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[212.52.62.69]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ac3149ce8efsm1138616666b.102.2025.03.20.02.41.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Mar 2025 02:41:30 -0700 (PDT) From: "=?UTF-8?Q?=C5=BDilvinas_=C5=BDaltiena?=" X-Google-Original-From: =?UTF-8?Q?=C5=BDilvinas_=C5=BDaltiena?= Message-ID: Date: Thu, 20 Mar 2025 11:38:58 +0200 Precedence: bulk X-Mailing-List: linux-edac@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: yazen.ghannam@amd.com Cc: bp@alien8.de, linux-edac@vger.kernel.org, mailinglist@reox.at References: <20250317120702.GA7066@yaz-khff2.amd.com> Subject: Re: Memory controller not showing half of the memory? Content-Language: en-US In-Reply-To: <20250317120702.GA7066@yaz-khff2.amd.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello, I am also having this "half" memory problem - EDAC is showing 48GB instead of 96GB, however otherwise whole 96GB are usable by OS. My system has: 1) AMD Ryzen 7950X3D 2) Asus B650 Pro Creator motherboard (AGESA is PI 1.2.0.3a Patch A) 3) 2x48GB ECC UDIMMs (KSM56E46BD8KM-48HM https://www.kingston.com/datasheets/KSM56E46BD8KM-48HM.pdf) Kernel 6.13.6 is showing: [    0.325894] [          T1] EDAC MC: Ver: 3.0.0 [    9.521853] [   T1336] EDAC MC0: Giving out device to module amd64_edac controller F19h_M60h: DEV 0000:00:18.3 (INTERRUPT) [    9.521856] [   T1336] EDAC amd64: F19h_M60h detected (node 0). [    9.521857] [   T1336] EDAC MC: UMC0 chip selects: [    9.521858] [   T1336] EDAC amd64: MC: 0:          0MB 1:        0MB [    9.521859] [   T1336] EDAC amd64: MC: 2: 16384MB 3:  8192MB [    9.521860] [   T1336] EDAC MC: UMC1 chip selects: [    9.521861] [   T1336] EDAC amd64: MC: 0:          0MB 1:         0MB [    9.521862] [   T1336] EDAC amd64: MC: 2: 16384MB 3:  8192MB or in summary: UMC0: MC0=0GB, MC1=0GB, MC2=16GB, MC3=8GB UMC1: MC0=0GB, MC1=0GB, MC2=16GB, MC3=8GB I also has access to different system with AMD Ryzen 7950X and 2x32GB ECC UDIMMs, and it does NOT have this half ram problem, i.e. EDAC shows in summary: UMC0: MC0=0GB, MC1=0GB, MC2=16GB, MC3=16GB UMC1: MC0=0GB, MC1=0GB, MC2=16GB, MC3=16GB RAM is Kingston KSM52E42BD8KM-32HA (https://www.kingston.com/datasheets/KSM52E42BD8KM-32HA.pdf) in it.