Re: usb at pcmcia?

[Michael Lorenz <macallan%netbsd.org@localhost>]

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Hello,

On Jun 7, 2008, at 23:15, der Mouse wrote:

> > Does the WorkPad really have cardbus?  I recall all hpcmips machines
> > I've seen being pcmcia only.
>
> I'm actually not sure enough of the difference to be certain.

Cardbus is kind of PCI on crack - it supports stuff like DMA, 32bit  
transfers and whatnot while PCMCIA ( or rather '16bit PC-Card'  
formerly known as PCMCIA ) is 16bit and doesn't support any kind of  
DMA. 16bit cards will fit into a cardbus slot but (usually) not the  
other way around. If your card slot is 16bit only and lets you insert  
a cardbus card you won't get anything useful ( so that's probably  
what happened )

> But a couple of the cards I've tried have been marked cardbus and  
> have fit
> mechanically, just produced nothing at all by way of kernel messages.
> I thought cardbus cards were mechanically icnompatible with older
> slots, which is where I got the idea that it did cardbus.

Look at the row of connectors on the card ( as in - stare into the  
holes ). There are small plastic bumps on each side. On the right  
16bit cards have a thin bump ( about 1/4 of the connector's height,  
at the bottom ) while cardbus cards have a much bigger one ( looks  
like a little more than half the connector's height ). There are  
cards out there though which are wrongly coded as 16bit while in  
reality being cardbus.

have fun
Michael

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