magicvar breaks tftp (or ramfs)

[Eric Bénard]

Hi Sascha,

while upgrading to lastet head, I started to get "unable to handle paging 
request" when transfering file using tftp (either to nand or to ram).

On master it always fail. On 2011.12 : it works (both configured with make 
eukrea_cpuimx35_defconfig and tested on an i.MX35 board)

*** HEAD at 905f3ccbd4e074d99461bd547dad63a04a9abf42 :
barebox at Eukrea CPUIMX35:/ version

barebox 2011.12.0-00129-g905f3cc (Dec 12 2011 - 17:33:10)
barebox at Eukrea CPUIMX35:/ dhcp
phy0: Link is up - 100/Full
DHCP client bound to address 192.168.1.151
barebox at Eukrea CPUIMX35:/ tftp logo.bmp.lzo
TFTP from server 192.168.1.15 ('logo.bmp.lzo' -> 'logo.bmp.lzo')
	unable to handle paging request at address 0x87f2a919
pc : [<87f1c064>]    lr : [<87f1e298>]
sp : 876ffdfc  ip : 00000016  fp : 00000000
r10: 876fff58  r9 : 00000000  r8 : 87f2abd5
r7 : 87f30b58  r6 : 877944a8  r5 : 87794689  r4 : 00000000
r3 : 87f2a919  r2 : 87f2ec74  r1 : 00000001  r0 : 00000000
Flags: nzcv  IRQs off  FIQs off  Mode SVC_32

*** 2011.12 :
barebox at Eukrea CPUIMX35:/ version

barebox 2011.12.0 (Dec 12 2011 - 17:30:49)
barebox at Eukrea CPUIMX35:/ dhcp
phy0: Link is up - 100/Full
DHCP client bound to address 192.168.1.151
barebox at Eukrea CPUIMX35:/ tftp logo.bmp.lzo
TFTP from server 192.168.1.15 ('logo.bmp.lzo' -> 'logo.bmp.lzo')
	#

Any idea what could be wrong here ?

Thanks
Eric