Thread: Garmin eTREX 20 working as an eTREX 30

Originally Posted by kunix

Just wondering, what happens if we make MOVS R1,#1 or MOVS R1,#5, which also corespond to eTrex 30 (this fact can be seen at sub_801FAFAA).

Code:

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BTW, MOVS R0, R0 is not a good way to insert a NOP instruction, as it may affect flags in CPSR register.

I can confirm.
There are at least two models of PCBs, for etrex20/30.

Model1: In Memory 0x12009000 (i think model of PCB) -> 0x00043f3d
r0 = 2 for etrex20
r0 = 3 for etrex30

Model2: in Memory 0x12009000 (i think model of PCB) ---> Not looked yet.
r0 = 4 for etrex20
r0 = 5 for etrex30

The function that maps the gps model according to the motherboard.

Code:

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