[U-Boot] SPL Dfu update

[Michael Trimarchi]

Hi

On Wed, Oct 30, 2013 at 3:32 PM, Eric Nelson
<eric.nelson at boundarydevices.com> wrote:
> On 10/30/2013 07:24 AM, Stefano Babic wrote:
>>
>> Hi Otavio,
>>
>> On 30/10/2013 15:19, Otavio Salvador wrote:
>>
>>>> OMAP4/3 can boot over the otg, so you can send MLO and let it wait for
>>>> the
>>>> second stage boot. We have already SPL USBETH in u-boot but in
>>>> production
>>>> otg flashing can be very useful. Think SPL as a differently configured
>>>> U-BOOT
>>>> doesn't change the problem but yes it's a nice idea.
>>>
>>>
>>> But you'd usually want to have an 'upgrade mode' which allows DFU to
>>> run. In this case, this could be done using complete U-Boot instead of
>>> SPL, no? In case customer needs a slim version of it, it could be
>>> accomplished using a specific config and having:
>>>
>>> SPL
>>> Update mode U-Boot (normal U-Boot with less features)
>>> Complete U-Boot (interactive and like)
>>>
>>> or am I missing something?
>>
>>
>>
>> Right, I agree completely with you.
>>
>> That's the reason I do not understand why we have to push DFU into SPL.
>> Maybe we both are missing something.
>>
>
> If I understand Tom's comment, I think the question surrounds
> a "bare metal" use case, when a full U-Boot isn't available in
> the normal place.
>
> In the case of our i.MX boards that boot to SPI-NOR, it would be
> nice to simply load an SPL image over the i.MX downloader
> and have immediate access to DFU so we can use it to
> program the SPI-NOR.
>

This should be a more complete example (just compile in my platform)

http://pastebin.ca/2472734

Michael

> Regards,
>
>
> Eric