Re: Can't get a Linux 3.6-rc zImage smaller than 2MB
On Wed, Sep 12, 2012 at 1:50 AM, Luke Kenneth Casson Leighton
<lkcl@lkcl.net> wrote:
> On Tue, Sep 11, 2012 at 9:46 PM, Maciej Soltysiak <maciej@soltysiak.com> wrote:
>> Hi,
>>
>> Was anyone successful in getting a 3.6-rc5 kernel zImage smaller than 2MB?
>> I'm trying to fit this onto SS4000-e and I've been failing desperately
>> for the last couple of days.
>
> isn't there a parameter which allows you to select the modules that
> go into an initrd? hmmm.... /etc/initramfs-tools/initramfs.conf -
> modules=most
I'm aiming to get the kernel under 2MB and initrd under 4MB and I have
initrd under 4MB.
It's just the kernel too big and I've been trying to move things out to modules
or remove completely. I honestly tried to keep things to a minimum.
> also it looks like you can specify COMPRESS=xz which, assuming you've
> enabled xz compression in the linux kernel, would give you a bit more
> space.
I've been setting LZMA, I'll try with XD then.
> also are you using busybox? again, that would likely save some
> space, esp. if you compiled it specially and *only* with the actual
> functions you need.
Busybox is enabled for initrams. For the kernel I don't think it makes
any difference if I'm using busybox or util-linux to invoke gcc
(arm-linux-gnueabi actually from emdebian.org), maybe that's the problem?
Is there a recommended cross_compiling chain?
> send a link to a file online where the list of files is, in the
> initrd - it will help check what's going on here.
Sure, initrd is here: http://pastebin.com/sdQhJxsn
Also, .config is here: http://pastebin.com/mvnkW2DD
> .... but, just for a laugh please do tell me the size of the kernel
> you've got. i remember doing 2.4.24 kernels and they were only 600k.
> we converted to 2.6.8 or thereabouts and that *immediately* shot up to
> 900k (exactly the same config options). hilarious. not.
I went down from whopping 5MB to 2.1MB
I also tried to use a .config file from
linux-image-3.2.0-3-iop32x_3.2.23-1_armel.deb
but during make it asked for a bunch of new stuff to which I said 'N'
and it's still is a big image.
Regards,
Maciej
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