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

["Ilia A. Petrov" <masmas@mcst.ru>]

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.

another way- add an option to kernel for booting from usb mass-storage, 
where place an input-waiting code, because my current solution adds such 
delay for all boots (ide,scsi,usb)