When the extended primary loader for CD was introduced in 2008-2009 it
used to load a relatively small secondary loader. Later the secondary
loader was integrated into the kernel, hence the primary loader had to
load the kernel which is 100kB+. The EDD BIOS specification allows to
read less than 0x80 sectors at once using Int 0x13 0x42 service. For a
512-byte sector this is less than 0x10000 bytes which is a 64kB limit.
The same limit of 64kB is reached on a CD with only 0x20 sectors,
because the sector size is 2048 bytes here. This commit changes the
maximum number of sectors that can be read by the loader at once from
0x7f to 0x20, i.e. reading is done in 64kB blocks now.
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;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
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Загрузочный сектор для ОС Колибри (FAT12, дискета)
- Описание
Позволяет загружать KERNEL.MNT с дискет/образов
объёмом 1.44M, 1.68M, 1.72M и 2.88M
Для выбора объёма диска, для которого надо собрать
загрузочный сектор, необходимо в файле boot_fat12.asm
раскомментировать строку вида:
include 'floppy????.inc'
для необходимого объёма диска. Доступные варианты:
floppy1440.inc,
floppy1680.inc,
floppy1743.inc и floppy2880.inc
- Сборка
fasm boot_fat12.asm
- Для записи загрузочного сектора на диск/образ под Linux
можно воспользоваться следующей командой:
dd if=boot_fat12.bin of=288.img bs=512 count=1 conv=notrunc
---------------------------------------------------------------------
Floppy FAT12 boot sector for KolibriOS.
- Description
Allows booting KERNEL.MNT floppies/images
with volumes of 1.44M, 1.68M, 1.72M and 2.88M
To select the volume of the disk, which should gather
boot sector, it was necessary in file boot_fat12.asm
uncomment line:
include 'floppy????. inc'
for the necessary disk volume. Available options is:
floppy1440.inc,
floppy1680.inc,
floppy1743.inc and floppy2880.inc
- Compile
fasm boot_fat12.asm
- To write boot sector to the floppy/image under Linux
you can use the following command:
dd if=boot_fat12.bin of=288.img bs=512 count=1 conv=notrunc
Ivan Baravy
e633ea8eac