[U-Boot] regarding RAM Test

[Beagle Board]

Hi all,

I wanted to perform a RAM test in u-boot for my DM8148 board. I've used the
"*mtest*" command present in u-boot.
But its taking ages and it looks like a never ending test.

So guys can anyone point me a way to test maximum RAM memory.
Here why i'm asking maximum is if I try it from kernel level then some
amount of RAM will be used up by kernel as well as other applications.

Any thoughts in this regard will be of great help.