[U-Boot] USB DFU support into mailline.

[Lukasz Majewski]

Hi Tom,

Thank you for feedback.

> On Mon, Jun 18, 2012 at 04:12:50PM +0200, Lukasz Majewski wrote:
> > 
> > Hi Harman,
> > 
> > > > -----Original Message-----
> > > > From: Lukasz Majewski [mailto:l.majewski at samsung.com]
> > > > Sent: Monday, June 18, 2012 2:25 PM
> > > > To: Marek Vasut
> > > > Cc: u-boot at lists.denx.de; Sohanpal, Harman; Kyungmin Park
> > > > Subject: Re: [U-Boot] USB DFU support into mailline.
> > > > 
> > > > Dear All,
> > > > 
> > > > > Dear Sohanpal, Harman,
> > > > >
> > > > > > Hi,
> > > > > >
> > > > > > Referring to
> > > > > > http://elinux.org/Merge_DFU_support_into_mainline_U-Boot, it
> > > > > > seems some work is going on for adding USB DFU support in
> > > > > > the mainline for u-boot. But I could not find any code
> > > > > > already in mainline. Is there anyone working on getting USB
> > > > > > DFU support to mainline?
> > > > > >
> > > > > > I am working on USB DFU on AM335x BeagleBone, and I want
> > > > > > help get USB DFU to mainline.
> > > > >
> > > > > Try looking through the u-boot mailing list. I think someone
> > > > > tried, but it needed more work.
> > > > >
> > > > 
> > > > Dear Marek and Harman,
> > > > 
> > > > I'm currently working on the DFU support at u-boot. A
> > > > composite USB gadget with DFU support is under development.
> > > 
> > > Hi Lukasz,
> > > 
> > > Thanks for the reply.
> > > When are you planning to send these patches to mailing list?
> > Yes, of course I will send those patches to u-boot mailing list.
> > 
> > > If you can point me to some branch having your code, maybe I
> > > can also contribute to the work you have already done.
> > 
> > You can look into the early DFU patches:
> > http://article.gmane.org/gmane.comp.boot-loaders.u-boot/116197/match=dfu+initial+implementation
> > 
> > There DFU is implemented as a standalone USB gadget, but it will be
> > a part of a composite one.
> 
> Would it be fair to say that a prerequisite for using the DFU support
> you are working on would be to have the composite driver
> (drivers/usb/gadget/composite.c) 7010f5b usb:gadget:composite USB
> composite gadget support

I've stated that I'm working on a composite USB gadget, which provides
DFU function.

The composite.c code is already in u-boot mainline (SHA1: 7010f5b
usb:gadget:composite USB composite gadget support). It is a Linux
kernel's composite driver from 2.6.36 ported to u-boot (no API change).

All one needs is the UDC driver (like s3c_udc_otg or
designware_udc.c, omap_*_udc or pxa27_udc) to run composite gadget.

> working with the musb framework?

The composite gadget uses Linux kernel's API for writing composite
gadgets. I don't know if it is compatible with musb framework.

In any question, please let me know.

-- 
Best regards,

Lukasz Majewski

Samsung Poland R&D Center | Linux Platform Group