[U-Boot] dfu: make data buffer size configurable

[Marek Vasut]

Dear Pantelis Antoniou,

> Heiko,
> 
> On Jun 4, 2013, at 1:31 PM, Heiko Schocher wrote:
> > Hello Pantelis,
> > 
> > Am 04.06.2013 12:08, schrieb Pantelis Antoniou:
> >> Hi Heiko,
> >> 
> >> Just thinking out loud here. Can we have an extra option that
> >> allocates the buffer dynamically based on an env variable?
> > 
> > Hmm.. also a possibility... I have here no preferences ...
> > 
> > Name: "dfu_data_buf_size" if not defined, or env invalid, use
> > default CONFIG_SYS_DFU_DATA_BUF_SIZE size?
> > 
> > But this can be done in a second step, right?
> 
> Yes, only as a second step please.

Why not do it like that right away?

btw. sorry, I'm playing dead beetle until next week :-(

Best regards,
Marek Vasut