the rootcause of the grub2 that can support USB keyboard

[Sherry Zhang(BJ-RD)]

Hi all,

 

Rencently, I have learned the GRUB2. And I have a question about it.

 

The first  experiment:

 

Platform: i386-pc

Sata : MBR format

 

I have read the grub-2.02 source code and I find the core.img including the modules : ext2 part_msdos biosdisk

I delete the grub.cfg in the “/boot/grub/grub/cfg”,so the system will enter the command-line of the grub.

So the grub only has modules as followings:

Name           Ref    count              Dependencies

Minicmd          1

Normal           1                       buf io,gettext,terminal,crypto,extcmd,boot

Gzio             0

Bufio             1

Gettext           1

Terminal                 2

Crypto            2

Extcmd           2

Boot             2

Biosdisk                  1

Part_msdos               1

Ext2              1                        fshelp

Fshelp            2

 

But I have found the USB keyboard module-usb_keyboard.mod that I don‘t load ,

So why the usb keyboard can be used when I don’t load usb modules?

 

Best regards,

Sherry Zhang

 

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