Sheevaplug: Timing (?) problems since kernel 3.12

[Markus Krebs <mk@drkrebs.de>]

Hello,

I've been using a Sheevaplug with an USB-Stick for storage as a server 
for many years now.
Since kernel 3.12 (i. e. when dtb was introduced) I'm experiencing 
various erratic problems when transferring files over the network. For 
example unison (over ssh) is complaining about "Corrupted MAC on input"; 
or when I'm trying to read a file over the network, Windows sometimes 
states that the file is corrupt (which is not the case).

I guess those are timing problems, because when I change back to kernel 
3.11 (I kept the related uImage and uInitrd), everything is fine again.
Could this problem be caused by a change in the network driver or in the 
USB mass storage driver? Could anybody point me in the right direction 
how to solve it?

When I use recent kernels from xilka.com, the problem persists, so I 
guess the problem is not Debian-related, but the solution must be found 
upstream(?).