grub root with /md/data
 

Setting up raid1 for /dev/sda2 and /dev/sdb2 (actually for missing and /dev/sdb2)
on /dev/md/data succeeded, but now I have to do a
dpkg-reconfigure grub-efi-amd64
and i don't know how to specify root in the two lines:
set root=...
and the linux command line
linux root=

Help is very welcome
KlaasJan