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MBa8Mx DIP switch settings

Switching boot sources is only possible if the BOOT_MODE fuses are not programmed. If configured for “Boot from eFuses” but fuses are not programmed,
the boot loader will not be able to determine the boot source.

To enable boot device selection BOOT_MODE has to be set to “Internal Boot”. This can be done using DIP switch S9 on MBa8Mx:

Boot Mode

BOOT_MODE S9-2 S9-3
Boot from eFuses OFF OFF
Serial Downloader OFF ON
Internal Boot ON OFF

To select the desired boot medium set the DIP switches as follows.

SD card

S5 S6 S7 S8 S9 S10
DIP 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
ON
OFF

eMMC

S5 S6 S7 S8 S9 S10
DIP 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
ON
OFF

S7

DIP ON OFF
1 unused
2 unused
3 UART3/UART_SYSC
USB (X16)
UART3/UART_SYSC
Pin head (X17)
4 UART1/UART2
USB (X16)
UART1/UART2
Pin head (X17)

S8

DIP ON OFF
1 TQMa8M_SYS_RST# / BSP default OFF
2 TQMa8M_ONOFF / BSP default OFF
3 SD Signals to X8 (Micro SD Slot) SD Signals to X17
4 SPI1 Signals to X20 (MikroBus) SPI1 Signals to X34

S9

DIP ON OFF
1 EN_VCC_FAN
2 BOOT_MODE0 see Boot Mode table
3 BOOT_MODE1 see Boot Mode table
4 DSI to eDP bridge DSI to LVDS bridge
  • Last modified: 2022/08/04 15:04