[Linaro-uefi] UEFI LinuxLoader app usage

I am new to UEFI and trying to boot Linux with LinuxLoader app. But I cannot find detail information for below questions. Could anyone point out where I can find related information or example code? Thanks for your time!

1. How to feed command line to this app so that ProcessAppCommandLine() can process it?

2. And how should I generate device path string for raw blockIO device with specified offset/size? UEFI 2.6 spec does not provide much information in 9.4.5 Media Device Path Rules.

Thank you! Jun