How to find the memory offset for the kernel?

Question

linux

In general, I am modifying the kernel (porting Debian to the phone)

And I need to fill in these variables

KERNEL_BOOTIMAGE_PAGE_SIZE = 4096
KERNEL_BOOTIMAGE_BASE_OFFSET = 0x00000000
KERNEL_BOOTIMAGE_KERNEL_OFFSET = 0x00008000
KERNEL_BOOTIMAGE_INITRAMFS_OFFSET = 0x01000000
KERNEL_BOOTIMAGE_SECONDIMAGE_OFFSET = 0x00f00000
KERNEL_BOOTIMAGE_TAGS_OFFSET = 0x00000100

The porting guide says:

Вы можете найти смещения, посмотрев на дерево устройств Android или проверив уже построенный boot.img

And since I'm new to this business, I don't know how to check boot.img and find out the offsets.

Can anyone please tell me how to find out the offsets for variables from the already prepared boot.img?

Thanks in advance

Answer 1

This information can be obtained from the boot.img header (the boot partition on the phone flash) with the android-unpackbootimg program.