Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Altera PCI Express Development Kit: Linux DMA Driver

Hi,

I am a newbie to FPGA design and implementation. While installing the PCI express board on LINUX machine, I don't see Demo application driver for DMA read and write for LINUX (Manual talks about windows installation).

I want to generate DMA read and write in Linux box. Does anyone have pointer to a sample application, driver or sof file for the same.

Let me know if I am wrong in understanding.

Thanks in advance.

-Vineet

64 Replies

Show More
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Well, In probe function , I am getting "Could not request IRQ# 246, error -38" and its disabling the ACPI interrupts. Any help would be appreciated.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Check the bar_min_len array in the driver C file. Is each number <= to the actual BAR size of your core? I remember I had to set BAR 4 to 0 in the array, because the board example .pof doesn't define it.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    --- Quote Start ---

    Check the bar_min_len array in the driver C file. Is each number <= to the actual BAR size of your core? I remember I had to set BAR 4 to 0 in the array, because the board example .pof doesn't define it.

    --- Quote End ---

    Thanks Robb.

    Acually, I should have updated that I Fixed it I have Bar[0]-Bar[2] in my setup. I am getting DMA loopback test failed though.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Actually, it looks like the read is causing problems. EPLAST increments about 10-12 every iteration, but then freezes at 253. This is one less than 254, which is required to exit the loop that waits for the completion. The write look ok, since EPLAST = n = 254 at the last iteration. I don't know... maybe Likewise can help you better here, but I feel like it's firmware if you haven't modified the driver, other than the bar_min_len array. Are you still using 7.2? Try 9.0... the driver authors report problems depending on different Quartus compilation versions.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    --- Quote Start ---

    Actually, it looks like the read is causing problems. EPLAST increments about 10-12 every iteration, but then freezes at 253. This is one less than 254, which is required to exit the loop that waits for the completion. The write look ok, since EPLAST = n = 254 at the last iteration. I don't know... maybe Likewise can help you better here, but I feel like it's firmware if you haven't modified the driver, other than the bar_min_len array. Are you still using 7.2? Try 9.0... the driver authors report problems depending on different Quartus compilation versions.

    --- Quote End ---

    Thanks Rob. I haven't modified much except some debugging statements ( which i have disabled when collecting above log). I am using Quartus II Version 8.0 and PCIE compiler version 8.0.

    I have tried windows driver. That works fine in windows.

    Likewise: Help please.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Well I have tried with Quartus II version 8.1. It gives the same error (or log). I used 8.1 as it is specified in driver file as tested. Kindly help me to debug the problem.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Just to update: My BAR configuration is as follows:

    static const unsigned long bar_min_len[APE_BAR_NUM] =

    { 32768, 0, 256 };