File:  [NetBSD Developer Wiki] / wikisrc / guide / inst-media.mdwn
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inst-media Guide -> wiki

    1: # Building NetBSD installation media
    2: 
    3: ## Creating custom install or boot floppies for your architecture e.g. i386
    4: 
    5: Sometimes you may want to create your own boot or install floppies for i386
    6: instead of using the precompiled ones, or tailor the ones built by the NetBSD
    7: build system. This section outlines the steps to do so.
    8: 
    9: The overall idea is to have a filesystem with some tools (sysinst, ls,
   10: whatever), and embed this filesystem as some sort of ramdisk into a NetBSD
   11: kernel. The kernel needs to include the `md` pseudo device to be able to hold a
   12: ramdisk. The kernel with the ramdisk can then be put on removable media or made
   13: available via the net (using NFS or TFTP).
   14: 
   15: To perform the following steps, you need to be running a kernel with the `vnd`
   16: pseudo device enabled (this is the default for a GENERIC kernel).
   17: 
   18:  1. First, you must create a valid kernel to put on your floppies, e.g.
   19:     INSTALL. This kernel must include the `md` pseudo device, which allows
   20:     embedding a ramdisk. See [[Compiling the kernel|guide/kernel]] for kernel
   21: 	building instructions.
   22: 
   23:  2. The next step is to create the ramdisk that gets embedded into the kernel.
   24:     The ramdisk contains a filesystem with whatever tools are needed, usually
   25: 	[init(8)](http://netbsd.gw.com/cgi-bin/man-cgi?init+8+NetBSD-5.0.1+i386) and
   26:     some tools like sysinst,
   27: 	[ls(1)](http://netbsd.gw.com/cgi-bin/man-cgi?ls+1+NetBSD-5.0.1+i386), etc.
   28: 	To create the standard ramdisk, run `make` in the
   29:     `src/distrib/i386/ramdisks/ramdisk-big` directory (for NetBSD 3.x:
   30:     `src/distrib/i386/floppies/ramdisk-big`).
   31: 
   32: 	This will create the `ramdisk.fs` file in the directory. If you want to
   33: 	customize the contents of the filesystem, customize the `list` file.
   34: 
   35:  3. Now, the ramdisk gets inserted into the kernel, producing a new kernel which
   36:     includes the ramdisk, all in one file. To do so, change into the
   37:     `src/distrib/i386/instkernel` directory (for NetBSD 3.x:
   38:     `src/distrib/i386/floppies/instkernel`) and run `make`.
   39: 
   40:  4. The next step is to make one or more floppy images, depending on the size of
   41:     the kernel (including the ramdisk). This is done by changing into
   42:     `/usr/src/distrib/i386/floppies/bootfloppy-big`, and running `make` again.
   43: 
   44: 	This will create one or two (depending on the size of kernel) files named
   45: 	`boot1.fs` and `boot2.fs`
   46: 
   47:  5. Last, transfer these files to the floppies with the commands
   48: 
   49:         # dd if=boot1.fs of=/dev/fd0a bs=36b
   50:         # dd if=boot2.fs of=/dev/fd0a bs=36b
   51: 
   52:  6. Put the first floppy in the drive and power on!
   53: 
   54: ## Creating a custom install or boot CD with build.sh
   55: 
   56: Creating custom install or boot CDs is easy with `build.sh`. The NetBSD base
   57: system includes the
   58: [makefs(8)](http://netbsd.gw.com/cgi-bin/man-cgi?makefs+8+NetBSD-current)
   59: tool for creating filesystems. This tool is used to create iso-images. Creating
   60: iso-images includes these tasks:
   61: 
   62:  1. Release build
   63: 
   64:         #./build.sh release
   65: 
   66:  2. CD-ROM iso-image build
   67: 
   68:         #./build.sh iso-image
   69: 
   70: The `build.sh` iso-image command will build a CD-ROM image in
   71: `RELEASEDIR/MACHINE/installation`
   72: 
   73: **Warning**: For now not all architectures are supported. The mac/68k ports
   74: doesn't boot for now.
   75: 

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