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Altera_Forum's avatar
Altera_Forum
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14 years ago

Simple data transfer over PCIe for co-processing

I will briefly explain what I am trying do. I have a host PC running linux and connected to an Arria GX II over PCIe. I am trying to send some data over to the FPGA, do some processing on that ( say ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

You should be able to write a simple linux driver that will use pread() and pwrite() to read/write memory fpga memory.

Your driver read code probably need to be something like: 

static ssize_t
foo_read(struct file *fp, char *u_buf, size_t len, loff_t *offp)
{
    foo_info_t *au = fp->private_data;
    loff_t loff = *offp;
    if (loff > MAX_SIZE || loff + len > MAX_SIZE)
        return -EINVAL;
    if (copy_to_user(u_buf, au->au_base + loff, len) != 0)
        return -EFAULT;
    *offp = loff + len;
    return len;
}

Updating 'offp' lets you use hexdump etc.