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https://parisc.wiki.kernel.org/index.php/PCI
Elroy is a PCI-4X bus controller that support 66Mhz and 64-bit devices. Elroy is used in second generation B-, C-, J-xxxx workstations which also used Astro IO and memory controller. Elroy is also in A400/A500, L-class and N-class servers as well as some rpxxxx servers. Elroy supports DAC (Dual Address Cycle), 66Mhz operation and 64-bit data path.
https://bugzilla.redhat.com/show_bug.cgi?id=1323976
Summary: PCI: Add 64-bit MMIO support to PXB devices ... Description of problem: The calculation & merging of the PXB memory ranges already happens in 64-bit, but the entry boundaries are silently truncated to 32-bit. We also can't assign all the [pci->w64.begin, pci->w64.end - 1] range to bus 0 anymore, we need to take out the ranges used by ...
https://www.kernel.org/doc/html/latest/PCI/pci.html
While all drivers should explicitly indicate the DMA capability (e.g. 32 or 64 bit) of the PCI bus master, devices with more than 32-bit bus master capability for streaming data need the driver to “register” this capability by calling pci_set_dma_mask() with appropriate parameters.
https://forums.anandtech.com/threads/pci-memory-on-a-64-bit-operating-system-with-4gb-of-ram.133923/
Jan 22, 2008 · Someone said that the 64-bit OS would automatically remap the PCI beyond 4GB, so with 4GB of physical RAM installed, OS would not only "see" it, but "use" it as well, instead of "surrendering" it...
https://support.citrix.com/article/CTX139834
For vGPU to work in the BIOS of XenServer hosts, 64-bit Memory Mapped I/O for PCI devices is required to be disabled. Some hardware vendors name component differently. For example, 64-bit MMIO, Memory Hole for PCI MMIO, and Above 4G Decoding in PCI handling options. Reboot the server and enter System Setup (press F2).
https://rocm.github.io/ROCmPCIeFeatures.html
The AtomicsOps are initiated by the I/O device which support 32-, 64- and 128-bit operand which target address have to be naturally aligned to operation sizes. Currently ROCm use this capability as following: ... Advanced->PCIe/PCI/PnP Configuration->MMIO High Size = 256G ... Excepts form Overview of Changes to PCI Express 3.0 By Mike Jackson ...
https://gridforums.nvidia.com/default/topic/546/mmio-above-4-gb-esxi-6-0u1-vgpu/
Nov 04, 2015 · Any 64-bit OS should be able to support above the 4 GB mark providing the BIOS isn't a limiting factor. Are you running the latest BIOS level on your server? tjkreidl
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