type="PARTITION" sub_type="recovery"
file="u-boot.bin" main_type="PARTITION" sub_type="bootloader"
file="dtb.img" main_type="PARTITION" sub_type="_aml_dtb"
I had seen this file but please acknowledge that it does not give us much information about those files (The conf file more or less could be viewed just as a separation of files name and extension!)
I am just so curious why we might have more than one file for bootloader. (which is the U-boot partition burned into eMMC :
u-boot.bin in your case). I guess those two files (i.e.
u-boot.bin.usb.tpl in your case) used during burn process (either via USB or sdcard) but I am not sure.
I have no idea about DDR.USB too!
Thank you @Terry
Yes, you are right. The DDR.USB is for usb burn tool and the aml_sdc_burn.UBOOT is for sdcard burn.