The issue is that at the amdk8 northbridge, we need to know bus/dev/fn for
the hardware so we can set up the VGA_EN bit in the right PCIIO pair as
well as an MMIO entry for it. It's not enough to just set a bit in the
bridge on the K8 -- you have to set up routing to the right Hypertransport
bus. You have to know where the device is.
By far the easiest way to do this is to add a simple structure member to
the bus structure:
struct device *vgadev;
so we have:
struct bus {
device_t dev; /* This bridge device */
device_t children; /* devices behind this bridge */
unsigned bridge_ctrl; /* Bridge control register */
/* NEW */
struct device *vgadev; /* if bridge_ctl has
* PCI_CB_BRIDGE_CTL_VGA set,
* this contains pointer to
* the device.
*/
/* END NEW */
unsigned char link; /* The index of this link */
unsigned char secondary; /* secondary bus number */
unsigned char subordinate; /* max subordinate bus number */
unsigned char cap; /* PCi capability offset */
};
Setting vgadev is then trivial in the allocate_vga_resource since in that
function you already have a pointer to the vga device; or just set the
pointer. Either way, when you are at a bridge and know that the bridge has
vga on the bus somewhere, you can easily get the info you need to set up
the bridge if it is a complex bridge like the K8.
while(bus) {
bus->bridge_ctrl |= PCI_BRIDGE_CTL_VGA;
/* NEW */
bus->vgadev = vga;
/* END NEW */
bus = (bus == bus->dev->bus)? 0 : bus->dev->bus;
}
Unless there is a huge problem with this I will try to get it done
tomorrow. It's a new structure member and one line of code and we're on
the air.
It is not totally general but ... VGA is "special". As in, really ugly.
ron
_______________________________________________
Linuxbios mailing list
[EMAIL PROTECTED]
http://www.clustermatic.org/mailman/listinfo/linuxbios
