6. auto boot If you want u-boot to start linux automatically, add this line,
#define CONFIG_BOOTDELAY 5
7. if you have more than one uart or timer in system, they will be unified to the same name by sopc-create-config-files. It will cause compilation error. Please rename the unused one in my_nios2_fpga.h. The example design of Altera dev boards come with nios2eds have such issue in two timers.