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Revision 0.6
OMAP TM 4 PandaBoard System
Reference Manual
November 29, 2010
DOC-21010
o
o
o
o
Earpiece Output
Aux Output
Hands-free 8 ohm driver
Dual Vibrator
? Misc Control
o
o
o
? Power
o
o
GPO
I2C (high speed)
Power on/off
Internal LDOs
Internal negative charge pump
2.6
SYSBOOT Configuration
The OMAP4430 Processor has eight SYSBOOT inputs. These inputs are sampled after a board reset, and
determine the booting and operating mode of the OMAP4430 Processor. The upper two inputs
(SYSBOOT[7:6]) control the clocking modes of the part (i.e. enabling/disabling the internal oscillator to
allow using a crystal input or oscillator). They are currently set to “11” and should not be changed.
The lower six inputs, SYSBOOT[5:0] determine the type and order of memory or peripheral booting.
SYSBOOT[5] determines whether memory or peripheral booting is preferred. The SYSBOOT
definitions may be found in the OMAP4430 TRM, but are included here for convenience. See Table 2 on
page 22 for the SYSBOOT definitions for peripheral preferred booting, and Table 3 on page 23 for
memory preferred booting SYSBOOT definitions. The shaded row in Table 2 is the default configuration
of the PandaBoard.
If it is desired to change the SYSBOOT configuration, resistors may be added or removed from the
SYSBOOT[5:0] lines. The SYSBOOT[5:0] lines have weak internal pull-down resistors, so removing the
resistor will result in the line being sampled as a ‘0’ at reset, and installing a 3.3K or lower value resistor
will result in the line being sampled as a ‘1’ at reset. See Figure 3 on page 24 for the location of the
resistors on SYSBOOT[5:0]. These resistors are connected to OMAP4430 as follows:
?
?
?
?
?
?
R123: SYSBOOT0
R136: SYSBOOT1
R128: SYSBOOT2
R119: SYSBOOT3
R135: SYSBOOT4
R137: SYSBOOT5
NOTE: Do not use pull-up resistance values higher than 3.3Kohm on the SYSBOOT lines. This would
create a voltage divider with the internal OMAP pulldown, potentially causing an invalid value to be
internally latched for SYSBOOT.
Page 21 of 82
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