On Feb 9, 2017, at 6:05 AM, Jun Nie <jun.nie@linaro.org> wrote:

2017-02-09 21:44 GMT+08:00 Jun Nie <jun.nie@linaro.org>:
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?
I know this app support parsing command line from shell. I am seeking
method to launch this app from BDS directly without shell but cannot
find where to specify value to LoadedImage->LoadOptions so that this
app can get command line from it.

The mechanism in EFI is the NVRAM variable for the boot option. See EFI_LOAD_OPTION.

https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Uefi/UefiSpec.h#L2037

The UI to create boot variables is implementation dependent. When we designed it conceptually we thought the OS installer would be the primary entity writing the boot option as it was the entity installing the OS loader.

I think there is a shell command to set boot options, I'm not sure if it lets you set the OptionalData in the EFI_LOAD_OPTION.

Thanks,

Andrew Fish

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
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