ptxdist menuconfig barebox
Board specific settings         ---> 
	 used RAM banks (2 banks)

vi configs/phyCARD-M-2011.07.1_PMIC/barebox-defaultenv/config
line 51:
bootargs="mem=252M console=ttymxc0,115200 video=imxfb:$display"

Rebuilt barebox
 	ptxdist clean barebox
	ptxdist targetinstall barebox