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S2 switches are connected to [[ORCA_SOM | ORCA]] BOOT_MODE[3:0] pins allowing different boot modes.
[[File:ORCA_SBC-S2-boot-switch.png | 400px|thumb|center| S2 boot switches]]
where S2 switches are mapped as the following table:
{| class="wikitable"
! latexfontsize="scriptsize" | BOOT_MODE
! latexfontsize="scriptsize" | S2
! latexfontsize="scriptsize" | Note
|-
| BOOT_MODE0 || S2.1 ||
|-
| BOOT_MODE1 || S2.2 ||
|-
| BOOT_MODE2 || S2.3 ||
|-
| BOOT_MODE3 || || unused
|-
|}
{| class="wikitable"
! latexfontsize="scriptsize" | BOOT_MODE[3:0]
! latexfontsize="scriptsize" | S2[4..1]
! latexfontsize="scriptsize" | Boot sequence
! latexfontsize="scriptsize" | Notes
|-
| 0000 || OFF-OFF-OFF-OFF || Boot From Internal Fuses || Please contact sales@dave.eu for more information
|-
| 0001|| OFF-OFF-OFF-ON || USB Serial Download ||
|-
| 0010|| OFF-OFF-ON-OFF || USDHC3 || eMMC boot only, SD3 8-bit
|-
| 0011|| OFF-OFF-ON-ON || USDHC2 || SD boot only, SD2 microSD
|-
| 0100|| OFF-ON-OFF-OFF || NAND || 8-bit single device 256 page
|-
| 0101|| OFF-ON-OFF-ON || NAND || 8-bit single device 512 page
|-
| 0110|| OFF-ON-ON-OFF || QSPI || 3B read
|-
|}