a000298_approval, dave_user
551
edits
Changes
add WDOG_B signal
To overwrite the boot configuration these pins can be pulled low or high with 1kΩ resistor, the pull-up rail has to be a 3.3V enabled by BOARD_PGOOD signal.
=== WDOG_B ===
WDOG_B is a PMIC input signal that is configured by default to generate a system reset. It is internally connected to processor's watchdog output.
=== Handling CPU-initiated software reset ===
''TBD''
This technique is implemented in [[DESK-MX8-L]]. At software level, U-Boot and Linux kernel software reset routines make use of processor's WDT #2 to assert the WDOG2_B WDOG1_WDOG_B reset signal. This signal in turn is routed to GPIO_1 GPIO1_IO02 pad (MUX mode = 1). At hardware level, this signal is AC-coupled connected to the PMIC WDOG_B input that generates a 3-state output buffer (please refer to U22 chip of [[AxelEVB-Lite]] carrier board), driving PMIC_PWRONsystem POR.
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[[Category:ORCA]]