[LinuxBIOS] [Fastboot] Re: [Kboot-general] Re: small 64bit initrd
steve at nexpath.com
Sat Jan 14 21:40:08 CET 2006
Thanks hugely for the suggestions. I need ext3 since this build is also
used for rebuilding or fixing filesystems but you make a good point.
One of the errors that I made previously, and I appreciate everyone
pointing out that 2.6 was not necessarily larger than 2.4, is that I did
not carefully go down each tree in the menuconfig. At the time I did
not realize that 2.6 had so many options and buried menus.
I put in the linux-tiny patch for 2.6.14, and after working on the
config for an hour or so, I got it down to 1020K with gcc-3.3. Based on
Eric's suggestions, I took the same config and put it on a system with
gcc-4.0, put in the -Os option, and got a size of 814K! This is with
all I need in the kernel and the kexec option. If you recall my limit
is about 950K-960K so this is perfect. I am assuming the kexec tools
needs clib so I will have to splice this into busybox somehow but
hopefully it won't add too much.
I haven't made sure it all works yet, but it is close enough to start
debugging. Thanks tremendously for all the help.
Eric W. Biederman wrote:
>The two interesting pieces for your style of configuration are:
>1) The -Os work that has been going on recently, I think I have
> heard 10% reduction for that.
>2) Careful selection of which compiler you are using as that makes
> a noticeable difference.
>3) Look under CONFIG_EMBEDDED and possibly elsewhere for options
> you don't need and can turn off. CONFIG_EMBEDDED also has some
> smaller alternatives for some of the common features.
>You might also grab ext2 instead of ext3. When clean either will
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