In GRUB2 command prompt, I am not seeing hard disk partitions like (hd0), (hd0,msdos1), Instead I am seeing (ahci4), (ahci4,msdos1).

Usually, GRUB2 will list all the drives that coreboot presents to it. I think coreboot presenting drives in "AHCI" (not in "hd) format. So that GRUB2 displaying drives in AHCI format. 

Correct me, If I am wrong. 

Is there any changes to do in menuconfig?

Can you please help me to solve this issue?.

Please provide your comments.