1, Describe the information passed from BootLoader to kernel.
2, Describe the meaning and values of the kernel image header field.
Suggested-by: Xiaotian Wu <wuxiaotian@loongson.cn>
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>