Boot Order; Usb Serial Console - Cherry Theobroma PX30-mQ7 User Manual

Note: The fan is only necessary in high ambient temperatures. Under normal conditions, the PX30-uQ7 operates passively
cooled.

3.5 Boot Order

The used boot order of the PX30-uQ7 module depends on the value of the BIOS_DISABLE# signal. On the Haikou baseboard,
this signal can be set using a slider switch ( BOOT SW ), with the two positions labeled Normal Boot, and BIOS Disable.
As shown in the table below, the BIOS Disable position disables the eMMC storage device:
If no bootloader is found on any storage device, the PX30-uQ7 module will go into USB loader mode, showing up as a USB
device on the USB-OTG port.
The electrical state of the BIOS_DISABLE# signal for both slider positions is shown below:

3.6 USB Serial Console

The evaluation board contains an on-board Silicon Labs CP2102N USB-serial converter. Connect the included Micro-USB
cable to the Micro-USB jack labeled USB-UART Bridge :
PX30-uQ7 User Manual
© Theobroma Systems Design und Consulting GmbH
Fig. 3.3: Fan connector
Normal Boot
1 eMMC storage
2 SD card
3 USB loader
BIOS_DISABLE# signal
Slider Position
Floating (on-module pull-up to 3.3V)
Normal Boot
GND
BIOS Disable
BIOS Disable
SD card
USB loader
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