Re: ixg(4) performances

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

On Tue, Aug 26, 2014 at 11:13:50AM -0400, Christos Zoulas wrote:
> I think in the example that was 0xe6. I think the .b means byte access
> (I am guessing). 

Yes, I came to that conclusion reading pciutils sources. I discovered
they also had a man page explaining that -)

> I think that we are only doing word accesses, thus
> we probably need to read, mask modify write the byte. I have not
> verified any of that, these are guesses... Look at the pcictl source
> code.

I try writting at register 0xe4, but when reading again it is still 0. 

        if (pcibus_conf_read(fd, 5, 0, 1, 0x00e4, &val) != 0)
                err(EX_OSERR, "pcibus_conf_read failed");

        printf("reg = 0x00e4,  val = 0x%08x\n", val);

        val = (val & 0xff00ffff) | 0x002e0000;

        if (pcibus_conf_write(fd, 5, 0, 1, 0x00e4, val) != 0)
                err(EX_OSERR, "pcibus_conf_write failed");


-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost