[FS#986] ARV752DPW missing default switch config

[LEDE Bugs]

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FS#986 - ARV752DPW missing default switch config
User who did this - Oliver Muth (Oliver)

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I dug in backups of the ancient past and found the attached patch. Issue here was that the CPU port was not enabled. Maybe the "old" u-boot in the Wiki does not have this?

Anyway, looking into the source gave me confidence that danube pin 19 controls the reset of the rtl8306, also on ARV752DPW. So I became brave and toggled the direction to output - and got immediately yelled at. 
Network connection was gone. ;-)
I'll pull the router tomorrow and play with it.


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