Alternate platform support

Hi Team,
We are looking for adopting legato framework across our range of platform solutions viz. TI AM65x, NXP, ST etc.
So would you answer by below set of questions
Q1) So may I get to know is there any readily available legato framework including BSP & Platform Adapter layer for the above set of platforms?
Q2) If not, may I know how can I achieve the same, what all effort would be involved in the same like I have to create the BSP and port all specific Platform adapters against my platform/s etc?