So this PCD needs to be defined as 0x3FFFFF or may be 0x400000, then it needs to be configured to 0 for your case, right? Could the PCD be configured to other values?
According to the statement you provided, is it possible to handle the case in the device firmware? " Due to a logic error, 3F_FFFFh is misinterpreted by the device as zero length." Thanks, Star -----Original Message----- From: Meenakshi Aggarwal [mailto:[email protected]] Sent: Monday, January 8, 2018 2:26 PM To: Zeng, Star <[email protected]>; [email protected]; [email protected]; [email protected]; Dong, Eric <[email protected]> Cc: Ni, Ruiyu <[email protected]> Subject: RE: [edk2] [RFC] SATA : Implemented NXP errata A008402 Hi Star, Apologies and some correction in my last reply. As per the errata, PRDT Maximum value needs to be set to 0 only when creating a PRD entry for a maximum data transfer size. So there is no need to replace all occurrences of EFI_AHCI_MAX_DATA_PER_PRDT in file. Just need to change it where we are setting the Data length. I define it to 0x3FFFFF, as this is the actual value we are setting and this PCD need to be used only once. I know, its NXP specific patch only, and i try to made changes which will not impact any other package. Thanks, Meenakshi > -----Original Message----- > From: Meenakshi Aggarwal > Sent: Monday, January 08, 2018 11:25 AM > To: 'Zeng, Star' <[email protected]>; [email protected]; > [email protected]; [email protected]; Dong, Eric > <[email protected]> > Cc: Ni, Ruiyu <[email protected]> > Subject: RE: [edk2] [RFC] SATA : Implemented NXP errata A008402 > > Hi, > > I didn't prepare the full patch but will send in next few minutes, > > i made the very basic changes required to test Errata implementation. > > I will redefine it to 0x400000. > PcdPrdtMaxDataLength was defined to 0x3FFFFF just for testing purpose. > > Thanks, > Meenakshi > > > -----Original Message----- > > From: Zeng, Star [mailto:[email protected]] > > Sent: Monday, January 08, 2018 11:19 AM > > To: Meenakshi Aggarwal <[email protected]>; > > [email protected]; [email protected]; edk2- > > [email protected]; Dong, Eric <[email protected]> > > Cc: Ni, Ruiyu <[email protected]>; Zeng, Star <[email protected]> > > Subject: RE: [edk2] [RFC] SATA : Implemented NXP errata A008402 > > > > Do you have a full patch already? > > Why the PcdPrdtMaxDataLength is defined to 0x3FFFFF, but not 0x400000? > > > > > > Thanks, > > Star > > -----Original Message----- > > From: edk2-devel [mailto:[email protected]] On Behalf > > Of Meenakshi Aggarwal > > Sent: Monday, January 8, 2018 7:17 PM > > To: [email protected]; [email protected]; edk2- > > [email protected]; Zeng, Star <[email protected]>; Dong, Eric > > <[email protected]> > > Subject: [edk2] [RFC] SATA : Implemented NXP errata A008402 > > > > Description: > > Commands with 4 MB PRD length entries fail if PRD[DBC] is set to the > > value according to AHCI standard spec. > > Due to a logic error, 3F_FFFFh is misinterpreted by the device as > > zero length. > > > > Workaround: > > Set PRD length to 0 when creating a PRD entry for a maximum data > > transfer size of 4 MB to fix the erratum. > > > > Contributed-under: TianoCore Contribution Agreement 1.1 > > Signed-off-by: Meenakshi Aggarwal <[email protected]> > > --- > > MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c | 2 +- > > MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.inf | 1 + > > MdeModulePkg/MdeModulePkg.dec | 3 +++ > > 3 files changed, 5 insertions(+), 1 deletion(-) > > > > diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c > > b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c > > index e6de5d6..fb6dc0b 100644 > > --- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c > > +++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c > > @@ -591,7 +591,7 @@ AhciBuildCommand ( > > if (RemainedData < EFI_AHCI_MAX_DATA_PER_PRDT) { > > AhciRegisters->AhciCommandTable- > >PrdtTable[PrdtIndex].AhciPrdtDbc = (UINT32)RemainedData - 1; > > } else { > > - AhciRegisters->AhciCommandTable- > >PrdtTable[PrdtIndex].AhciPrdtDbc > > = EFI_AHCI_MAX_DATA_PER_PRDT - 1; > > + AhciRegisters->AhciCommandTable- > >PrdtTable[PrdtIndex].AhciPrdtDbc > > = PcdGet32 (PcdPrdtMaxDataLength); > > } > > > > Data64.Uint64 = (UINT64)MemAddr; diff --git > a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.inf > > b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.inf > > index 82d5f7a..8921dd5 100644 > > --- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.inf > > +++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.inf > > @@ -70,6 +70,7 @@ > > > > [Pcd] > > gEfiMdeModulePkgTokenSpaceGuid.PcdAtaSmartEnable ## > > SOMETIMES_CONSUMES > > + gEfiMdeModulePkgTokenSpaceGuid.PcdPrdtMaxDataLength > > > > # [Event] > > # EVENT_TYPE_PERIODIC_TIMER ## SOMETIMES_CONSUMES diff --git > > a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec > > index 8efad57..b2f9f2b 100644 > > --- a/MdeModulePkg/MdeModulePkg.dec > > +++ b/MdeModulePkg/MdeModulePkg.dec > > @@ -1434,6 +1434,9 @@ > > # @Prompt Console Output Row of Text Setup > > > > > gEfiMdeModulePkgTokenSpaceGuid.PcdSetupConOutRow|25|UINT32|0x40 > > 00000e > > > > + ## This PCD specifies the Maximum data length for a PRD Entry > > + > > > gEfiMdeModulePkgTokenSpaceGuid.PcdPrdtMaxDataLength|0x3FFFFF|UIN > > T32|0x4000000f > > + > > [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, > PcdsDynamicEx] > > ## UART clock frequency is for the baud rate configuration. > > # @Prompt Serial Port Clock Rate. > > -- > > 1.9.1 > > > > _______________________________________________ > > edk2-devel mailing list > > [email protected] > > > https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flis > t > > s.01.org%2Fmailman%2Flistinfo%2Fedk2- > > > devel&data=02%7C01%7Cmeenakshi.aggarwal%40nxp.com%7C9b1e2bde5b > > > 4b47746d0e08d5565b8394%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C > > > 0%7C636509873433437533&sdata=wg3Sg5SiU2MrbZSkZMlboldcXnMBKKg3jG > > yA45YZo1Q%3D&reserved=0 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
