[Freedos-kernel] removing functions?

[Roy]

Hello list,

Is there any guide that can help on compiling custom kernel with less-used
function(for example, NLS functions) removed/stubified?

Regards,
Roy

[Eric Auer]

Hi Roy,

Post by Roy
Is there any guide that can help on compiling custom kernel with less-used
function(for example, NLS functions) removed/stubified?

Well FAT32 is a compile time option and I think RayeR made
a slightly stripped kernel for his "DOS in your flash BIOS
chip" micro... ehh... distro, but there is no one size fits
all answer to your question. If you can make a list of the
things you want to remove, then people on this list could
tell you how much size difference it would make and how bad
of a hack removing those functions would be :-) Note that
you do not want to spend much effort for this: Most users
have much bigger disks and with DOS extenders and already
by simply having DOS=HIGH in the HMA, kernel size is not
an issue anyway. Also, the FreeDOS kernel is designed to
be nice and small compared to the big feature set... :-)

Regards, Eric

[Roy]

Post by Eric Auer
Hi Roy,

Post by Roy
Is there any guide that can help on compiling custom kernel with less-used
function(for example, NLS functions) removed/stubified?

Well FAT32 is a compile time option and I think RayeR made
a slightly stripped kernel for his "DOS in your flash BIOS
chip" micro... ehh... distro, but there is no one size fits
all answer to your question. If you can make a list of the
things you want to remove, then people on this list could
tell you how much size difference it would make and how bad
of a hack removing those functions would be :-) Note that
you do not want to spend much effort for this: Most users
have much bigger disks and with DOS extenders and already
by simply having DOS=HIGH in the HMA, kernel size is not
an issue anyway. Also, the FreeDOS kernel is designed to
be nice and small compared to the big feature set... :-)

If I want to remove fdconfig.sys support, break, numlock, echo, switches,
country, HLT idle, and menus in CONFIG.SYS options,
and hardcoded NLS page, and all NLS stuff(replaced with stub)

How much I can shrink?

Post by Eric Auer
Regards, Eric
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[Tom Ehlert]

Post by Roy
If I want to remove fdconfig.sys support, break, numlock, echo, switches,
country, HLT idle, and menus in CONFIG.SYS options,
and hardcoded NLS page, and all NLS stuff(replaced with stub)
How much I can shrink?

a) how much of what?
filesize of kernel.sys? resident memory used?


b) take a look at kernel.map. *all* of NLS is ~500 byte
probably 500 byte for menus etc., maybe 1K

after compression, probably less then 1 K reduction in filesize.

certainly not worth the trouble or even worth talking about


Tom