In order to boot the phyCORE-i.MX 91/93 development kit into Linux, it must load valid software from a memory storage device. It is typical for production systems to boot software from an onboard (non-removable) memory storage device such as eMMC memory but booting from an SD Card is more convenient during development. The phyCORE-i.MX 91/93 development kit is configured to boot from an SD Card by default.