phyCARD-M [PCA-A-M1-xxx]
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PHYTEC Messtechnik GmbH 2010 L-750e_1
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System Configuration and Booting
Although most features of the i.MX35 microcontroller are configured
and/or programmed during the initialization routine, other features,
which impact program execution, must be configured prior to
initialization.
The system start-up configuration includes:
•
Boot device select configuration (boot type)
•
Memory configuration
•
USB PHY configuration, etc.
The i.MX35 processor always begins fetching instruction from the
internal bootstrap ROM, sync flash or CS0 space. The operational
system boot mode of the i.MX35 processor is determined by the
configuration of the two external input pins, BMOD[1:0] during the
reset cycle. The settings of these pins control where the system is boot
from. They are accessible via boot pins X_BOOT[1:0] (X2B50 and
X2A50) of the X-Arc bus. These boot modes information are
registered during the system reset.
The following table shows the different boot modes, which can be
selected by configuring the two boot pins.
