AM67A: J722SKH01EVM SW2 setting

Part Number: AM67A

Tool/software:

From am67a evm user guide.pdf, SW2 related to boot mode, but from my test result, it doesn't impact boot. for example:

eMMC boot with SW2[1:3] =000 or 110. 

SD boot with SW2[1:3] =000 or 110

either can boot to Kernel prompt. why list the table here? How it impact boot mode?