Dave Embedded Systems Axel ULite, Руководство по оборудованию

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AXEL ULite Hardware Manual v.1.0.2
7.3.1.2 NAND / SD option
Not available on actual AxelULite SOM.
BOOT_MODE0 0 1 or floating
Primary boot
device
Fallback
Tab. 21 : NAND / SD option
7.4 Clock scheme
This section will be completed in a future version of this manual.
7.5 Recovery
For different reason, starting from image corruption due power loss
during upgrade or unrecoverable bug while developing a new U-Boot
feature, the user will need, sooner or later, to recover (bare-metal restore)
the
AXEL ULite SOM without using the bootloader itself. The following
paragraphs introduce the available options.
For further information, please refer to DAVE Embedded Systems
Developers Wiki or contact the Technical Support Team.
7.5.1 JTAG Recovery
JTAG recovery, though very useful (especially in development or
production environment), requires dedicated hardware and software
tools.
AXEL ULite provides an internal connector for the JTAG interface,
which, besides the debug purpose, can be used for programming and
recovery operations.
For further information on how to use the JTAG interface, please contact
the Technical Support Team.
7.5.2 USB Recovery
The USB Serial Downloader provides a means to download the
bootloader image to the chip over USB serial connection.
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