Hi Rich,
it may be difficult to define a best version. Naturally the newest version should be the best option, but there are always patches required, then after some time the latest version is released it becomes stable.
Please note that there are BSPs for i.MX processors developed by NXP and there are also BSPs created by a community external to NXP such as the one you are referring to.
You can find the NXP BSPs releases here: git.freescale.com > fsl-arm-yocto-bsp.git
On the other hand the BSPs releases developed by the external community can be found here: https://github.com/Freescale/
If you are using a board based on our Reference Designs and Evaluation Boards you may use our BSP, in this case imx-4.1-krogoth
But if you are using a custom board and it is not based on our reference Designs you may use a BSP developed by the community, in this case branch Morty would be the indicated.
just please be aware that NXP provides support of the BSPs developed by NXP, but unfortunately the releases of the external community are out of our scope.
Best regards,
Carlos
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