[OLPC-devel] Re: video

[Jordan Crouse]

On 28/07/06 17:31 -0500, Richard Smith wrote:
> >follow the link from the olpc linuxbios page.
> >
> >I am sorry, this is a crappy video. I will try to do a better one. Also,
> >my voice is too low.
> 
> I think your rants about how slow the USB disk fobs are may be a
> little inaccurate.
> 
> Linux has a built in 5 second delay while it "waits for the device to 
> settle"
> 
> In an upcoming product we use a custom USB stack and I've used it with
> plenty (so far 10 different mfgs) of disk fobs that are ready for use
> after a 500mS reset.

Its not the device - its the kernel stack enumeration thats the problem.
It takes time to enumerate the mass storage devices.  Why?  I have no idea,
but not a single mass storage unit I have here (and I have enough to shame
Best Buy) is available immediately after the kernel goes into user space.

> I bet there was some old usb key that was a little slow and someone
> stuck a way overkill delay in there to be safe.
> 
> Perhapas we should set that delay to 0 and see how many fobs still work.

I'm willing to bet 0.  Any takers?

Jordan

-- 
Jordan Crouse
Senior Linux Engineer
Advanced Micro Devices, Inc.
<www.amd.com/embeddedprocessors>