7.x.x SDK compatibility with nRF51422 - V2 chips

[Mark Rages]

To support a mix of v2 and v3 chips, I want to use the 7.x SDK. But I'm not sure it's compatible. The matrix at infocenter.nordicsemi.com/.../nRF51_Series_Compatibility_Matrix_v2.3.pdf contains a blank space:

Is there meant to be an 7.x SDK there, or am I stuck maintaining two builds and SDK targets?

[RK]

There's blank space there because there's no SDK which has the 8.0.0 SD plus library code compatible with the rev 2 chip. The last SDK with library code for the rev2 chip is 6.1, however you can use softdevice v8 with rev2 (provided you set a couple of flags).

You're really better off using two builds and two SDKs, although you could use the 6.x SDK and the 8.x softdevice on both rev 2 and rev 3, that would work, just need to figure out which chip you have at runtime and turn the flags on, or not.

[RK]

so you may be using the bits of the SDK which either still have the workarounds for the rev 2 bugs and not the newer drivers, or you've been fortunate not to hit the issues for which there are no-longer workarounds. it may work in many circumstances, but it's not tested and not guaranteed and you may well have intermittent issues.