USB Host on a SA1111

[Kristoffer Ericson]

On Wed, 16 Dec 2009 17:51:08 +0100
Filip Zyzniewski <filip.zyzniewski at gmail.com> wrote:

> Hi,
> 
> I have found out a way to connect an USB receptacle to USB host pins on
> SA1111 inside a HP Jornada 720. The modification is described at
> http://jlime.com/mw4/index.php/Hardware_documentation_jornada700_usbhost .
> 
> Unfortunately it still doesn't work as expected - I have dumped some dmesgs
> here: http://filip.math.uni.lodz.pl/jornada/usb_host/ .
> The most interesting ones are these where kernel can retrieve proper
> identification numbers (optical mouse, card driver). But communication fails
> afterwards. Devices aren't usable.

Russell you got any clues on this? From my point of view it really should
just work. But Ive never done this myself.

> 
> Things that surprise me in these logs:
> 
> [ 1126.593375] sa1111-ohci 0400: OHCI 1.0, NO legacy support registers
> 
> I've googled dmesg dumps and usually it says "with legacy support registers".
> OHCI 1.0 seems strange (SA1111 is 1.1 compatible), but i've seen that people
> have it in their logs.
> 
> [ 1127.025533] hub 1-0:1.0: no power switching (usb 1.0)
> 
> SA1111 is able to control power switching (and I have implemented the circuitry
> doing this with a TPS2043). This probably results from detecting it as
> a 1.0 host.
> 
> 
> 
> I am posting this in hope that somebody could give me pointers about where
> to begin digging to fix this. I think hardware part is ok, because id
> numbers ARE somehow transferred. What do you think about it?
> 
> regards,
> Filip Zyzniewski
> 
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-- 
Kristoffer Ericson <kristoffer.ericson at gmail.com>