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AXEL LITE Hardware Manual
recovery operations. For further information on how to use the JTAG
interface, please contact the Technical Support Team.
5.5.2
USB Recovery
The USB Serial Downloader provides a means to download the
bootloader image to the chip over USB serial connection. Please refer to
the XELK Quick Start Guide for further details.
5.5.3
SD/MMC Recovery
MMC recovery is a valuable options that requires no special hardware at
all, apart a properly formatted MMC. When SD/MMC boot option is
selected, bootrom looks for a valid bootloader on SD/MMC. Once the
board is running after booting from SD, reprogramming the flash memory
is straightforward. The SD peripheral used for boot is MMC/SD/SDIO1
(please refer to 7.11.1).
5.6
Multiplexing
Most of the i.MX 6 processor pins have multiple signal options. These
signal to pin and pin to signal options are selected by the input output
multiplexer called IOMUX. The IOMUX enables flexible IO multiplexing
and is also used to configure other pin characteristics, such as voltage
level, drive strength, and hysteresis. Each IO pad has default and up to
seven alternate functions, which are software configurable.
Please refer to the following sections of the i.MX6 APRM for further
information pin assignment:
● chapter 4 "External Signals and Pin Multiplexing"
● section 4.1 "Pin assignments"
● section 4.2 "Muxing options"
● chapter 36 "IOMUX Controller (IOMUXC)"
October, 2016
v. 0.9.5
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