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

[Heiko Schocher <hs@denx.de>]

Hello Marek,

Am 12.06.2013 10:36, schrieb Marek Vasut:
> Dear Tom Rini,
> 
>> On Mon, Jun 10, 2013 at 09:05:48AM +0200, Wolfgang Denk wrote:
>>> Dear Heiko Schocher,
>>>
>>> In message <51B555D7.5010001@denx.de> you wrote:
>>>> Ok, I can change this. Envvar name "dfu_data_buf_size" is ok?
>>>
>>> Such long names are a paint to type. As we can't buffer anything else
>>> but data, we should be able to omit this, i. e. what about
>>>
>>> 	dfu_bufsiz
>>>
>>> ["bufsiz" as used for example as BUFSIZ in C89 stdio.h]
>>
>> Works for me.
> 
> WFM, but I need to read the discussion around here. I just stopped playing dead 
> beetle. Actually, I'm trying to find out why such a variable is needed at all. 
> Can the buffer not be allocated dynamically (and thus dependant only on malloc 
> area size)?
> 
> Please ignore this if it's been answered in one of the emails I didn't read yet.

posted a v2 for this here:

http://patchwork.ozlabs.org/patch/250665/

which allocates the buffer in the malloc area, dependend on
the environemnt variable "dfu_bufsiz".

A reason why we should have at last a config option see here:
http://lists.denx.de/pipermail/u-boot/2013-June/155924.html

bye,
Heiko
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