tools, pyboard.py: Write data to pyboard in chunks of 256 bytes.
tools, pyboard.py: Write data to pyboard in chunks of 256 bytes.

This speeds up writes significantly.

blmorris/micropython,Timmenem/micropython,orionrobots/micropython,KISSMonX/micropython,firstval/micropython,skybird6672/micropython,dhylands/micropython,heisewangluo/micropython,galenhz/micropython,dmazzella/micropython,tuc-osg/micropython,alex-march/micropython,vitiral/micropython,Vogtinator/micropython,mgyenik/micropython,lbattraw/micropython,MrSurly/micropython,TDAbboud/micropython,hiway/micropython,cloudformdesign/micropython,ceramos/micropython,slzatz/micropython,orionrobots/micropython,xuxiaoxin/micropython,cwyark/micropython,Vogtinator/micropython,ChuckM/micropython,stonegithubs/micropython,omtinez/micropython,dinau/micropython,skybird6672/micropython,ruffy91/micropython,ganshun666/micropython,pramasoul/micropython,kostyll/micropython,ceramos/micropython,tuc-osg/micropython,misterdanb/micropython,slzatz/micropython,MrSurly/micropython-esp32,chrisdearman/micropython,adafruit/micropython,dinau/micropython,alex-march/micropython,praemdonck/micropython,SHA2017-badge/micropython-esp32,galenhz/micropython,toolmacher/micropython,martinribelotta/micropython,puuu/micropython,infinnovation/micropython,mhoffma/micropython,ryannathans/micropython,emfcamp/micropython,ChuckM/micropython,utopiaprince/micropython,swegener/micropython,drrk/micropython,PappaPeppar/micropython,dmazzella/micropython,aethaniel/micropython,pfalcon/micropython,danicampora/micropython,danicampora/micropython,paul-xxx/micropython,dxxb/micropython,SungEun-Steve-Kim/test-mp,dmazzella/micropython,oopy/micropython,ryannathans/micropython,matthewelse/micropython,dinau/micropython,suda/micropython,deshipu/micropython,neilh10/micropython,adamkh/micropython,tralamazza/micropython,mpalomer/micropython,tuc-osg/micropython,EcmaXp/micropython,suda/micropython,galenhz/micropython,cwyark/micropython,trezor/micropython,micropython/micropython-esp32,jmarcelino/pycom-micropython,adamkh/micropython,TDAbboud/micropython,utopiaprince/micropython,Vogtinator/micropython,MrSurly/micropython,hosaka/micropython,deshipu/micropython,blazewicz/micropython,vriera/micropython,vitiral/micropython,henriknelson/micropython,henriknelson/micropython,cwyark/micropython,supergis/micropython,infinnovation/micropython,blazewicz/micropython,TDAbboud/micropython,matthewelse/micropython,lowRISC/micropython,omtinez/micropython,jimkmc/micropython,vriera/micropython,danicampora/micropython,SHA2017-badge/micropython-esp32,turbinenreiter/micropython,adafruit/circuitpython,lbattraw/micropython,slzatz/micropython,dxxb/micropython,mhoffma/micropython,kerneltask/micropython,xuxiaoxin/micropython,cnoviello/micropython,adafruit/circuitpython,ericsnowcurrently/micropython,rubencabrera/micropython,kerneltask/micropython,praemdonck/micropython,adafruit/micropython,rubencabrera/micropython,ernesto-g/micropython,skybird6672/micropython,martinribelotta/micropython,puuu/micropython,jmarcelino/pycom-micropython,heisewangluo/micropython,turbinenreiter/micropython,alex-robbins/micropython,deshipu/micropython,ruffy91/micropython,tdautc19841202/micropython,misterdanb/micropython,mianos/micropython,mhoffma/micropython,adafruit/circuitpython,pramasoul/micropython,drrk/micropython,oopy/micropython,xyb/micropython,galenhz/micropython,selste/micropython,kerneltask/micropython,ericsnowcurrently/micropython,TDAbboud/micropython,rubencabrera/micropython,trezor/micropython,misterdanb/micropython,Peetz0r/micropython-esp32,firstval/micropython,ericsnowcurrently/micropython,puuu/micropython,swegener/micropython,utopiaprince/micropython,tdautc19841202/micropython,cwyark/micropython,warner83/micropython,henriknelson/micropython,lbattraw/micropython,adafruit/circuitpython,tuc-osg/micropython,ericsnowcurrently/micropython,HenrikSolver/micropython,Peetz0r/micropython-esp32,oopy/micropython,ChuckM/micropython,jimkmc/micropython,noahchense/micropython,ganshun666/micropython,Timmenem/micropython,noahchense/micropython,torwag/micropython,adamkh/micropython,hiway/micropython,vitiral/micropython,emfcamp/micropython,adamkh/micropython,trezor/micropython,misterdanb/micropython,warner83/micropython,bvernoux/micropython,ahotam/micropython,matthewelse/micropython,KISSMonX/micropython,infinnovation/micropython,PappaPeppar/micropython,xuxiaoxin/micropython,heisewangluo/micropython,redbear/micropython,matthewelse/micropython,bvernoux/micropython,EcmaXp/micropython,jlillest/micropython,jlillest/micropython,suda/micropython,pozetroninc/micropython,cnoviello/micropython,noahwilliamsson/micropython,paul-xxx/micropython,martinribelotta/micropython,kerneltask/micropython,lowRISC/micropython,supergis/micropython,infinnovation/micropython,stonegithubs/micropython,feilongfl/micropython,firstval/micropython,warner83/micropython,cloudformdesign/micropython,turbinenreiter/micropython,supergis/micropython,KISSMonX/micropython,turbinenreiter/micropython,PappaPeppar/micropython,skybird6672/micropython,oopy/micropython,dinau/micropython,omtinez/micropython,mpalomer/micropython,hiway/micropython,xyb/micropython,Timmenem/micropython,kerneltask/micropython,hosaka/micropython,vitiral/micropython,chrisdearman/micropython,xhat/micropython,rubencabrera/micropython,ChuckM/micropython,dhylands/micropython,EcmaXp/micropython,xhat/micropython,emfcamp/micropython,vriera/micropython,blmorris/micropython,galenhz/micropython,pfalcon/micropython,pfalcon/micropython,MrSurly/micropython-esp32,MrSurly/micropython-esp32,cnoviello/micropython,cnoviello/micropython,vitiral/micropython,blmorris/micropython,torwag/micropython,jimkmc/micropython,mpalomer/micropython,mgyenik/micropython,ruffy91/micropython,mpalomer/micropython,blazewicz/micropython,SungEun-Steve-Kim/test-mp,noahwilliamsson/micropython,kostyll/micropython,dhylands/micropython,selste/micropython,tdautc19841202/micropython,selste/micropython,pozetroninc/micropython,utopiaprince/micropython,dmazzella/micropython,heisewangluo/micropython,lowRISC/micropython,SHA2017-badge/micropython-esp32,noahchense/micropython,blmorris/micropython,torwag/micropython,tralamazza/micropython,SungEun-Steve-Kim/test-mp,vriera/micropython,turbinenreiter/micropython,pozetroninc/micropython,tobbad/micropython,jlillest/micropython,drrk/micropython,martinribelotta/micropython,adafruit/micropython,suda/micropython,micropython/micropython-esp32,tralamazza/micropython,EcmaXp/micropython,firstval/micropython,AriZuu/micropython,neilh10/micropython,chrisdearman/micropython,pramasoul/micropython,puuu/micropython,kostyll/micropython,blazewicz/micropython,mianos/micropython,feilongfl/micropython,hosaka/micropython,toolmacher/micropython,noahchense/micropython,ericsnowcurrently/micropython,xyb/micropython,tobbad/micropython,KISSMonX/micropython,Peetz0r/micropython-esp32,danicampora/micropython,MrSurly/micropython-esp32,cwyark/micropython,aethaniel/micropython,redbear/micropython,cloudformdesign/micropython,deshipu/micropython,dhylands/micropython,neilh10/micropython,praemdonck/micropython,utopiaprince/micropython,Peetz0r/micropython-esp32,drrk/micropython,redbear/micropython,ernesto-g/micropython,ahotam/micropython,jmarcelino/pycom-micropython,jmarcelino/pycom-micropython,alex-march/micropython,henriknelson/micropython,vriera/micropython,mgyenik/micropython,hosaka/micropython,xuxiaoxin/micropython,swegener/micropython,infinnovation/micropython,aethaniel/micropython,orionrobots/micropython,ryannathans/micropython,rubencabrera/micropython,praemdonck/micropython,omtinez/micropython,adamkh/micropython,ganshun666/micropython,ganshun666/micropython,pozetroninc/micropython,Timmenem/micropython,MrSurly/micropython-esp32,micropython/micropython-esp32,adafruit/circuitpython,xyb/micropython,dxxb/micropython,xhat/micropython,redbear/micropython,danicampora/micropython,Peetz0r/micropython-esp32,blmorris/micropython,henriknelson/micropython,martinribelotta/micropython,mhoffma/micropython,paul-xxx/micropython,alex-march/micropython,toolmacher/micropython,mgyenik/micropython,heisewangluo/micropython,alex-robbins/micropython,hiway/micropython,alex-robbins/micropython,bvernoux/micropython,lowRISC/micropython,noahwilliamsson/micropython,ruffy91/micropython,alex-march/micropython,mianos/micropython,ganshun666/micropython,ChuckM/micropython,MrSurly/micropython,feilongfl/micropython,supergis/micropython,PappaPeppar/micropython,cnoviello/micropython,ernesto-g/micropython,tdautc19841202/micropython,AriZuu/micropython,HenrikSolver/micropython,ceramos/micropython,jmarcelino/pycom-micropython,noahchense/micropython,micropython/micropython-esp32,dhylands/micropython,skybird6672/micropython,lowRISC/micropython,alex-robbins/micropython,noahwilliamsson/micropython,deshipu/micropython,AriZuu/micropython,firstval/micropython,supergis/micropython,SungEun-Steve-Kim/test-mp,feilongfl/micropython,trezor/micropython,hiway/micropython,lbattraw/micropython,warner83/micropython,ceramos/micropython,AriZuu/micropython,pfalcon/micropython,TDAbboud/micropython,cloudformdesign/micropython,omtinez/micropython,xhat/micropython,ahotam/micropython,jimkmc/micropython,paul-xxx/micropython,swegener/micropython,tobbad/micropython,selste/micropython,stonegithubs/micropython,ernesto-g/micropython,slzatz/micropython,KISSMonX/micropython,drrk/micropython,toolmacher/micropython,feilongfl/micropython,tobbad/micropython,HenrikSolver/micropython,jlillest/micropython,xhat/micropython,pozetroninc/micropython,adafruit/micropython,MrSurly/micropython,ernesto-g/micropython,stonegithubs/micropython,mhoffma/micropython,blazewicz/micropython,HenrikSolver/micropython,EcmaXp/micropython,kostyll/micropython,SungEun-Steve-Kim/test-mp,trezor/micropython,adafruit/circuitpython,praemdonck/micropython,paul-xxx/micropython,bvernoux/micropython,tdautc19841202/micropython,aethaniel/micropython,micropython/micropython-esp32,pramasoul/micropython,matthewelse/micropython,ryannathans/micropython,emfcamp/micropython,Vogtinator/micropython,warner83/micropython,orionrobots/micropython,pfalcon/micropython,chrisdearman/micropython,AriZuu/micropython,ruffy91/micropython,jimkmc/micropython,mianos/micropython,tralamazza/micropython,PappaPeppar/micropython,aethaniel/micropython,hosaka/micropython,tobbad/micropython,neilh10/micropython,adafruit/micropython,slzatz/micropython,swegener/micropython,stonegithubs/micropython,selste/micropython,ahotam/micropython,SHA2017-badge/micropython-esp32,neilh10/micropython,oopy/micropython,torwag/micropython,toolmacher/micropython,chrisdearman/micropython,misterdanb/micropython,dinau/micropython,SHA2017-badge/micropython-esp32,bvernoux/micropython,ceramos/micropython,mgyenik/micropython,torwag/micropython,mpalomer/micropython,jlillest/micropython,HenrikSolver/micropython,dxxb/micropython,redbear/micropython,pramasoul/micropython,ryannathans/micropython,ahotam/micropython,Timmenem/micropython,xuxiaoxin/micropython,alex-robbins/micropython,matthewelse/micropython,noahwilliamsson/micropython,mianos/micropython,lbattraw/micropython,suda/micropython,Vogtinator/micropython,cloudformdesign/micropython,dxxb/micropython,kostyll/micropython,puuu/micropython,MrSurly/micropython,tuc-osg/micropython,xyb/micropython,orionrobots/micropython,emfcamp/micropython