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Question about the boot protocol

From: Sherry Zhang(BJ-RD)
Subject: Question about the boot protocol
Date: Thu, 30 Aug 2018 06:25:24 +0000

Hi all,

Recently I have learned the grub2.02 source code.

Legacy BIOS


Linux kernel Documents/x86/boot.txt :

(1)   16-bit  boot protocol

(2)   32-bit boot protocol:

(3)   64-bit boot protocol: 64-bit cpu/kernel/bootloader

Some questions about it.

Question 1: How do I check that grub2 is 16-bit, 32-bit or 64-bit?

Question 2: How do I see which boot protocol is adopted?

Question 3: What the different about efi-kernel?

Question 4: linux /boot/bzImage

The code for the protection mode was copied to 0x100000, and I found through debugging that it was the virtual address, and the physical address was 0x1000000, while the value of the bzImage header code32_start at 0x214/4  is 0x100000, is the value the physical address ?

And what the relationships between code32_start at 0x214/4 and pref_address at 0258/8?


Best regards,

Sherry Zhang

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