linux-kernel - RE: [QUESTION] EDAC/igen6: Missing PCI ID for Intel "Arrow Lake-S" Host Bridge (8086:7d1a)

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Message-ID: <CY8PR11MB71343730A212569D99BFB82489C2A@CY8PR11MB7134.namprd11.prod.outlook.com>
Date: Thu, 6 Nov 2025 13:38:47 +0000
From: "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>
To: Vlad Ilie <vladflorin.ilie@...il.com>, "linux-edac@...r.kernel.org"
	<linux-edac@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Luck,
 Tony" <tony.luck@...el.com>
Subject: RE: [QUESTION] EDAC/igen6: Missing PCI ID for Intel "Arrow Lake-S"
 Host Bridge (8086:7d1a)

> From: Vlad Ilie <vladflorin.ilie@...il.com>
> Sent: Saturday, November 1, 2025 8:59 PM
> To: linux-edac@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Subject: [QUESTION] EDAC/igen6: Missing PCI ID for Intel "Arrow Lake-S" Host
> Bridge (8086:7d1a)
> 
> Hello,
> 
> I am running a system with a new Intel "Arrow Lake-S" CPU (Core Ultra
> 9 285T) on an ASRock IMB-X1317-10G motherboard, which supports In-Band
> ECC.

From [1] "ECC Memory Supported Yes", this CPU should be with Out-of-Band ECC, not In-Band ECC. 

[1] https://www.intel.com/content/www/us/en/products/sku/241059/intel-core-ultra-9-processor-285t-36m-cache-up-to-5-40-ghz/specifications.html?wapkw=%22Arrow%20Lake-S%22%20CPU%20(Core%20Ultra%209%20285T)

> 
> I have confirmed ECC is enabled in the BIOS, and dmidecode reports an 80-bit
> total width, so the hardware is active.

What are the item names of your BIOS settings for ECC?
If it's In-Band ECC, there should be "In-Band ECC", "IBECC", or similar string names. 

> 
> However, the igen6_edac driver fails to attach, and edac-util reports "No
> memory controllers found."
> 

igen6_edac is the EDAC driver for Intel client CPUs with In-Band ECC.
ie31200_edac is the EDAC driver for Intel client CPUs with Out-of-Band ECC.

> [..]