FPGA Central

i am just trying to run "hello world" form microblaze......i wrote
the software program in SDK, where i have just used xil_printf("hello
world").......

if i load the program to FPGA board form XPS it outputs fine but when
i load the program from SDK, it didn't display anything(output was
displayed on Hyper Terminal).....

another thing ...if i changed the thing inside xil_printf function and
run from XPS , i didn't get the new word that i have written inside
the printf function printed, it always prints "hello world"....(build
all is also done) ....

Is there any configuration setting that i have to made ??
or what should i do to fix this problem??

any help will be greatly appreciated!!