User's Manual l MBa8x UM 0100 l © 2021, TQ-Systems GmbH
Page 19
3.5
Boot-Mode configuration
The Boot-Mode of the i.MX 8 is set with signals BOOT_MODE[5:0], which can be set with DIP switch SW1.
The MBa8x supports the following TQMa8x boot sources.
•
eMMC (on TQMa8x)
•
QSPI NOR flash (on TQMa8x)
•
SD card (on MBa8x)
•
Serial downloader via USB OTG
Table 8:
Boot-Mode configuration
Boot-Mode
SW1-1
(Boot-Mode0)
SW1-2
(Boot-Mode1)
SW1-3
(Boot-Mode2)
SW1-4
(Boot-Mode3)
SW1-5
(Boot-Mode4)
SW1-6
(Boot-Mode5)
Boot from eFuses
0
0
0
0
0
0
Serial Downloader (USB OTG1)
0
0
1
0
0
0
eMMC
0
0
0
1
0
0
SD card (USDHC1)
0
0
1
1
0
0
Flash / 3-byte read (not supported)
0
0
0
1
1
0
Flash / 4-byte read (not supported)
0
1
1
1
1
0
Hyperflash 1.8 V (not supported)
0
1
0
1
1
0
Note: Boot from NAND
Booting from NAND is not supported on the MBa8x.
3.6
Reset and Power Modes
RESET_IN#, IMX_ONOFF and PMIC_PWRON can be pulled to GND by push buttons.
RESET_OUT has a pull-up to V_1V8_ANA. The resulting reset signal is linked to an LED.
TQMa8x
RESET_IN#
Button
IMX_ONOFF
RESET_OUT#
System
PMIC_PWRON
Button
Button
Figure 3:
Block diagram Reset