what is bzimage?

1997-10-13 Thread David S. Zelinsky
I went to build a custom kernel with make-kpkg, and noticed the option
to build a `zimage' kernel, instead of `bzimage' kernel (the default).
But I can't find any documentation anywhere of what the difference is
between these two.  I've looked in the Kernel-HOWTO, and in all the
documentation in /usr/src/linux.

So, can someone explain what `bzimage' is, and why I might or might not
want it?  Thanks.


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   David S. Zelinsky
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Re: what is bzimage?

1997-10-13 Thread Scott Ellis


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On Mon, 13 Oct 1997, David S. Zelinsky wrote:

 I went to build a custom kernel with make-kpkg, and noticed the option
 to build a `zimage' kernel, instead of `bzimage' kernel (the default).
 But I can't find any documentation anywhere of what the difference is
 between these two.  I've looked in the Kernel-HOWTO, and in all the
 documentation in /usr/src/linux.
 
 So, can someone explain what `bzimage' is, and why I might or might not
 want it?  Thanks.

bzimage can be used for a larger kernel image than zimage.  Some old boot
loaders can't handle it (though the latest version of lilo and loadlin
can).  There is also a problem booting them on some laptops.  For the most
part, it doesn't matter though.


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Re: what is bzimage?

1997-10-13 Thread David S. Zelinsky

Scott K. Ellis [EMAIL PROTECTED] wrote:
 bzimage can be used for a larger kernel image than zimage.  Some old boot
 loaders can't handle it (though the latest version of lilo and loadlin
 can).  There is also a problem booting them on some laptops.  For the most
 part, it doesn't matter though.

Thanks.  But what is it?

If my limited understanding is correct, zimage is just a compressed copy of
the kernel image.  Is bzimage the same, but using a different (better)
compression algorithm?

And is this documented somewhere?


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   David S. Zelinsky
[EMAIL PROTECTED]
=-=-=-=-=-=-=-=-=-=-=-=


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Re: what is bzimage?

1997-10-13 Thread Bob Nielsen
On 13 Oct 1997, David S. Zelinsky wrote:

 
 Scott K. Ellis [EMAIL PROTECTED] wrote:
  bzimage can be used for a larger kernel image than zimage.  Some old boot
  loaders can't handle it (though the latest version of lilo and loadlin
  can).  There is also a problem booting them on some laptops.  For the most
  part, it doesn't matter though.
 
 Thanks.  But what is it?
 
 If my limited understanding is correct, zimage is just a compressed copy of
 the kernel image.  Is bzimage the same, but using a different (better)
 compression algorithm?

As the number of features has increased, kernels have gotten somewhat
larger.  There was a limit on the size of the compressed kernel with
zImage (I don't know what the limit was), and bzImage has a larger limit,
like 1 MB compressed (~2 MB uncompressed).  This started in 1.3.73.
 
 
 And is this documented somewhere?

Bits and pieces in /usr/src/linux/Documentation/Changes and the LILO and
LOADLIN documentation.  I believe it was more fully documented in the
later pre-2.0 kernel packages.

Bob


Bob Nielsen Internet: [EMAIL PROTECTED]
Tucson, AZ  AMPRnet:  [EMAIL PROTECTED]
http://www.primenet.com/~nielsen


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Re: what is bzimage?

1997-10-13 Thread Dale Scheetz
On Mon, 13 Oct 1997, David S. Zelinsky wrote:

 I went to build a custom kernel with make-kpkg, and noticed the option
 to build a `zimage' kernel, instead of `bzimage' kernel (the default).
 But I can't find any documentation anywhere of what the difference is
 between these two.  I've looked in the Kernel-HOWTO, and in all the
 documentation in /usr/src/linux.
 
 So, can someone explain what `bzimage' is, and why I might or might not
 want it?  Thanks.
 
There is a limit to the size of a zImage kernel (1 meg) which requires
changes to the bootload/compression that result in a bzimage (which can be
larger than 1 meg).
There are several ways you can construct a custom kernel that is below
the 1 meg and fit in a zImage. In the mean time, have you tried the tecra
kernel? It is in the disks-i386 directory under the tecra/ subdirectory.
You will find a drivers and rescue disk image there. Give it a try.

Luck,

Dwarf
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