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Date: Sat, 24 Oct 1998 03:27:08 -0400 (EDT)
From: Thomas Valentino Crimi <tcrimi+@andrew.cmu.edu>
To: freebsd-alpha@FreeBSD.ORG
Subject: PCI mapping error
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  I am working on a driver for the DEC 21030, ZXLp-E[123] card.  I've
been stumbling on mapping and accessing it's memory.  The following is
the trial code I am using to do it;

void
tga_attach(pcici_t tag, int unit)
{
     /* lets have some fun with the card */

    vm_offset_t     va, pa;
    
    if(!pci_mem_map(tag, 0x10, &va, &pa))  {
          printf("tga: memory map failed!\n");
          return;
    }

   writel(va+ TGA_MEM_CORE, 0); /* doesn't make a difference */
   printf("location = %#lx\n", readl(va + TGA_MEM_CORE));
}

  my readl of many locations within the cardspace that I have tried
always come up 0xffffffff.  The docs that i have on the card state that
memory mapping is the only method of access.

  Now then, I've tried many variations of this code, I've called
pci_mem_dense and bwx instead of map_mem just for kicks, ran readl
through a loop through many mem locations, each turns up the same thing.
 I also inserted a similar printf right after the pci_map_mem call in
the if_de driver and found it to return a satisfatory number and can't
see what I'm doing wrong.  I've also tried many variations of variable
types for va and pa.  Can anyone shed any light on this? 

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