Charles Forsyth wrote:
If the initial value isn't the default
value then I'll be understanding this a whole lot better.
yes, having checked the spec again i see what you mean.
i'm not sure, then. if i have a spare moment when working on the ohci
i'll see what is in the uhci registers after a reset.
I added a debug statement to show the initial value set in the uhci
probe function under linux. This is displayed before the hcd ever
touches the registers:
uhci_hcd 0000:00:1d.0: UHCI Host Controller
uhci_hcd 0000:00:1d.0: detected 2 ports
uhci_hcd 0000:00:1d.0: uhci_check_and_reset_hc: sts = 0x0020
uhci_hcd 0000:00:1d.0: uhci_check_and_reset_hc: cmd = 0x0000
Sure enough the status register has hchalted bit set. I'm not sure
if the bios does this or the firmware on the uhci controller. I'll
submit a patch for qemu to make it more realistic (and so plan9 boots
with -usb parameter).
Most of my patches for qemu are linked here:
http://gnome.dnsalias.net/patches/
