The way I did was to generate the boot update first, copy the section of Funtoo menuentry and after that you do the grub-mkconfig and paste the Funtoo entry in the end of the cfg file generated by the grub-mkconfig. Seems that boot update does not execute os-prober like grub-mkconfig.
New install, grub/grub2 cannot achieve dual-boot with Windows7
in Installation Help
Posted
The way I did was to generate the boot update first, copy the section of Funtoo menuentry and after that you do the grub-mkconfig and paste the Funtoo entry in the end of the cfg file generated by the grub-mkconfig. Seems that boot update does not execute os-prober like grub-mkconfig.