HcPeriodCurrentED is read-only, but Linux writes to it anyway; silently ignore this rather than printing a warning message.
(Specifically, drivers/usb/host/ohci-hub.c:ohci_rh_resume() writes a 0, in at least kernels 2.6.25 through 2.6.39.) Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> --- LXR reference for your convenience: http://lxr.free-electrons.com/source/drivers/usb/host/ohci-hub.c#L209 I'm not sure what the consensus is for cases like this where QEMU's correct to warn about dodgy device access but a popular operating system(tm) does them anyway. Suppressing the warning seems a bit more user-friendly to the average QEMU user... hw/usb-ohci.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/hw/usb-ohci.c b/hw/usb-ohci.c index 347814e..23a5e66 100644 --- a/hw/usb-ohci.c +++ b/hw/usb-ohci.c @@ -1591,6 +1591,10 @@ static void ohci_mem_write(void *ptr, target_phys_addr_t addr, uint32_t val) ohci->hcca = val & OHCI_HCCA_MASK; break; + case 7: /* HcPeriodCurrentED */ + /* Ignore writes to this read-only register, Linux does them */ + break; + case 8: /* HcControlHeadED */ ohci->ctrl_head = val & OHCI_EDPTR_MASK; break; -- 1.7.1
