[gPXE] Machines hangs when exiting from CLI

[Itay Gazit]

Hi Joshua, all,

Continue to our discussion we had a while ago, I continued my testing on
entering CLI during POST.

At this experiment I changed the main() to a blank function.

I tested 19 different models machines. The results were that 5 of the 19
hanged when exiting from CLI!   Including machines from HP, IBM and
SuperMicro.

My conclusion is that regardless the memory consumption, there is a major
problem in gPXE when exiting from gPXE during POST.

As I mentioned before, having a reliable CLI during POST is important.

I am willing to continue debug this issue, if you have any idea on how to
solve it then please let me know.

Thanks,

Itay
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