Boot media (CM-i.MX27)
NAND flash
Set S301[1:4] of DEV-i.MX27/35 to 0100.
NOR flash
Set S301[1:4] of DEV-i.MX27/35 to 1010.
UART/USB
Set S301[1:4] of DEV-i.MX27/35 to 0000.
Set S301[1:4] of DEV-i.MX27/35 to 0100.
Set S301[1:4] of DEV-i.MX27/35 to 1010.
Set S301[1:4] of DEV-i.MX27/35 to 0000.