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ARM: change of CHOST in /etc/make.conf
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coRpTitan
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PostPosted: Wed Feb 15, 2012 12:14 pm    Post subject: ARM: change of CHOST in /etc/make.conf Reply with quote

Hello,

I'm preparing Gentoo OS for new device(will be based on arm1176jzf-s CPU).
I've created QEMU with this CPU:
Code:
qemu-system-arm -kernel gentoo_kernel -M versatilepb -cpu arm1176 -hda rootfs.ext4 -hdb swap.swap -m 256 -append "root=/dev/sda loglevel=7" -serial stdio


Then I installed following stage3: armv5tel. I know that my CPU is armv6, but when I used armv6 stage3 machine didn't booted up. So I decided to use stage3 for armv5tel and change CHOST as well as CLAGS to compile it for my CPU.

My problem is that when I change some values in /etc/make.conf and run emerge --info it still shows me old values. When I do the same on Gentoo machine where I have i686 and put into /etc/make.conf for example i999 and run emerge --info then it will print me new value(999) for CHOST.

Is there any specific procedure how I can change CHOST on ARM architecture? Do I need to execute some special command to apply changes I made to /etc/make.conf on ARM?

P.S.: I was following: http://www.gentoo.org/doc/en/change-chost.xml and there is only mentioned to edit /etc/make.conf and then re-compile gcc,binutils,glibc.

Thank you for help.
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jannis
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PostPosted: Mon Feb 27, 2012 10:11 am    Post subject: Reply with quote

Let me guess: Raspberry Pi?
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xaviermiller
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PostPosted: Mon Feb 27, 2012 11:20 am    Post subject: Reply with quote

Hello,

The CHOST change is only valable for compatible architectures (e.g. switching from a i386 to a i686, or changing the vendor tag). I don't know if it would work for ARM architectures.

IMHO the best way is to create a new cross-compile environment and cross-build a simple chroot.
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fikiz
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PostPosted: Tue Feb 28, 2012 11:27 am    Post subject: Reply with quote

coRpTitan,

may I ask you how did you compile the kernel for qemu?
I was able to compile a kernel chroot-ing into a gentoo stage3-armv4tl following this guide:
http://www.gentoo.org/proj/en/base/embedded/handbook/?part=1&chap=5

But qemu-system-arm won't boot my kernel, and I'm thinking I've chosen some wrong kernel options.
Could you show me your .config file?

thanks.
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coRpTitan
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PostPosted: Sat Mar 10, 2012 8:06 am    Post subject: Reply with quote

jannis wrote:
Let me guess: Raspberry Pi?


Correct :]

fikiz:

Basically I've been following this example: http://www.cnx-software.com/2011/10/18/raspberry-pi-emulator-in-ubuntu-with-qemu/
Differences were: I used emerge to get qemu, not downloading sources manually and install.

Kernel config is here: https://data.tntwrk.info/rasp_config
If you want to use this one, be sure you will modify at least CONFIG_CROSS_COMPILE - this is where I have stored my cross compile tools.
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jannis
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PostPosted: Fri May 11, 2012 6:58 pm    Post subject: Reply with quote

I got mine today:
http://forums.gentoo.org/viewtopic-t-878755.html#p7035498
I'm using the gentoo userspace with the kernel shipped with the arch-image currently. I got my compiled kernel to run but ethernet-driver doesn't work ... :/
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