Hi All, I am working on a xilinx PCIe endpoint with DMA reference block. The DMA reference block design has 2 Scatter-Gather engines, one for each DMA channel. Channel 0 is for HostMemory -> DMA_REF FIFO transfers Channel 1 is for DMA_REF FIFO -> HostMemory transfers Each scatter-gather engine works through a linked list of Descriptors from which it generates the required DMA activity. The format of these descriptors is depicted as below: Offset @ 0x00 - LSBs of pointer to DMA data Offset @ 0x04 - MSBs of pointer to DMA data Offset @ 0x08 - Number of data bytes to be transferred. (note: only 8 byte aligned transfers supported) Offset @ 0x0C - LSBs of pointer to next Descriptor (Set this field & MSBs to zero to indicate end of descriptor list) Offset @ 0x10 - MSBs of pointer to next Descriptor Does the Linux kernel has any data structure to support the above mentioned scatter-gather descriptor? Will it be possible to use the kernel scatterlist API’s for this hardware? -- Thanks, Sekhar