(grub.info.gz) Internals

 
 Appendix D Hacking GRUB
 ***********************
 
 This chapter documents the user-invisible aspect of GRUB.
 
    As a general rule of software development, it is impossible to keep
 the descriptions of the internals up-to-date, and it is quite hard to
 document everything. So refer to the source code, whenever you are not
 satisfied with this documentation.  Please assume that this gives just
 hints to you.

 
* Memory map                  The memory map of various components
* Embedded data               Embedded variables in GRUB
* Filesystem interface        The generic interface for filesystems
* Command interface           The generic interface for built-ins
* Bootstrap tricks            The bootstrap mechanism used in GRUB
* I/O ports detection         How to probe I/O ports used by INT 13H
* Memory detection            How to detect all installed RAM
* Low-level disk I/O          INT 13H disk I/O interrupts
* MBR                         The structure of Master Boot Record
* Partition table             The format of partition tables
* Submitting patches          Where and how you should send patches

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