AW: [Linux-parport] ECR Register in PCI based ECP port
shahravi20 at yahoo.com
Sun Mar 7 12:23:00 GMT 2004
Do I need to do anything before I can start seeing the parallel port registers (ECP), ie
do I need to set any bits?
--- Michael Kastner <michael.kastner at gmx.at> wrote:
> > But somehow I am not able to locate the ECR register the
> > memory space (where my PCI card is mapped)
> > I tried reading the default values from these locations, and
> > it all returns zeroes (which is not correct, it should be
> > 0x01. Then I tried writing 0x34 at the ECR (guessed)
> > location, it still does not work.
> > Any ideas whats wrong here. Do I need to do anything after
> > connecting the PCI cards such that my registers become visible.
> Hello Ravi!
> You can determine the base addresses by typing
> cat /proc/pci
> in a shell. This will give you a listing of all installed PCI devices.
> Among them you will find the parallel port card.
> It should look something like this.
> Bus 0, device 9, function 0:
> Communication controller: PCI device 9710:9805 (NetMos Technology) (rev
> IRQ 9.
> Master Capable. Latency=32.
> I/O at 0xd000 [0xd007].
> I/O at 0xb800 [0xb807].
> I/O at 0xb400 [0xb407].
> I/O at 0xb000 [0xb007].
> I/O at 0xa800 [0xa807].
> I/O at 0xa400 [0xa40f].
> The first I/O address (0xd000 in this case) is the base address for the
> standard parallel port registers (like 0x378 for LPT1) and the second one
> (0xb800) is the base address for the ECP registers (like 0x778 for LPT1).
> The ECR register here is at address 0xb802.
> However it seems like these should be the same addresses as returned by
Do you Yahoo!?
Yahoo! Search - Find what youre looking for faster
More information about the Linux-parport