A x e l H a r d w a r e M a n u a l
v . 1 . 0 . 4
Mode signal J2 pin Pin name
BOOT_CFG4[0]
J2.55
EIM_DA24
BOOT_CFG4[1]
J2.57
EIM_DA25
BOOT_CFG4[2]
J2.59
EIM_DA26
BOOT_CFG4[3]
J2.63
EIM_DA27
BOOT_CFG4[4]
J2.65
EIM_DA28
BOOT_CFG4[5]
J2.67
EIM_DA29
BOOT_CFG4[6]
J2.69
EIM_DA30
BOOT_CFG4[7]
J2.71
EIM_DA31
For each BOOT_MODE[31:0] pin it is possible to populate
upper or lower side resistor in order to change default value
that is set on module itself.
5.5
Clock scheme
This section will be completed in a future version of this
manual.
5.6
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 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.
5.6.1
JTAG Recovery
JTAG recovery, though very useful (especially in development
or production environment), requires dedicated hardware and
software tools. AXEL provides 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.
April, 2015
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