Porting Board Support Package in 2.X SDK

We are currently using the Serial_LTE_Modem application in a device.  I'm trying to upgrade it to the 2.2.0 SDK.  While there is a lot of information regarding the use of the DK or the thingy, I'm having a hard time finding information on porting to a new board.  Currently, I have take the nrf9160dk_9160 board package and copied it over to my own board files and modified it to using uart0 as the debug and console output and uart2 as the AT command interface.  Also redirecting the pins and removing RTS, CTS.  I've also attempted to remove Sleep mode.  But when I compile this, the board continuously resets.  I'm wondering where I can find info on porting packages for the 2.X SDKs.

I can provide all my conf files and board description file.  Or heck, the entire project if that can be helpful

Thanks,

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