Re: [9front] BUG: thinclient not booting with usbehci,usbohci

[cinap_lenrek@felloff.net]

interesting.

one thing that could cause this might be that the firmware
has still control over the usb controllers for ps2 emulation.

a while ago, our pci startup code now clears the busmaster
enable of all pci devices on boot. i wonder if this causes
the problems later on when we do the handoff.

you can try commenting out the call to pcireset() in
/sys/src/9/pc/pcipc.c in the pcicfginit() function?

	if(pciroot == nil)
		goto out;

-	pcireset();
+	// pcireset();

	if(nobios) {

we might also try making sure we clear interrupt enables
and interrupt status bits in ehci and ohci reset()
functions. it is possible that firmware has some
pending interrupts which are somehow left enabled
and not cleared by the controller reset.

for usbohci.c, that would be adding the following lines
to ohcireset() function:

	delay(100);
+	ctlr->ohci->intrdisable = Mie;
+	ctlr->ohci->intrenable = 0;
+	ctlr->ohci->intrsts = ctlr->ohci->intrsts & ~Mie;
	ctlr->ohci->control = 0;

and for usbehcipc.c, in ehcireset() function:

	/* reclaim from bios */
	getehci(ctlr);

+	/* disable interrupts */
+	opio->intr = 0;
+	opio->sts = opio->sts & Sintrs;

	/*
	 * halt and route ports to companion controllers
	 * until we are setup
	 */
	ehcirun(ctlr, 0);

also it would be nice if we could narrow it down to
eigther ohci or the ehci controllers.

--
cinap