[U-Boot] ppc4xx:DDR SDRAM test

[Tim Rachman]

Dear ALL

I ported u-boot-2009-11  to my custom board using ppc440EP processor. I changed 
amcc/bamboo BSP to run u-boot on my board. 

I have some Questions and any suggestion can help me:
	1. Is mtest command is sufficient for DDR SDRAM testing?
	2. what is data cache status in mtest?
	3. for DDR SDRAM full test, I wrote a function to generate random data and 
address test patterns, using random()function in stdlib.h but there is a 
compilation error " stdlib.h: No such file or directory"
 when stdlib.h is included in bamboo.c

Thank for your consideration!