EPYC 3rd Gen, Resizable BAR support

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RolloZ170

Well-Known Member
Apr 24, 2016
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germany

BoGs

Active Member
Feb 18, 2019
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i can add Rebar with this method/guide
it don't add an option to the BIOS, you need a tool to enable ReBar.
MZ92-FS0 100 or A00/B00 ?
I think its A00 based on the stickers I got this EWaste for 200, and one of mem channels does not work so wondering if I can use it as offite failover.

IMG_4734.pngIMG_4733.png
 

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BoGs

Active Member
Feb 18, 2019
264
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28
Forgot to mention I also was updating the bios to latest, as well as BMC.

Screenshot 2026-09-01 at 4.57.04 PM.png
 

BoGs

Active Member
Feb 18, 2019
264
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remember you need to run ReBarState(windows,linux) to enable/adjust ReBar.
OMG that worked..... <3 You are the best!!!

Code:
01:00.0 VGA compatible controller: NVIDIA Corporation Device 2d30 (rev a1) (prog-if 00 [VGA controller])
    Subsystem: NVIDIA Corporation Device 2054
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 112
    IOMMU group: 43
    Region 0: Memory at f4000000 (32-bit, non-prefetchable) [size=64M]
    Region 1: Memory at 47c00000000 (64-bit, prefetchable) [size=16G]
    Region 3: Memory at 48012000000 (64-bit, prefetchable) [size=32M]
    Region 5: I/O ports at 4000 [size=128]
    Expansion ROM at f8000000 [disabled] [size=512K]
    Capabilities: [40] Power Management version 3
        Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold-)
        Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [48] MSI: Enable- Count=1/16 Maskable+ 64bit+
        Address: 0000000000000000  Data: 0000
        Masking: 00000000  Pending: 00000000
    Capabilities: [60] Express (v2) Legacy Endpoint, MSI 00
        DevCap:    MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, L1 unlimited
            ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+
        DevCtl:    CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
            RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+ FLReset-
            MaxPayload 256 bytes, MaxReadReq 512 bytes
        DevSta:    CorrErr+ NonFatalErr- FatalErr- UnsupReq+ AuxPwr- TransPend-
        LnkCap:    Port #0, Speed 32GT/s, Width x8, ASPM L1, Exit Latency L1 unlimited
            ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
        LnkCtl:    ASPM Disabled; RCB 64 bytes, Disabled- CommClk+
            ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
        LnkSta:    Speed 16GT/s (downgraded), Width x8 (ok)
            TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
        DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP- LTR+
             10BitTagComp+ 10BitTagReq+ OBFF Via message, ExtFmt- EETLPPrefix-
             EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
             FRS-
             AtomicOpsCap: 32bit+ 64bit+ 128bitCAS-
        DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR- OBFF Disabled,
             AtomicOpsCtl: ReqEn-
        LnkCap2: Supported Link Speeds: 2.5-32GT/s, Crosslink- Retimer+ 2Retimers+ DRS-
        LnkCtl2: Target Link Speed: 32GT/s, EnterCompliance- SpeedDis-
             Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
             Compliance De-emphasis: -6dB
        LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+ EqualizationPhase1+
             EqualizationPhase2+ EqualizationPhase3+ LinkEqualizationRequest-
             Retimer- 2Retimers- CrosslinkRes: unsupported
    Capabilities: [9c] Vendor Specific Information: Len=14 <?>
    Capabilities: [b0] MSI-X: Enable- Count=9 Masked-
        Vector table: BAR=0 offset=00b90000
        PBA: BAR=0 offset=00ba0000
    Capabilities: [100 v1] Secondary PCI Express
        LnkCtl3: LnkEquIntrruptEn- PerformEqu-
        LaneErrStat: 0
    Capabilities: [12c v1] Latency Tolerance Reporting
        Max snoop latency: 0ns
        Max no snoop latency: 0ns
    Capabilities: [134 v1] Physical Resizable BAR
        BAR 1: current size: 16GB, supported: 64MB 128MB 256MB 512MB 1GB 2GB 4GB 8GB 16GB
    Capabilities: [140 v1] Virtual Resizable BAR
        BAR 2: current size: 256MB, supported: 64MB 128MB 256MB 512MB 1GB 2GB 4GB 8GB 16GB 256TB 512TB 1PB 2PB 4PB 8PB 16PB 32PB 64PB 128PB 256PB 512PB 1EB 2EB 4EB 8EB
    Capabilities: [14c v1] Data Link Feature <?>
    Capabilities: [158 v1] Physical Layer 16.0 GT/s <?>
    Capabilities: [188 v1] Extended Capability ID 0x2a
    Capabilities: [1b8 v2] Advanced Error Reporting
        UESta:    DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
        UEMsk:    DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
        UESvrt:    DLP+ SDES+ TLP- FCP+ CmpltTO+ CmpltAbrt- UnxCmplt+ RxOF+ MalfTLP+ ECRC+ UnsupReq- ACSViol-
        CESta:    RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
        CEMsk:    RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr-
        AERCap:    First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- ECRCChkCap+ ECRCChkEn-
            MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
        HeaderLog: 00000000 00000000 00000000 00000000
    Capabilities: [200 v1] Lane Margining at the Receiver <?>
    Capabilities: [248 v1] Alternative Routing-ID Interpretation (ARI)
        ARICap:    MFVC- ACS-, Next Function: 1
        ARICtl:    MFVC- ACS-, Function Group: 0
    Capabilities: [250 v1] Single Root I/O Virtualization (SR-IOV)
        IOVCap:    Migration-, Interrupt Message Number: 000
        IOVCtl:    Enable- Migration- Interrupt- MSE- ARIHierarchy+
        IOVSta:    Migration-
        Initial VFs: 1, Total VFs: 1, Number of VFs: 0, Function Dependency Link: 00
        VF offset: 2, stride: 1, Device ID: 2d30
        Supported Page Size: 00000573, System Page Size: 00000001
        Region 0: Memory at 0000048014000000 (64-bit, prefetchable)
        Region 2: Memory at 0000048000000000 (64-bit, prefetchable)
        Region 4: Memory at 0000048010000000 (64-bit, prefetchable)
        VF Migration: offset: 00000000, BIR: 0
    Capabilities: [2a4 v1] Vendor Specific Information: ID=0001 Rev=1 Len=014 <?>
    Capabilities: [2bc v1] Power Budgeting <?>
    Capabilities: [2f4 v1] Device Serial Number d3-78-e9-54-99-2d-b0-48
    Kernel modules: nvidiafb, nouveau

Let me know where I can send you a coffee, chocolate or beer I really really really appreciate the help!
 
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