The problem of Altera-SoCFPGA-HardwareLib-Unhosted-CV-GNU！

You was choose correct direction !

And why at once modify and compile Preloader ? In .txt I see:

--- Quote Start ---

This Preloader was already compiled and it is provided with the project.

--- Quote End ---

Usually in Preloader HPS-UART is initialized with a necessary parameters and it's output is seen in UART console on host:

U-Boot SPL 2013.01.01 (Jul 07 2014 - 11:47:21...

However, the example is a little strange: I run program hello.axf as described in .txt (usual way) and stop in main(), step 2 lines, see output "Hello World!\n", then change PC in Registers window to 0x00100080 (entry point) in order to see in debugger all startup way, step a few times -- and program not run correctly ! I want certain of starting code avoids "SVC" commands.

Then I add to Makefile a commands to generate .objdump: no "SVC" in disassemble. WHY ?!! :)

...I try to boot from SD-card as described in .txt unsuccessful: using of

alt-boot-disk-util.exe -p preloader_scrubbing/preloader-mkpimage.bin -a write -d E

return error "device open failed!".