zd1201 failure on sharp zaurus explained

zd1201 failure on sharp zaurus explained

[Pavel Machek]

Hi!

Now I found out what went wrong with zd1201 on sharp zaurus (spitz)...

Card is detected and seems to work okay, except that you don't get any
results from iwlist eth1 scan, and card generally does not do anything
involving radio.

And now I have an explanation, too:

If you plug card directly to zaurus, above is what happens.

If you plug it into the hub, hub flashes the lights and shuts down, as
if not enough power is available from the zaurus.

...which is probably the case, because if I connect external 6V power
supply to the hub, it all starts to work.

So... it is

1) hw problem: spitz power supply is not strong enough to drive zd1201

2) usb problem, probably. Should not usb core detect that card
requires too much juice and refuse to power it up?

...and the morale is, always put hub between device and the host so
that you can see the flashy leds :-).
								Pavel 
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: zd1201 failure on sharp zaurus explained

[Oliver Neukum]

Am Dienstag, 30. Mai 2006 15:20 schrieb Pavel Machek:
> 2) usb problem, probably. Should not usb core detect that card
> requires too much juice and refuse to power it up?

Does your hub correctly report whether it is plugged in?

	Regards
		Oliver

Re: zd1201 failure on sharp zaurus explained

[Pavel Machek]

On Út 30-05-06 16:11:02, Oliver Neukum wrote:
> Am Dienstag, 30. Mai 2006 15:20 schrieb Pavel Machek:
> > 2) usb problem, probably. Should not usb core detect that card
> > requires too much juice and refuse to power it up?
> 
> Does your hub correctly report whether it is plugged in?

No idea; how do I tell?

But zaurus tries to power the wlan card even if it is directly plugged
in. wlan card there comunicates with the computer but not with the
wireless part...
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html