Hi, In PCIe memory transactions, I am facing an issue.
The scenario is: Case 1: In our system, we have allocated 32 bit memory space to one of the PCI device (E1000 NIC card) during enumeration and BAR programming. When NIC card is getting used to transmit a ping packet, a local buffer is getting allocated from 32 bit main memory space. In this case, the packet is getting sent out successfully. Case 2: Now when NIC card is getting used to transmit a ping packet, if a local buffer is allocated from 64 bit main memory space. The packet failed to transmit out. Doubt 1: Would it be possible for this PCI device/NIC card (in our case) to access this 64 bit address space for sending this packet out of system? Doubt 2: If a device is allocated 32 bit Memory mapped space from 32 bit memory area, then for packet transactions, can we use 64 bit memory space? Thanks and Regards, Shaveta Resource MAP for PCI bridge and one PCI device on bus 1 is: PciBus: Resource Map for Root Bridge PciRoot(0x0) Type = Io16; Base = 0x0; Length = 0x1000; Alignment = 0xFFF Base = 0x0; Length = 0x1000; Alignment = 0xFFF; Owner = PPB [00|00|00:**] Type = Mem32; Base = 0x78000000; Length = 0x5100000; Alignment = 0x3FFFFFF Base = 0x78000000; Length = 0x4000000; Alignment = 0x3FFFFFF; Owner = PPB [00|00|00:14] Base = 0x7C000000; Length = 0x1000000; Alignment = 0xFFFFFF; Owner = PPB [00|00|00:10] Base = 0x7D000000; Length = 0x100000; Alignment = 0xFFFFF; Owner = PPB [00|00|00:**] PciBus: Resource Map for Bridge [00|00|00] Type = Io16; Base = 0x0; Length = 0x1000; Alignment = 0xFFF Base = 0x0; Length = 0x20; Alignment = 0x1F; Owner = PCI [01|00|00:18] Type = Mem32; Base = 0x78000000; Length = 0x4000000; Alignment = 0x3FFFFFF gArmPlatformTokenSpaceGuid.PcdPciMmio32Base|0x40000000 gArmPlatformTokenSpaceGuid.PcdPciMmio32Size|0x40000000 # 128M gArmPlatformTokenSpaceGuid.PcdPciMemTranslation|0x1400000000 gArmPlatformTokenSpaceGuid.PcdPciMmio64Base|0x1440000000 gArmPlatformTokenSpaceGuid.PcdPciMmio64Size|0x40000000 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
