Customer need to compare the hardware platform for K21 and K22, if both using the same frequency external crystal/oscillator. For both chips with the same USB module, the USB related code should be same. The porting focus on hardware platform difference.
And I find there is USB stack for K22, which also include USB HOST MSD demo.
Please check below link for more detailed info:
Freescale bare metal (no OS) USB Stack Rev. 5
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MEDICALUSB&fpsp=1&tab=Design_Tools_Ta...
Wish it helps.
best regards
Ma Hui
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