Yes, printf(), as you can see by looking at the source. The serial port
and printf() support is one of the first things that is >>configured exactly to help debug via print statements.
If it isn't working on your board, you have more fundamental problems
(hardware initialization, serial port configuration,
serial port selection, who knows???). Since we don't know anything about
your board, we cannot help further.
Hi ! Now im being able to get print on the serial console. My board is workin fine . its at91sam9261. the problem is something else. i have written a driver spi-new.c for the SPI interface using BUS 1 . now though this driver is getting compiled but its not getting executed when my board boots up . i have modified the following to u-boot source tree. 1) changed Makefile in /drivers/spi/ and added a line COBJS-$(CONFIG_ATMEL_SPI) +=spi-new.o 2) changed config file in /include/configs/at91sam9261ek.h added a line # CONFIG_ATMEL_SPI 1 though my init function is getting executed in the board file located at /board/atmel/at91sam9261ek/at91sam9261ek.c my driver code is not gettung executed when my board boots up. can anyone let me know where else to change to add a new driver in u-boot so tat ur board recognizes it. warm regards, Ravi Kulkarni.