[PATCH 1/1] uboot-pcf50633-default-curr-lim-1A.patch

Nuutti Kotivuori naked at iki.fi
Thu Feb 21 16:42:09 CET 2008

This message can safely be ignored, as the actual issue is being
handled as far as I can see - this is just about this single comment.

Andy Green wrote:
> Actually I would ship the thing pulling a fixed 500mA perfectly happily.

I've heard from multiple sources that some USB hosts burn out, if you
draw more than 100mA from them. I have not witnessed any of this first
hand, so this is still hearsay. But let's assume for the moment that
this is actually true - even if it concerns only a really small part
of any available devices.

If this is the case, would you really ship a product, which when
plugged to a USB port may harm the device it was plugged in to? Would
you put a warning sticker somewhere about it? What would you do when
the customers would complain about a device harmed by OpenMoko? What
do you think the USB-IF would do hearing there's a device carrying the
USB label and still doing this?

It would be interesting to hear the answers to this.

(As an aside, there are devices doing things like this. For example,
there's an MP3 player which removes the need for a specific USB
connector by reusing the mini-plug for headphones for USB as
well. They ship a cable that has the USB-A connector on the other side
and a mini-plug on the other. Now, this cable can be used to plug the
USB power in to other devices as well, ones which are not equipped to
handle USB via mini-plug, possibly harming them. IIRC, USB-IF didn't
like them very much.)

-- Naked

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