User's Manual l MBa335x UM 0202 l © 2018, TQ-Systems GmbH
Page 47
4.3.5
Boot-Mode configuration
The TQMa335x can boot from different sources:
•
eMMC (MMC1)
•
SD card (MMC0)
•
SPI NOR flash (SPI0)
Additional boot sources can be used according to the AM335x data sheet, insofar as this is possible with the respective pin
usage.
The settings
of S1 and S2 define which device is selected as primary boot source. The exact list of signals, as well as their
meaning for the boot process, is to be taken from the TQMa335x User’s Manual. Some of the signals are not relevant for boot
source selection.
The AM335x supports so-called boot sequences, i.e. if it fails to boot from the first boot device, it tries to boot from the next boot
device. See TQMa335x User’s Manual for more details. Only the primary boot source is given in Table 82.
Illustration 41:
Configuration of boot loader source with DIP switches S1 and S2
8:
Only applies to
TQMa335x
modules with unburnt eFuses.