[U-Boot] SPL Dfu update

[Michael Trimarchi]

Hi

On Wed, Oct 30, 2013 at 2:28 PM, Stefano Babic <sbabic at denx.de> wrote:
> Hi Lukasz, hi Michael,
>
> On 30/10/2013 13:58, Lukasz Majewski wrote:
>
>> In general the presented structure is correct.
>>
>> However, I've got other concerns:
>>
>> The DFU + composite + gadget + UDC driver code is large (around 24KiB
>> in binary size [1] for the TRATS).
>>
>> I'm not sure if this size would be acceptable for SPL. Of course there
>> are some spots for code base size reduction (like optimizing and often
>> hardcoding code ported from linux kernel).
>
> Apart of the fact that is possible to add DFU to SPL, I am missing which
> is the real advantage. One goal of having split U-Boot into two images
> (SPL and U-Boot) is also to get a simpler and smaller image, letting the
> main U-Boot image doing the rest (hush shell, further drivers, and so
> on). We are now trying to push features that we currently have into SPL.
> Well, why cannot we simply run U-Boot if we need a DFU update ? Which
> are the real advantages for having DFU in SPL ?
>

USB flashing (no serial, no display) only otg

Michael


> Best regards,
> Stefano Babic
>
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