Messages in this thread | | | Date | Mon, 07 Jul 2003 09:09:31 -0700 | From | David Brownell <> | Subject | Re: [linux-usb-devel] PROBLEM: when booting from USB-HDD device kernel 2.4.21 is trying to mount root file system too early before usb device is found on the usb-bus |
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Ilia A. Petrov wrote: > David Brownell wrote: >> Ilia A. Petrov wrote: >> >>> When kernel is mounting root file system it is doing it too fast so >>> usb-support have not ime to scan bus for mass-storage devices and >>> connect them. >>> ... >>> or, imho better way, - when completing init of usb bus, first scans >>> it and connect all devices and only after all devices were connected >>> returns to main kernel code. >> >> >> >> That might not entirely solve the problem, since the relevant device >> could drop off the bus temporarily, but it seems like it'd be a step >> forward. How would you make root hub ("bus") initialization do that? > > > i'm not familiar with linux usb implementation so may be it's wrong: > after sending global reset over the bus you can manually check (not > trough the hub driver) root port connection status and call enumeration > if needed.
I had in mind an explanation that works with "patch -p1" ... :)
There's already a call to register a root hub. It'd be dangerous to have some other thread try to share responsibilities with khubd, so that call would likely need to be modified. (Although there's been a bit of discussion about actually getting rid of that specific single-point-of-failure, since not all hub operations need to be serialized.)
- Dave
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