[U-Boot] Need answers of basic questions regarding u-boot

Hi, I am new to linux and u-boot. Please answer my following questions. 1) what is u-boot? why it require? 2) why we can not load linux kernel directly without use of u-boot? 3) How does any processor sequence starts when power is on? -- Thanks & Regards Rakesh

[U-Boot] New to u-boot

Hello Guys, I am new to u-boot. I want to understand the flow of u-boot. I have tried to go through start.s file, but I stop after arm_boot function call. I did not understand that how board gets configured? in older version of u-boot i can see _config option in makefile, but in newer version it