Added "M4F"
Added "M4F"

Several listed as Cortex M4 cores are actually M4F cores (having a floating point unit), I did some homework to figure out which ones have FPU's. It appears that the K20D50M is the only board with a Cortex-M4 MCU that is does not have a floating point unit.
Willem23/mbed,fahhem/mbed-os,wodji/mbed,DanKupiniak/mbed,Tiryoh/mbed,monkiineko/mbed-os,j-greffe/mbed-os,JasonHow44/mbed,NitinBhaskar/mbed,CalSol/mbed,Sweet-Peas/mbed,radhika-raghavendran/mbed-os5.1-onsemi,JasonHow44/mbed,JasonHow44/mbed,xcrespo/mbed,c1728p9/mbed-os,pbrook/mbed,Archcady/mbed-os,NXPmicro/mbed,tung7970/mbed-os-1,DanKupiniak/mbed,bentwire/mbed,j-greffe/mbed-os,rosterloh/mbed,al177/mbed,jrjang/mbed,Tiryoh/mbed,nvlsianpu/mbed,mikaleppanen/mbed-os,pbrook/mbed,maximmbed/mbed,infinnovation/mbed-os,YarivCol/mbed-os,struempelix/mbed,bentwire/mbed,bikeNomad/mbed,masaohamanaka/mbed,adamgreen/mbed,mikaleppanen/mbed-os,radhika-raghavendran/mbed-os5.1-onsemi,ARM-software/mbed-beetle,0xc0170/mbed-drivers,ryankurte/mbed-os,bremoran/mbed-drivers,karsev/mbed-os,maximmbed/mbed,rgrover/mbed,FranklyDev/mbed,devanlai/mbed,nvlsianpu/mbed,mbedmicro/mbed,DanKupiniak/mbed,adustm/mbed,adustm/mbed,naves-thiago/mbed-midi,screamerbg/mbed,jeremybrodt/mbed,jeremybrodt/mbed,kl-cruz/mbed-os,mikaleppanen/mbed-os,masaohamanaka/mbed,sam-geek/mbed,hwfwgrp/mbed,fvincenzo/mbed-os,nvlsianpu/mbed,radhika-raghavendran/mbed-os5.1-onsemi,pbrook/mbed,autopulated/mbed,brstew/MBED-BUILD,andcor02/mbed-os,brstew/MBED-BUILD,j-greffe/mbed-os,fanghuaqi/mbed,jpbrucker/mbed,pedromes/mbed,jferreir/mbed,bikeNomad/mbed,betzw/mbed-os,andcor02/mbed-os,alertby/mbed,logost/mbed,rgrover/mbed,Archcady/mbed-os,pi19404/mbed,pbrook/mbed,wodji/mbed,Timmmm/mbed,theotherjimmy/mbed,tung7970/mbed-os-1,jamesadevine/mbed,tung7970/mbed-os,kpurusho/mbed,nvlsianpu/mbed,mbedmicro/mbed,Timmmm/mbed,Tiryoh/mbed,getopenmono/mbed,adustm/mbed,Willem23/mbed,Marcomissyou/mbed,monkiineko/mbed-os,kjbracey-arm/mbed,K4zuki/mbed,K4zuki/mbed,ban4jp/mbed,andreaslarssonublox/mbed,c1728p9/mbed-os,geky/mbed,monkiineko/mbed-os,kl-cruz/mbed-os,tung7970/mbed-os,theotherjimmy/mbed,Willem23/mbed,logost/mbed,RonEld/mbed,fanghuaqi/mbed,andcor02/mbed-os,nabilbendafi/mbed,mmorenobarm/mbed-os,sam-geek/mbed,andcor02/mbed-os,nRFMesh/mbed-os,maximmbed/mbed,andreaslarssonublox/mbed,catiedev/mbed-os,fpiot/mbed-ats,infinnovation/mbed-os,catiedev/mbed-os,pi19404/mbed,Marcomissyou/mbed,jamesadevine/mbed,tung7970/mbed-os-1,betzw/mbed-os,HeadsUpDisplayInc/mbed,bentwire/mbed,arostm/mbed-os,ban4jp/mbed,mazimkhan/mbed-os,NXPmicro/mbed,rgrover/mbed,masaohamanaka/mbed,Shengliang/mbed,Timmmm/mbed,YarivCol/mbed-os,andreaslarssonublox/mbed,HeadsUpDisplayInc/mbed,bcostm/mbed-os,sam-geek/mbed,mikaleppanen/mbed-os,sam-geek/mbed,jeremybrodt/mbed,NXPmicro/mbed,tung7970/mbed-os,rosterloh/mbed,bentwire/mbed,fanghuaqi/mbed,ARM-software/mbed-beetle,mmorenobarm/mbed-os,EmuxEvans/mbed,NitinBhaskar/mbed,brstew/MBED-BUILD,pradeep-gr/mbed-os5-onsemi,betzw/mbed-os,theotherjimmy/mbed,mazimkhan/mbed-os,jrjang/mbed,cvtsi2sd/mbed-os,fanghuaqi/mbed,radhika-raghavendran/mbed-os5.1-onsemi,bikeNomad/mbed,Sweet-Peas/mbed,getopenmono/mbed,jeremybrodt/mbed,c1728p9/mbed-os,fpiot/mbed-ats,RonEld/mbed,fpiot/mbed-ats,bentwire/mbed,kjbracey-arm/mbed,jpbrucker/mbed,theotherjimmy/mbed,svogl/mbed-os,brstew/MBED-BUILD,xcrespo/mbed,wodji/mbed,theotherjimmy/mbed,nvlsianpu/mbed,ban4jp/mbed,tung7970/mbed-os-1,rgrover/mbed,geky/mbed,K4zuki/mbed,brstew/MBED-BUILD,cvtsi2sd/mbed-os,pbrook/mbed,Sweet-Peas/mbed,c1728p9/mbed-os,Archcady/mbed-os,EmuxEvans/mbed,karsev/mbed-os,Timmmm/mbed,HeadsUpDisplayInc/mbed,geky/mbed,alertby/mbed,struempelix/mbed,kpurusho/mbed,adamgreen/mbed,svogl/mbed-os,cvtsi2sd/mbed-os,K4zuki/mbed,pi19404/mbed,brstew/MBED-BUILD,fpiot/mbed-ats,ryankurte/mbed-os,jeremybrodt/mbed,arostm/mbed-os,logost/mbed,CalSol/mbed,fahhem/mbed-os,nRFMesh/mbed-os,kjbracey-arm/mbed,nvlsianpu/mbed,fahhem/mbed-os,mnlipp/mbed,xcrespo/mbed,jferreir/mbed,masaohamanaka/mbed,c1728p9/mbed-os,larks/mbed,iriark01/mbed-drivers,mazimkhan/mbed-os,GustavWi/mbed,rosterloh/mbed,nRFMesh/mbed-os,mnlipp/mbed,screamerbg/mbed,autopulated/mbed,tung7970/mbed-os-1,arostm/mbed-os,dbestm/mbed,Marcomissyou/mbed,maximmbed/mbed,RonEld/mbed,jamesadevine/mbed,nRFMesh/mbed-os,mnlipp/mbed,fvincenzo/mbed-os,pi19404/mbed,alertby/mbed,pradeep-gr/mbed-os5-onsemi,naves-thiago/mbed-midi,xcrespo/mbed,naves-thiago/mbed-midi,fpiot/mbed-ats,arostm/mbed-os,masaohamanaka/mbed,dbestm/mbed,adamgreen/mbed,struempelix/mbed,kpurusho/mbed,adustm/mbed,andcor02/mbed-os,mazimkhan/mbed-os,pedromes/mbed,radhika-raghavendran/mbed-os5.1-onsemi,adustm/mbed,mbedmicro/mbed,ryankurte/mbed-os,nRFMesh/mbed-os,devanlai/mbed,FranklyDev/mbed,larks/mbed,mnlipp/mbed,fvincenzo/mbed-os,kpurusho/mbed,larks/mbed,adamgreen/mbed,naves-thiago/mbed-midi,theotherjimmy/mbed,struempelix/mbed,struempelix/mbed,GustavWi/mbed,fahhem/mbed-os,getopenmono/mbed,pbrook/mbed,kpurusho/mbed,alertby/mbed,Tiryoh/mbed,jferreir/mbed,al177/mbed,kpurusho/mbed,svogl/mbed-os,NXPmicro/mbed,Archcady/mbed-os,rosterloh/mbed,jrjang/mbed,jrjang/mbed,karsev/mbed-os,sg-/mbed-drivers,JasonHow44/mbed,tung7970/mbed-os,Sweet-Peas/mbed,masaohamanaka/mbed,betzw/mbed-os,infinnovation/mbed-os,nabilbendafi/mbed,CalSol/mbed,mazimkhan/mbed-os,jrjang/mbed,pradeep-gr/mbed-os5-onsemi,bcostm/mbed-os,CalSol/mbed,ryankurte/mbed-os,alertby/mbed,autopulated/mbed,Marcomissyou/mbed,mmorenobarm/mbed-os,netzimme/mbed-os,sam-geek/mbed,YarivCol/mbed-os,jferreir/mbed,RonEld/mbed,CalSol/mbed,Shengliang/mbed,K4zuki/mbed,andreaslarssonublox/mbed,fahhem/mbed-os,svogl/mbed-os,NitinBhaskar/mbed,jpbrucker/mbed,devanlai/mbed,Shengliang/mbed,getopenmono/mbed,mikaleppanen/mbed-os,CalSol/mbed,getopenmono/mbed,Sweet-Peas/mbed,rgrover/mbed,bcostm/mbed-os,bulislaw/mbed-os,Marcomissyou/mbed,Timmmm/mbed,nabilbendafi/mbed,svastm/mbed,hwfwgrp/mbed,j-greffe/mbed-os,logost/mbed,geky/mbed,cvtsi2sd/mbed-os,jamesadevine/mbed,cvtsi2sd/mbed-os,ban4jp/mbed,catiedev/mbed-os,Willem23/mbed,mnlipp/mbed,getopenmono/mbed,ban4jp/mbed,NitinBhaskar/mbed,hwfwgrp/mbed,naves-thiago/mbed-midi,bikeNomad/mbed,bulislaw/mbed-os,c1728p9/mbed-os,andcor02/mbed-os,tung7970/mbed-os,YarivCol/mbed-os,larks/mbed,Shengliang/mbed,iriark01/mbed-drivers,al177/mbed,FranklyDev/mbed,infinnovation/mbed-os,ban4jp/mbed,ARM-software/mbed-beetle,GustavWi/mbed,nabilbendafi/mbed,autopulated/mbed,arostm/mbed-os,kl-cruz/mbed-os,mbedmicro/mbed,Timmmm/mbed,adustm/mbed,HeadsUpDisplayInc/mbed,andreaslarssonublox/mbed,cvtsi2sd/mbed-os,ryankurte/mbed-os,jrjang/mbed,pradeep-gr/mbed-os5-onsemi,YarivCol/mbed-os,netzimme/mbed-os,devanlai/mbed,nRFMesh/mbed-os,fvincenzo/mbed-os,jpbrucker/mbed,j-greffe/mbed-os,EmuxEvans/mbed,pedromes/mbed,monkiineko/mbed-os,hwfwgrp/mbed,alertby/mbed,fvincenzo/mbed-os,GustavWi/mbed,NXPmicro/mbed,kl-cruz/mbed-os,monkiineko/mbed-os,kl-cruz/mbed-os,pi19404/mbed,adamgreen/mbed,struempelix/mbed,JasonHow44/mbed,RonEld/mbed,NitinBhaskar/mbed,Shengliang/mbed,YarivCol/mbed-os,ryankurte/mbed-os,j-greffe/mbed-os,infinnovation/mbed-os,Tiryoh/mbed,Tiryoh/mbed,larks/mbed,larks/mbed,nabilbendafi/mbed,kl-cruz/mbed-os,bcostm/mbed-os,bcostm/mbed-os,karsev/mbed-os,Shengliang/mbed,kjbracey-arm/mbed,EmuxEvans/mbed,catiedev/mbed-os,DanKupiniak/mbed,pedromes/mbed,svastm/mbed,jferreir/mbed,hwfwgrp/mbed,RonEld/mbed,xcrespo/mbed,HeadsUpDisplayInc/mbed,al177/mbed,bulislaw/mbed-os,adamgreen/mbed,jferreir/mbed,screamerbg/mbed,karsev/mbed-os,betzw/mbed-os,karsev/mbed-os,xcrespo/mbed,dbestm/mbed,monkiineko/mbed-os,arostm/mbed-os,jamesadevine/mbed,al177/mbed,Archcady/mbed-os,geky/mbed,svogl/mbed-os,mmorenobarm/mbed-os,bentwire/mbed,autopulated/mbed,ARM-software/mbed-beetle,devanlai/mbed,FranklyDev/mbed,mbedmicro/mbed,mikaleppanen/mbed-os,pradeep-gr/mbed-os5-onsemi,bulislaw/mbed-os,wodji/mbed,catiedev/mbed-os,pedromes/mbed,bremoran/mbed-drivers,bcostm/mbed-os,pi19404/mbed,autopulated/mbed,pedromes/mbed,mazimkhan/mbed-os,bulislaw/mbed-os,Archcady/mbed-os,K4zuki/mbed,NXPmicro/mbed,wodji/mbed,jpbrucker/mbed,mmorenobarm/mbed-os,mnlipp/mbed,netzimme/mbed-os,HeadsUpDisplayInc/mbed,radhika-raghavendran/mbed-os5.1-onsemi,netzimme/mbed-os,netzimme/mbed-os,logost/mbed,EmuxEvans/mbed,rosterloh/mbed,screamerbg/mbed,screamerbg/mbed,betzw/mbed-os,pradeep-gr/mbed-os5-onsemi,FranklyDev/mbed,al177/mbed,svastm/mbed,fanghuaqi/mbed,mmorenobarm/mbed-os,naves-thiago/mbed-midi,infinnovation/mbed-os,screamerbg/mbed,catiedev/mbed-os,maximmbed/mbed,nabilbendafi/mbed,dbestm/mbed,GustavWi/mbed,hwfwgrp/mbed,jamesadevine/mbed,dbestm/mbed,Sweet-Peas/mbed,maximmbed/mbed,sg-/mbed-drivers,dbestm/mbed,svogl/mbed-os,Marcomissyou/mbed,svastm/mbed,devanlai/mbed,rosterloh/mbed,fpiot/mbed-ats,EmuxEvans/mbed,bikeNomad/mbed,fahhem/mbed-os,wodji/mbed,0xc0170/mbed-drivers,svastm/mbed,logost/mbed,JasonHow44/mbed,netzimme/mbed-os,Willem23/mbed,jpbrucker/mbed,bulislaw/mbed-os