Biser,
At powerup both CS0 and WAIT0 goes high and remain at that level.
We use the u-boot and kernel from the ti-sdk-am335x-evm-06.00.00.00-Linux-x86-Install. It is the current active LINUXEZSDK-AM335X (25 June 2013, v06.00). When extracted we get
u-boot: u-boot-2013.01.01-psp06.00.00.00
kernel: linux-3.2.0-psp04.06.00.11
-Frank