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SAMA5D3x-EK User Guide [USER GUIDE]
11180B–ATARM–29-Oct-13
4.2.4 Boot Options
Table 4-3 lists the supported boot options
4.2.4.1 Boot Configuration
In order to use SAM-BA boot, the NAND Flash and SPI DataFlash must be deselected.
Pressing the pushbutton PB4 (CS boot disable) disconnects these two components from the system while the ROM Boot
is searching for a boot device after reset. A reset can be forced by pressing the PB1 (NRST) pushbutton. Note that PB1
and PB4 pushbuttons are located on the main board (MB).
In order to boot from SAM-BA, both PB1 and PB4 should be pressed, then PB1 released while PB4 is kept pressed until
SAM-BA boots.
Table 4-3. Boot Options
Boot Mode Boot Device Type Note
BMS OPEN Embedded ROM Boot ROM Boot followed by:
- SPI0, NPCS0
- SD/MMC MCI0, MCI1
- NAND Flash
- SPI0, NPCS1
- TWI0
- SAM-BA
®
Default boot is from
embedded ROM
BMS CLOSE NOR Flash
On-board NOR Flash
using NCS0
Boot from external NOR
Flash memory
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