Can't make use of grub-mkimage

I am trying to create portable grub mbr with grub-mkimage to chainload as bootsector from Windows, but when booting I get stuck at a black screen with a bold "GRUB" and a blinking cursor. There's no key response. My codes:

-mkimage -p=(hd0,msdos9)/boot --target=i386-pc -o core.img biosdisk minicmd part_msdos terminal ntfs ext2

boot.img test.mbr

if=core.img of=test.mbr bs=512 seek=1

I made this work once, but cant remember how. How can I make a grub mbr without Linux. I used busybox for dd.