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 Message-ID: <QqAM5AG00YUq0Oi0U0@andrew.cmu.edu>
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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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