On 11 Aug, To: bruce_at_cran.org.uk wrote: > On 12 Aug, bruce_at_cran.org.uk wrote: > Something that you might want to also print is the value of > EOREAD4(sc, EHCI_USBSTS) > immediately before the > EOWRITE4(sc, EHCI_USBCMD, EHCI_CMD_HCRESET); > call in ehci_hcreset(). Bit 12 of this register (EHCI_STS_HCH) should > be a zero before the write to do the reset is performed. Correction, this bit should be a one before doing the reset. > Maybe > ehci_hcreset() needs to wait for that to happen (as is done in > ehci_init()), rather than just waiting a fixed amount of time. I misread the code in ehci_init(), which is waiting for a transition in the opposite direction. I don't know why, because the EHCI spec says that the 1->0 transition is immediate.Received on Sat Aug 11 2007 - 23:57:43 UTC
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