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The Bios Parameter Block (BPB) is 51 bytes, not 52. As-is, the
first byte of executable code from the floppy image boot record
is copied along with the BPB to boot.img; this extra byte
isn't harmful to leave in since execution begins at offset 0x63+2
rather than 0x3C+2, but is a little messy.
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Related issue #553
Determining the byte offset of core.img on the SeaGRUB floppy
is accomplished using grub_bo(), though it is memory bound as it
requires reading hex dumps for the pattern and comparand into memory.
The blocklists that are stored in the boot record and core.img are
sector numbers. Of particular note is the blocklist written
to core.img is always the location of its *second*
sector--not the first.
Blocklists are used because floppy disks DO NOT have an MBR or
MBR gap as the filesystem spans the entire disk. Consequently, the
core.img cannot be stored in the usual ~1MiB gap. Unfortunately,
using blocklists means they will have to be updated whenever
core.img is moved.
New functions added to grub-helper:
* grub_bo
* grub_bo_dump
* grub_bo_search
* grub_blocklist_format
* grub_blocklist_generate
* grub_floppy_image_make_bootable
* grub_floppy_image_update_blocklists
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Related issue #553
Previously, the GRUB boot image and core image were concatenated
together and padding added to create a (pseudo) floppy image.
However, testing revealed that GRUB has issues dynamically loading
modules from $prefix if $prefix is not located on the same device
from which GRUB booted.
In order to get around this issue, a proper 2.88MiB floppy image is
created using mkfs.fat with GRUB modules copied to directories on
the filesystem (i.e, /boot/grub/i386-pc). The 2.88MiB filesystem
size is necessary to be able to fit all modules onto the image.
New functions added to grub-helper:
* grub_floppy_image_mmd (create directories on image using mtools mmd)
* grub_floppy_image_mcopy (copy files to image using mtools mcopy)
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* projects/grub/grub
* projects/grub/grub-helper
ditto
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The check for an existing, non-directory file as $keymap_out_path was
added to prevent the (unlikely) scenario of attempting writing a file
to a file as if it were a directory.
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The idea is to build a font from source and then make a PF2 format
file from it using grub-mkfont. This cuts down on the number of
binary files committed to history in the repository.
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grub-mklayout was the intended program to use for generating compiled
GRUB keylayouts. Somewhere along the way grub-kbdcomp was erroneously
substituted in its place.
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