[U-Boot] [PATCH] A20-OLinuXino-Lime2: Enable USB gadget support

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 19-09-16 17:00, Tom Rini wrote:
> On Mon, Sep 19, 2016 at 04:53:04PM +0200, Hans de Goede wrote:
>> Hi,
>>
>> On 19-09-16 16:03, Tom Rini wrote:
>>> Based on A13-OLinuXino, enable DFU and UMS support.
>>>
>>> Signed-off-by: Tom Rini <trini@konsulko.com>
>>> ---
>>> With this change I've added DFU to my tests on this board, and assuming a
>>> follow up test with the SD image that kicks the board into FEL works, I'll
>>> then enable the UMS tests on this board (and add DFU to SD, not just DFU to
>>> RAM).
>>>
>>> configs/A20-OLinuXino-Lime2_defconfig | 8 ++++++++
>>> 1 file changed, 8 insertions(+)
>>>
>>> diff --git a/configs/A20-OLinuXino-Lime2_defconfig b/configs/A20-OLinuXino-Lime2_defconfig
>>> index 23db07380624..54343de7f351 100644
>>> --- a/configs/A20-OLinuXino-Lime2_defconfig
>>> +++ b/configs/A20-OLinuXino-Lime2_defconfig
>>> @@ -12,9 +12,17 @@ CONFIG_SYS_EXTRA_OPTIONS="SUNXI_GMAC,RGMII,AHCI,SATAPWR=SUNXI_GPC(3)"
>>> CONFIG_SPL=y
>>> # CONFIG_CMD_IMLS is not set
>>> # CONFIG_CMD_FLASH is not set
>>> +CONFIG_CMD_DFU=y
>>> +CONFIG_CMD_USB_MASS_STORAGE=y
>>
>> Do you need CMD_USB_MASS_STORAGE for your tests ? Enabling
>> CMD_USB_MASS_STORAGE really seems orthogonal to enabling GADGET
>> mode to me, esp. since it is only useful in host mode AFAICT.
>
> Ah, no, things have bad names perhaps.  CMD_USB_MASS_STORAGE enables
> "ums" as a command which is what in turn will export MMC (or something
> else) as a USB mass storage gadget over to the host.

Ah, I thought this enabled the (destructive) low level usb mass storage
block read/write test commands, but I guess I'm wrong.

I wonder why Chen-Yu put it in the usb host enabling patch for
an A33 board then...


>> Chen-Yu did something similar in a patch enabling host mode for a
>> different sunxi board and here is what I replied:
>>
>> "
>> If we want to enable CONFIG_CMD_USB_MASS_STORAGE on sunxi, we really
>> should do so on all boards (feel free to submit a patch for this).
>>
>> e.g. add something like this to board/sunxi/Kconfig:
>>
>> config CMD_USB_MASS_STORAGE
>>     default y

Given the above, that should probably be:

config CMD_USB_MASS_STORAGE
        default y if USB_GADGET


Hmm, I guess we may want to have a bunch of those, so that
simply adding:

CONFIG_USB_MUSB_GADGET=y

To a defconfig enables the relevant related options...

Regards,

Hans



>>
>> So that we can still disable it in case there are space constraints,
>> but normally we enable it on all sunxi boards offering a
>> consistent set of available commands.
>> "
>
> I think it's a useful command that should be more widely exposed, yes.
> IIRC, it's how the Tegra platforms support flashing their dev boards
> with official images, and can be a handy "rescue" type option too.
>
>>
>> The same goes for this patch, otherwise this patch is:
>>
>> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
>>
>> Ig you want to feel free to apply this directly
>> (given that I've send out a sunxi pull-req recently).
>
> OK, thanks.  I just might since I really want to move on to grabbing
> some fs patches and before I do that I really want to have as much
> testing of them as possible.
>