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I've debugging paging using gdb but still can't got main problem paging. Because my paging code,can't arrise page fault.

Examine the Page Table in memory to make sure that it is as you expect it to be.

Check the location of the page fault and the reason for it (shown in the error code). These should give you an idea as to where to look for the problem.

Sorry I want to talk how to setup gdt in multiboot? Preferable using multiboot or make own bootloader?