Quote Originally Posted by pmahlknecht View Post
Ok, i managed to enable the the 64Mb of U3 without enabling U4 with sdram_init=0x0013 . Infos about the sdram configuration can be found here: http://oleg.wl500g.info/sdram.html .
I changed two chips, but router did not started, so I bought new Samsung SO-DIMM and changed U3 only, it started (I did not enable whole chip, but used original commands by Oleg from first post), then U4 chip was soldered in empty place. Router booted and everything was fine, but when I enabled U4 chip via PUTTY the connection has gone after reboot command and router never booted again.
The question is how to disable U4 chip when router does not start, maybe serial port, what soft is necessary.

Regards
Pawel