[U-Boot] [PATCH] usb: fix usb start problem with SMSC USB hub and Toshiba USB stick

Detlev Zundel
2010-09-22T14:50:08Z

Hi Roland,

> i`m spending more than half of this evening with this issue, trying to
> find a solution and trying to provide information for a problem
> affecting many people and which seems to exist in u-boot.

Rest assured that many people on this list spend multiple days with USB
problems :|

> so please forgive if i jumped onto the wrong thread as an entry point
> and i helter-skelter blundered into this list. will go whine elsewhere
> then and use obscure workarounds for this issue instead ( like that
> guy on this thread:
> http://openplug.org/plugforum/index.php?topic=131.0 )

The guy doing a reboot when it fails? Actually not a bad strategy. It
shows once more that USB has the tendency to be non-deterministic.

As always, it would be good to first find out if the codebase of the
U-Boot you use is comparable to mainline (otherwise we cannot use _any_
tests you do) and then do systematic tests to narrow down the problem.

It may well be that USB has been tested better in U-Boot context with
USB sticks (solid state) rather than mechainically spinning hard disks.
Maybe this is something which needs to be taken into account in the
code.

Keep us posted.

Cheers
Detlev

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