Messages in this thread | | | Date | Wed, 16 Jan 2013 21:25:57 -0500 | From | Woody Suwalski <> | Subject | Re: Linux 3.8-rc1 - another regression on USB :-( |
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Alan Stern wrote: > On Tue, 15 Jan 2013, Woody Suwalski wrote: > >>> Another important change is that the EHCI driver is now split into two >>> modules. That can slow down loading and affect the timing. >>> >>> Alan Stern >>> >> My testcase is a live initramfs + squash root. >> The boot logic is as stable as can be - unchanged since 2.6.2x kernels. >> And it was working fine till 3.8-rc1. >> >> The modules are insmoded in a fixed order: >> usb-common, usbcore, xhci-hcd, ehci-hcd, uhci-hcd, ohci-hcd, usbhid, >> usb_storage,... > But apparently you don't insmod ehci-pci. That could cause problems, > if your EHCI controller is PCI-based. > >> If all USB is built as modules - I get read errors from USB drives when >> accessing squash image, boot fails. > What read errors? What is the cause of these errors? > >> If usb-common and usbcore are built in, system seems to crawl with a >> very slow USB, but boots. That could be caused by timing between hcd >> modules. > Do have a dmesg log with timestamps so we can see where things go slow? > I suggest enabling CONFIG_PRINTK_TIME and CONFIG_USB_DEBUG. You might > even want CONFIG_USB_STORAGE_DEBUG, although that often logs too much > information. > >> If usb-common, usbcore and ehci-hcd are built-in, all works OK like >> "before 3.8". > What about ehci-pci? > > Alan, it took me 2 times re-reading the email to notice... You were talking about ehci-pci, not ehci-hcd... Old assumptions die hard... Yep, that was it. Catch22 - I would have noticed new dependency if I could boot, but to boot I have had needed to notice the new dependency...
Case solved 8-)
Thanks, Woody
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