Booting from TFTP with barebox

Screwface
Hi,

I'm looking at Reggie's port of Barebox for Mini210s. I'd like to boot over
TFTP with it. When I use it to TFTP the kernel, it starts to download and
at some point, it says "out of memory"

mini210:/ tftp zImage
       
[###############################################################write: O
ut of memory

If I use Pengutronix BSP for mini2440, TFTP works fine. Barebox's version
then is 2011.05.0
If I try to use barebox's last version (2014.08.0), I get the same issue :

mini2440:/ tftp zImage      
[###############################################################write: O
ut of memory

I noticed the malloc space is different between those two versions of
barebox, I don't know if it can be the root cause
PTX : Malloc space: 0x33a00000 -> 0x33e00000 (size  4 MB)
Last : malloc space: 0x31bf8000 -> 0x31ff7fff (size 4 MiB)

I'd like to understand what makes mini2440 booting fine over TFTP with PTX
BSP to be able to boot mini210s over TFTP with Reggie's barebox version.

Can somebody advise me please ?

Thank you.