[CentOS] Strange kernel error message: EDAC GART TLB blahblah..

What does the following EDAC problem means? The
machine is a AMD 64bit box running Centos 5. It looks
like some problems aroung AMD DRAM Memory controller.
But what does it really mean b/c most of my AMD boxes
has these messages in /var/log/messages. 

 Please help.

...
Aug  1 23:29:40 ccn128 kernel: EDAC MC: Ver: 2.0.1 Jun
12 2007
Aug  1 23:29:40 ccn128 kernel: EDAC MC0: Giving out
device to k8_edac Athlon64/Opteron: DEV 0000:00:18.2
Aug  1 23:29:40 ccn128 kernel: EDAC MC1: Giving out
device to k8_edac Athlon64/Opteron: DEV 0000:00:19.2
Jul 31 04:02:12 ccn128 kernel: EDAC k8 MC0: GART TLB
errorr: transaction type(generic), cache
level(generic)
Jul 31 04:02:12 ccn128 kernel: EDAC k8 MC0: extended
error code: GART error
Jul 31 14:13:14 ccn128 kernel: EDAC k8 MC0: GART TLB
errorr: transaction type(generic), cache
level(generic)
Jul 31 14:13:14 ccn128 kernel: EDAC k8 MC0: extended
error code: GART error
...



[root at ccn128 ~]# lspci -s 0000:00:18.02
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] DRAM Controller
[root at ccn128 ~]# 



       
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