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Re: Firmware compression
On Sun, May 04, 2008 at 03:53:03PM +0100, Andrew Doran wrote:
> We have a meg or two of firmware images in the i386 GENERIC kernel, which is
> insane. I was thinking of adding a function that would use kmem_alloc+zlib
> to decompress images, and another to optionally free the decompressed image.
> It would probably also be good to add a simple program under dev/microcode
> to take a blob and spit out a compressed array in a C file.
Well, ignoring the zlib.c breakage it does the trick.
before: -rw-r--r-- 1 ad staff 151680 May 5 00:07 cz.o
after: -rw-r--r-- 1 ad staff 60568 May 5 00:07 cz.o
If we compress the firmware images down by 50%, remove PCIVERBOSE and
USBVERBOSE, and fix azalia_codec.c, I think it would take about 1.5MB
off an amd64 kernel.
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