• Freebsd Compile Kernel Usb
• Freebsd Cross Compile Kernel
• Freebsd Compile Module Into Kernel
• Freebsd Kernel Source
• Freebsd Kernel Compile Time

Normally, the generic kernel that comes with default FreeBSD installations are good enough for most installations. But some machines that I worked on are having more then 4gb of memory. But some machines that I worked on are having more then 4gb of memory.

Freebsd Compile Kernel Usb

Is there any proper way to build a minimal kernel for FreeBSD? The FreeBSD Handbook has the lack of information about this. By default /boot/kernel directory has the pretty big size - around 450MB. I want to minimize kernel fingerprint and remove all unnecessary kernel modules and options. Should I use 'NO_MODULES' option in /etc/make.conf? Or use C compilation flags?

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2 Answers

There are a number of things you can do to reduce the size and number of files in /boot/kernel.

Possibly the best space saving is to be had by setting WITHOUT_KERNEL_SYMBOLS in /etc/src.conf (if this file doesn't already exist, just create it), and the next time you installkernel, the debug symbol files won't be installed. It's safe to delete them now, if you need the space immediately (rm /boot/kernel/*.symbols)

There are a few make.conf settings that control what modules are built:

• NO_MODULES - disable building of modules completely
• MODULES_OVERRIDE - specify the modules you want to build
• WITHOUT_MODULES - list of modules that should not be built

The NO_MODULES option is probably a bit too heavy-handed, so a judicious combination of the other two is a better choice. If you know exactly which modules you want, you can simply set them in MODULES_OVERRIDE. Note that WITHOUT_MODULES is evaluated afterMODULES_OVERRIDE, so any module named in both lists will not be built.

If you really want to suppress building of all modules, you can use NO_MODULES, and ensure that all required drivers and modules are statically compiled into the kernel. Each driver's manpage shows the appropriate lines to add to your kernel config file, so you should be able to figure out what you need.

How to determine bend allowance. If you still find that space is a problem, or if you just want to strip down the kernel as much as possible, you can edit your kernel config to remove any devices and subsystems your machine doesn't support, or which you are sure you won't want to use. The build system is pretty sensible, and if you inadvertently remove a module required by one still active in the config, you will get a failed build and an error message explaining what went wrong.

Although it can be extremely tedious, the best approach is to take small steps, removing one or two things at a time and ensuring that the resultant configuration both builds and boots correctly. Whatever you do, though, I highly recommend you make a copy of /usr/src/sys/<arch>/config/GENERIC, and edit the copy. If you ever get so muddled that the only recourse is to start from the default config, you'll be glad you've still got the GENERIC file on your system!

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In order to build your custom kernel, you can either pass the name of the config on the command line as make KERNCONF=MYKERNCONF buildkernel, or you can set KERNCONF in /etc/make.conf. Make sure you place the custom config file in /usr/src/sys/<arch>/config and the build system will be able to find it.

D_ByeD_Bye

'Proper' kernel is a relative notion and depends on your needs. People who need to ask about building kernel have no business building one. By the way how did you come up with the 450 MB size of FreeBSD kernel

here

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I want to add custom syscall to freebsd(school work). I google hundreds of time. there is no right solution for it.my homework is: 'Add custom syscall to freebsd kernel and recompile the kernel and use it'.finally I find that I should follow instructions in these two pages:

1 : http://www.onlamp.com/pub/a/bsd/2003/10/09/adding_system_calls.html

then

2: https://www.freebsd.org/doc/en/books/handbook/kernelconfig-building.html

will it shows errors in compile time:

I removed these three header include form my file then recompile it. now shows other errors like: MAXCPU undeclered in pcpu.h file.

what I missed? how can I do my school work?

NOTE: I use freebsd8 in vbox

Roland Smith

2 Answers

Look at what the error messages say; the files don't exist.

• The first include file is a typo; it's param.h, not parma.h!
• There is no kern.h. Maybe you mean sys/kernel.h?
• Idem for syscallargs.h. Do you perhaps mean syscall.h?

You can find header files with e.g:

Update: More important is determining which includes you actually need.

FreeBSD has pretty good documentation. If you want to use a kernel function or>33 gold badges3939 silver badges6363 bronze badges

Freebsd Cross Compile Kernel

Well take a look at share/examples/kld/syscall for a complete implementation as a module.

Adding a new file to teh kernel is left as an exercise for the reader.

Here is a hint: find the newest added file within kern/* subdir AND CHECK WHAT COMMITS WERE DONE TO MAKE IT COMPILE.

Freebsd Compile Module Into Kernel

In fact you could have done exactly the same with syscall: FIND THE NEWEST ADDED SYSCALL AND CHECK HOW IT WAS ACHIEVED.

All this is available in svn/git repository history.

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Freebsd Kernel Source

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