Subject: Re: USB on MobilePro 800
To: Chris Jones <>
From: Matt Thomas <>
List: port-hpcmips
Date: 08/01/2001 11:38:47
At 04:00 PM 7/31/2001 -0600, you wrote:
>I asked about this once before, but got no response:
>What's the status of USB on the MobilePro machines?  Is there a lot of
>glue to be written, or is it simple stuff that just needs a tester?
>Is documentation lacking, or something like that?

It's lack of documentation.  Since most(all?) USB chips are PCI based
and use DMA.  However the MP800 is not PCI based.  So there must be some
glue logic somewhere.  My guess is that the USB has a 64KB shared RAM
buffer that is the limit of it's dmaable memory.  But it's hard to tell.
Now if NEC was willing to release the documentation or sources to its
WINCE USB driver for the MP800, it would go a long way to getting it

FWIW, I have a MP800 and would write the OHCI attachment for the USB if
I knew how the hardware was attached.
Matt Thomas               Internet:
3am Software Foundry      WWW URL:
Cupertino, CA             Disclaimer: I avow all knowledge of this message