Required options - dpopchev/howto-quick-setup-gentoo GitHub Wiki
Handbook
grep -Pi gentoo /usr/src/linux/.config # Gentoo specific options
grep -Pi devtmpfs !$ # file system to mount /dev
grep -Pi scsi !$ # scsi support critical for booting
grep -Pi ext4 !$ # ext4 file system, it should also handle ext2 and ext3
grep -Pi proc_fs !$ # /proc file system support
grep -Pi tmpfs !$ # virtual memory
grep -Pi smp !$ # symmetric processing support for multi core
grep -Pi 'hid_generic|usb_hid|usb_support|hci_hcd' !$ # usb input devices and ports
grep -Pi ia32_emulation !$ # 32bit programs support unless no-multilib build
grep -Pi amd !$ # clear up amd things if intel is used
grep -Pi 'partition_advanced|efi_partition' !$ # gpt partition label support
grep -Pi _EFI_ !$ # enable efi variables when UEFI used