Under development,you maybe required set long loader command and kernel boot argument.In this kind of case, we should increase the CFG_CBSIZE in your uboot 's board's config.h.
Then modify kernel's COMMAND_LINE_SIZE value, suggest set same value for these 2 defiene Macro.
COMMAND_LINE_SIZE most under /kernel source/include/asm-xxx/setup.h
here xxx could be replace by mips,arm,ppc ....etc.
