Hi Tom,

> On Mon, Sep 19, 2016 at 01:31:30PM -0400, Tom Rini wrote:
> > Introduce a hidden USB_FUNCTION_DFU Kconfig option and select it for
> > CMD_DFU (as we must have the DFU command enabled to do anything
> > DFU). Make all of the entries in drivers/dfu/Kconfig depend on
> > CMD_DFU and add options for all of the back end choices that DFU
> > can make use of.
> [snip]
> > +config DFU_MMC
> > +   bool "MMC back end for DFU"
> > +   help
> > +     This option enables using DFU to read and write to MMC
> > based storage.
> Adding:
>         If working with an underlying filesystem rather than raw
>         storage you will still need to enable the appropriate write
>         commands.
> As in doing local testing of stuff that drove me to scratch this itch
> I noticed that CMD_EXT4_WRITE is not set on sunxi.  But I don't think
> we should force fat+ext4 write to be enabled simply because DFU_MMC
> is set. I should however follow up with adding default y if DFU_MMC to
> CMD_EXT4_WRITE and migrate FAT_WRITE to Kconfig as well.


Thanks for investigation.

(It comes to me that inevitably it is the highest time to move
DFU/THor/UMS and underlying USB layers to DM and Kconfig).

Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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