Revision as of 11:29, 5 March 2006

EDAC Wiki

This is a wiki for the Linux EDAC project

What is it?

EDAC Stands for "Error Detection and Correction". The Linux EDAC project comprises of a series of Linux kernel modules, which make use of error detection facilities of computer hardware, currently hardware which detects the following errors is supported:

System RAM errors (this is the original, and most mature part of the project) - many computers support RAM EDAC, (especially for chipsets which are aimed at high-reliability applications), but RAM which has extra storage capacity ("ECC RAM") is needed for these facilities to operate
PCI bus transfer errors - the majority of PCI bridges, and peripherals support such error detection

Status

The EDAC code is expected to be in Linux Kernel version 2.6.16

History

The EDAC project was renamed from the "bluesmoke" prior to submission to the mainline Linux kernel. The Bluesmoke code was created by Thayne Harbaugh. The Linux-ECC project was EDAC's predecessor and its major inspiration. Developed by Dan Hollis and others, the Linux-ECC project is no longer maintained.

Supported Hardware

System Main Memory EDAC

Supported Memory Controllers

Please see the individual driver pages for information on supported revisions, motherboard-specific information etc.

Manufacturer	Model	EDAC Driver	Chipset Documentation	Controller Capabilities	Status
AMD	Opteron	k8		EDAC, Error Scrub, Background Scrub	Supported Development Tree
AMD	Athlon64	k8		EDAC, Error Scrub, Background Scrub	Supported Development Tree
AMD	AthlonFX	k8		EDAC, Error Scrub, Background Scrub	Supported Development Tree
AMD	760	amd76x_edac.c			Supported (Linux 2.6.16)
AMD	762	amd76x_edac.c			Supported (Linux 2.6.16)
AMD	768	amd76x_edac.c			Supported (Linux 2.6.16)
Intel	e7500				Supported (Linux 2.6.16)
Intel	e7501				Supported (Linux 2.6.16)
Intel	e7505				Supported (Linux 2.6.16)
Intel	e7520				Supported (Linux 2.6.16)
Intel	e7525				Supported (Linux 2.6.16)
Intel	82875p	i82875p_edac.c			Supported (Linux 2.6.16)
Intel	e7210				Supported (Linux 2.6.16)
Intel	82860	i82860_edac.c			Supported (Linux 2.6.16)
Radisys	82600	r82600_edac.c		EDAC, Error Scrub	Supported (Linux 2.6.16)

Customisation for your Hardware

For many chipsets and motherboards, there is no consistant relationship between the memory banks/slots as made available to the EDAC driver, and the physical labels present next to the memory module socket. You can help by working out the relationship for your hardware, and adding the info to the MemorySlotLabels page.

PCI Error Reporting

PCI Parity error reporting facilities are included in the PCI specification, and the majority of add-in cards (and chips which are capable of being included in either add-in, or on-motherboard designs) support the PCI parity error detection, and reporting functionality. Some "fake" PCI devices which are not physically connected by a PCI bus (such as e.g. some ATA host adaptors which are built-in to a motherboard chipset) typically do not include the functionality.

Error Detection Overhead

The driver currently only support error detection via polling. Polling all of the PCI devices' error status registers can be time consuming, especially on machines which have many devices. You may wish to slow the error polling rate, or disable it altogether on such systems.

Faulty Hardware

Some PCI devices (or just particular revisions of those devices) are broken with respect to PCI parity detection, and display false positives. You can check (and add to) the list of broken devices on the PCIDevicesWithBrokenParityDetection page.

Help Wanted

Please feel free to:

Improve this documentation
HowToWriteNewMemoryControllerDrivers
Test the code
Report broken hardware for the blacklists
Create memory slot entries for your hardware
Create some user-space code (e.g. scripts to go in a cron job, extensions to SNMP daemons etc. etc.)

How to use this site

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@@ Line 168: / Line 168: @@
 |}
-=== PCI Error Reporting ===
+=== Customisation for your Hardware ===
+For many chipsets and motherboards, there is no consistant relationship between the memory banks/slots as made available to the EDAC driver, and the physical labels present next to the memory module socket.  You can help by working out the relationship for your hardware, and adding the info to the [[MemorySlotLabels]] page.
+== PCI Error Reporting ==
 PCI Parity error reporting facilities are included in the PCI specification, and the majority of add-in cards (and chips which are capable of being included in either add-in, or on-motherboard designs) support the PCI parity error detection, and reporting functionality.  Some "fake" PCI devices which are not physically connected by a PCI bus (such as e.g. some ATA host adaptors which are built-in to a motherboard chipset) typically do not include the functionality.
@@ Line 188: / Line 192: @@
 * Test the code
 * Report broken hardware for the blacklists
+* Create memory slot entries for your hardware
 * Create some user-space code (e.g. scripts to go in a cron job, extensions to SNMP daemons etc. etc.)
 == Related Articles ==
+Sourceforge web page - [http://bluesmoke.sourceforge.net/]
 An overview of EDAC technologies on Wikipedia [http://en.wikipedia.org/wiki/Error_correction_and_detection]

Difference between revisions of "Main Page"