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

[Tom Rini]

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 at 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.

> 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
> 
> 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 at 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.

-- 
Tom
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