[GLSDK] Two stage u-boot design, why?

Dear Champs,

I understand some SoCs (like DM8148 and AM335x) have only 128KB on-chip memory so the two stage u-boot design is necessary.

http://processors.wiki.ti.com/index.php/DM814x_AM387x_PSP_U-Boot#Two_stage_U-Boot_design

But for J6/TDA2x, the on-chip memory has been increased to 512KB. Why GLSDK still use the two stage u-boot design?

Best Regards,

Luke Lin