ezdma

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Transferring very large DMA buffers

2

Hi Jeremy, I'm trying to DMA very large buffers (512M byte if I can) into memory. I seem to run into a memory problem for sg_alloc_table if I try to...

McGr

dma_map_sg fails

3

I'm running your driver on an xilinx embedded linux (built w/ petalinux 2017.3) and a Zynq Ultrascale device, and when I run the speed test /loopback test, dma_map_sg returns 0...

jotorious

Any tips/advice on how to go about getting this driver to work for the xilinx zynq ultrscale+ devices?

noelpedro

Problem stopping an uncompleted read or write operation

5

Hi Jeremy, First of all, congratulations, your driver works very well!. However, I have an annoying problem if I have to stop an uncompleted DMA operation (either write or read)....

Arribas

Whats the difference between EZDMA and Xilinx's dma_proxy?? Is one better than the other? https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842418/Linux+DMA+From+User+Space Thanks

noelpedro

Was this Module added to mainline kernel?

1

Hi Jeremy was your module added to baseline kernel?

noelpedro

Kernel error with dma size of 65 KB

2

I've been using 32 KB dma transactions to reliably transfer streaming data. I can read 1 or 100,000 dma dma blocks reliable. However, when increasing the read size by a...

ericqui

module built using petalinux

7

Hi jeremy, I use petalinux v2016.3 to contain the source code of ezdma.c in my created module. Once the linux on board booted, I typed "insmod /lib/modules/'uname -r'/extra/ezdma.ko" or "modprobe...

DarrenChengdu

Use ezdma from kernel-space

4

Hi. I'm writing a DMA driver for my hardware. I don't know about parameter was set on FPGA. Your code works well in user-space. I tried you your code in...

ht-hieu

Does ezdma support contiguous memory ?

3

Hello, Taking a look in ezsdk code I see it use SG dma method. Does it mean that it does not support dma_alloc_coherent (contiguous) memory allocation ? Thank you, Ran

ranshalit