dmesg bad block detected (no replies)

While looking at dmesg saw this.....

[    6.756660] Scanning device for bad blocks
[    6.820850] Bad eraseblock 808 at 0x000006500000

The device seems to be running debian fine as of now. Should I be worried? I already have Jeff's uboot and rescue installed.

BTW How do I check the version of u-boot and rescue boot installed?