jffs2 boot

Hi there.

I have problem booting jffs2 device.
I can mount, read, write an test all files on my jffs2 mtd device, but when i'm booting from it it says:

jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000000: 0x2705 instead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000004: 0x4154 instead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000000c: 0x322e instead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000010: 0x3720 instead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000014: 0x6570 instead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000018: 0x3220 instead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000001c: 0x3033 instead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000020: 0x2031 instead
......
Further such events for this erase block will not be printed
Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes empty_blocks 2, bad_blocks 0, c->nr_blocks 6

What's wrong? I've tried several mtd versions on linux-2.4.25 from denx.de