linux-kernel - Re: USB Ethernet gadget on Nokia n900

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Message-Id: <201410192300.20625@pali>
Date:	Sun, 19 Oct 2014 23:00:20 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	sre@...ian.org, sre@...g0.de,
	kernel list <linux-kernel@...r.kernel.org>, balbi@...com,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org
Subject: Re: USB Ethernet gadget on Nokia n900

On Sunday 19 October 2014 22:50:36 Pavel Machek wrote:
> On Sun 2014-10-19 16:58:45, Pali Rohár wrote:
> > On Sunday 19 October 2014 12:07:39 Pavel Machek wrote:
> > > On Sun 2014-10-19 11:01:07, Pavel Machek wrote:
> > > > Hi!
> > > > 
> > > > From 3.6 to 3.10, USB networking works on Nokia N900.
> > > > With 3.11, it fails with messages on the host. I also
> > > > tried to get it to work on 3.14 and 3.17, with no luck.
> > > > 
> > > > Any ideas? Does it work for you? Any config options to
> > > > watch for?
> > > 
> > > With 3.17, I get
> > > 
> > > omap_musb_mailbox: musb core is not yet ready
> > > 
> > > message. It looks related...?
> > 
> > Can you try tree
> > https://gitorious.org/linux-n900/linux-n900/ ?
> > 
> > I think with rx51_defconfig from above tree it worked fine
> > for 3.10 - 3.13 versions.
> 
> From your tree, I am trying
> 815039686baffff6432b45028dd405b1981a9112 (3.16 based). I
> attempted to make gadget drivers build-in and enabled
> nfsroot. I could not detect nokia on USB after bootup.
> 
> Are you sure about defconfig? AFAICT defconfig will always be
> unsuitable for nfsroot, as it will not contain nfs support
> built-in...
> 
> I am trying c089e5f8ba2d44afd2db2c2042d43ca70205c536 (3.13
> based). Same result :-(.
> 
> Do you have any tree where usb gadget works for you?
> 
> Thanks,
> 									Pavel

My N900 can boot kernel from v3.12-rc5-n900 branch compiled with 
arch/arm/configs/rx51_defconfig. Also it can boot full Maemo5 
system (with CSSU and some minor system changes) and usb network 
via g_nokia.ko gadget working fine...

So if it does not working for you then kernel usb subsystem could 
have problems with using gadgets directly from zimage.

-- 
Pali Rohár
pali.rohar@...il.com

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