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grb2 can't boot my ext4 partition



i've squeeze and lenny installed and squeeze as a production system now.
Recently installed grub2 (1.98) on squeeze on the MBR of hd0.
Evereting goes well but i can't  boot lenny.
The lenny file system partitions are for /boot ext3 and all others ext4.
When i try to boot lenny i have this error message:  exit_fill_super:extents feature note enabled this filesystem, use tunefs
So can't mount /dev on /root/dev, etc.....

grub.cfg:
.../...
menuentry "Lenny, kernel 2.6.28_mm01 (on /dev/sdc6)" {
    insmod ext2
    set root='(hd2,4)'
    search --no-floppy --fs-uuid --set f26b56c1-4550-4815-b7bf-e5f114c6f9e4
    linux /vmlinuz-2.6.28 root=/dev/sdc6 rootfstype=ext4 ro quiet vga=788
    initrd /initrd.img-2.6.28
..../...

this kernel is a self-compiled with of course ext4 enabled on it and had never problems to boot before i installed grub2.

Seems ext4 not supported by grub2 ?

any help would be very appreciated.
mess-mate


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