--- In Christopher Friedt <>
wrote:
>
> Hi again everyone,
>
> Instead of cross-compiling these days, I've started using Qemu for
> native arm compilation. A cross compiler is still necessary to
build the
> kernel unless you use a pre-compiled one, like this:
>
> http://vaiprime.visibleassets.com/~cfriedt/zImage-versatile-2.6
>
>
Hi Christopher,
this is very interesting I have not got deeply into this yet but if
there was a good howto it would surely be helpful.
I use gentoo as my main dev system so if I could set up cross
compiling from there it would be great. Though I am going to need to
get more familiar with Debian anyway.
I had a look embedded gentoo , especially ARM a couple of weeks ago
and it looked rather dead. Have I missed where it's all happening?!
TIA.
> There is 1 shortcoming: it's generally not as fast as cross-
compilation.
> There are, however several more benefits:
>
> * no limitations on RAM except what your system has free (for
> compilations that take HUGE amounts of ram, like jikes compiling
the
> classpath)
> * no oddities when it comes to pkg-config dependencies
> * odd arch-dependent autoconf / automake things can be dealt with
easier.
>
> If anyone here would like to start compiling software this way, you
will
> need an arm kernel that works w/ Qemu (versatile PB), and a root
> filesystem. I'm using Gentoo's stage3 root filesystem for the arm
>
> Following the 'tinygentoo' methodology, I've built a gnu userland,
> uclibc userland, and am working now on a gnueabi userland, all
using
> stock ebuilds, or slightly modified ebuilds in my own portage
overlay.
> I've built several packages with ease, ranging from wireless tools,
to
> libc's.
>
> If anyone would be interested in collaborating on a good howto for
> cross-development of this nature, particularly using gentoo's
portage /
> ebuild system, I'm sure I could get the gentoo-embedded people to
post
> soemthing on their site.
>
> My Qemu command is here:
>
> qemu-system-arm -kernel zImage-versatile-2.6 -m 256 -M versatilepb
> -append "root=/dev/nfs nfsroot=192.168.7.1:/usr/
gentoo_root,port=2049
> ip=192.168.7.2:192.168.7.1:192.168.7.1:255.255.255.0:qemu" -net
> nic,macaddr=52:54:00:12:34:56,model=smc91c111 -net nic,vlan=0 -net
> tap,vlan=0,ifname=tap0,script=./qemu-ifup
>
> qemu-ifup looks like this:
> ================================================
> #!/bin/sh
>
> if [ "$(/sbin/ifconfig | grep $1)" != "" ]; then
> echo "shutting down old device $1"
> sudo ifconfig $1 down
> sleep 1
> tunctl -d $1
> sleep 1
> fi
>
> tunctl -t $1
> sleep 1
> sudo /sbin/ifconfig $1 up 192.168.7.1
> ================================================
>
> My kernel .config is here:
>
> http://vaiprime.visibleassets.com/~cfriedt/config-versatile-2.6
>
> On the first boot, you should always add 'init=/bin/sh' to append
above
> so that you can get around the default root password.
>
>
> ~/Chris
>
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