cpu warning?

[Rui-Xiang Guo <rxg%lavabit.com@localhost>]

Hi, all.
Is there anyone know what kind of this issue?
[...]
NetBSD 5.1_RC3 (GENERIC) #0: Sat Jun 12 20:26:01 UTC 2010
        
builds%b8.netbsd.org@localhost:/home/builds/ab/netbsd-5-1-RC3/amd64/201006130031Z-
obj/home/builds/ab/netbsd-5-1-RC3/src/sys/arch/amd64/compile/GENERIC
total memory = 991 MB
avail memory = 945 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
SMBIOS rev. 2.3 @ 0xf0000 (33 entries)
    ( )
mainbus0 (root)
cpu0 at mainbus0 apid 0: AMD 686-class, 1808MHz, id 0x20f42
cpu0: AMD PowerNow! Technology 1800 MHz
cpu0: available frequencies (Mhz): 800 1600 1800
cpu0: erratum 89 present
cpu0: WARNING: errata present, BIOS upgrade may be
cpu0: WARNING: necessary to ensure reliable operation
[...]

-rxg