Hi, I've got a « Tomtom GO920(4M00.900) » device, on which I would like to play with OpenTom. This device has an internal non-removable 4 GB memory and a slot for one SD card. The internal non-removable memory contains the system and data for the Tomtom navigation system.
It seems that most tutorials on OpenTom's wiki have been written with SD card-only Tomtoms in mind: these SD cards can be read/written with another computer to restore the original system if something went wrong. However, with the internal memory, how can this be done ? The internal memory can be accessed as a regular usb-storage device when the Tomtom is plugged on its USB dock. If I change the ttsystem file and the new one doesn't work, the system won't boot anymore and I won't be able to restore the original ttsystem, is that correct ? Or is the usb-storage mode of the Tomtom implemented without using the 'ttsystem' kernel, for example in the NOR flash ? Or, alternatively, if a 'ttsystem' file is put on the external SD card, will the bootloader take it in priority ? Other questions : - other Tomtom models appear to have some kind of special connector through which the serial console can be grabbed. The Tomtom 920 only has an USB connector, nothing else. So I suppose there is no way of getting the serial console, is that correct ? - the device has a «reset» button, but its behaviour is unclear. Does it simply do an hard reboot, or does it restore something special ? Thanks, Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com
