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Updated stage3 for ppc7450 (most g4) apple systems
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rbshep78
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PostPosted: Fri Jan 26, 2018 11:39 am    Post subject: Updated stage3 for ppc7450 (most g4) apple systems Reply with quote

Hi folks,

I've used gentoo before but been away from it for a while. I was trying to get it running on apple g4 systems, and i've had some success.

But i noticed the stage3 tarballs for ppc are a bit out of date. So here's a link to a tarball on my dropbox that i compiled a couple of months ago.

https://www.dropbox.com/sh/wk6b2b0iovzdhyb/AAALTgUtxcJ-3DqaoL2wBnL-a?dl=0

I updated the CFLAGS for ppc7450 class cpu's, switched the compiler to gcc-6.4.0, and emerged world again (to make sure everything was linked against the latest library versions).

There is also a kernel tarball (containing kernel / initramfs / modules) if you wish to use it. Please note that when extracting this, all paths are relative to your root (or chroot ;) ) mount point.

Hopefully someone will find it useful to save them compile time when starting from scratch on a similar system. Thanks to the gentoo community :)
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gray227
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PostPosted: Mon Jan 29, 2018 1:36 pm    Post subject: Reply with quote

Thats very handy indeed :D

Got a G4 here I wanted to put gentoo on and this will speed up how long it takes to update as like you mention, the ppc stage3's are quite a bit out of date.
Just done one on a G5 and took a long time. :wink:

Many thanks rbshep78 :D
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schwarzygesetzlos
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PostPosted: Sat Feb 10, 2018 9:20 am    Post subject: Reply with quote

Very helpful indeed! Is this already the new 17.0 profile?
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rbshep78
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PostPosted: Mon Apr 02, 2018 9:14 am    Post subject: Reply with quote

schwarzygesetzlos wrote:
Very helpful indeed! Is this already the new 17.0 profile?


Thanks :) No it's still the 13.0 profile...however, i'm going to try building a base tarball with the 17.0 profile, hopefully should be uploaded by next week
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rbshep78
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PostPosted: Wed Apr 04, 2018 2:57 pm    Post subject: Reply with quote

https://www.dropbox.com/sh/wk6b2b0iovzdhyb/AAALTgUtxcJ-3DqaoL2wBnL-a?dl=0

New files:

stage3-ppc7450-17.0-20180404.tar.bz2
kernel-ppc-4.15.5-gentoo.tar.bz2

- Changed to 17.0 profile, gcc updated to 6.4.0-r1
- Kernel sucessfully boots Mac Mini G4 (PowerMac 10,1)
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legacy
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PostPosted: Sun Apr 08, 2018 4:03 pm    Post subject: Reply with quote

gcc v7.3.0 works here (7.3.0-r1)
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rbshep78
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PostPosted: Fri Apr 13, 2018 5:38 pm    Post subject: Reply with quote

Thanks, will try updating gcc later. Currently playing with qemu-system-ppc on my in-hell i5 desktop ;)

Just noticed i made a mistake - kernel is 4.15.15 so have renamed tarball to kernel-ppc-4.15.15-gentoo.tar.bz2
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rbshep78
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PostPosted: Mon Apr 16, 2018 12:02 pm    Post subject: Reply with quote

https://www.dropbox.com/sh/wk6b2b0iovzdhyb/AAALTgUtxcJ-3DqaoL2wBnL-a?dl=0

New file:

kernel-ppc-4.14.34-gentoo.tar.bz2

For those who prefer an LTS kernel
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rbshep78
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PostPosted: Thu Jul 12, 2018 5:38 pm    Post subject: Reply with quote

https://www.dropbox.com/sh/wk6b2b0iovzdhyb/AAALTgUtxcJ-3DqaoL2wBnL-a?dl=0

New file:

stage3-ppc7450-20180711.tar.bz2

- Based on May 5th 2018 stage3
- Added 'altivec' USE flag
- Still using gcc 6.4.0 (and have masked higher versions) as i couldn't get a 4.14.* (LTS) kernel to compile under GCC 7.3.0

Hopefully new 4.14 series kernel to come in the next few days
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schwarzygesetzlos
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PostPosted: Sat Jul 21, 2018 9:14 pm    Post subject: Reply with quote

rbshep78 wrote:

- Still using gcc 6.4.0 (and have masked higher versions) as i couldn't get a 4.14.* (LTS) kernel to compile under GCC 7.3.0

Hmm, interesting... I've been building & running kernels from 4.14.* up to 4.18-rc* with gcc 7.3.0 since quite a while. Though only on a G5 (still 32bit userland), and not on my PowerBook G4.

Where does gcc 7.3.0 fail at building the kernel?
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rbshep78
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PostPosted: Sun Oct 07, 2018 4:00 pm    Post subject: gentoo-sources-4.14.74 fails to compile on gcc 7.3.0 / ppc32 Reply with quote

Thanks for the reply schwarzygesetzlos and sorry it's taken a while to come back to you.

I was pleasantly surprised to find new stage3 ppc 32bit tarballs being built. However, they now contain gcc 7.3.0-r3 :(

Here's what goes wrong when i try to compile gentoo-sources-4.14.74 :

Code:

  CC      arch/powerpc/kernel/kvm.o
In file included from ./arch/powerpc/include/uapi/asm/kvm_para.h:82:0,
                 from ./arch/powerpc/include/asm/kvm_para.h:22,
                 from ./include/uapi/linux/kvm_para.h:33,
                 from ./include/linux/kvm_para.h:5,
                 from ./include/linux/kvm_host.h:33,
                 from arch/powerpc/kernel/kvm.c:22:
arch/powerpc/kernel/kvm.c: In function ‘kvm_guest_init’:
./arch/powerpc/include/asm/epapr_hcalls.h:470:42: error: ‘in’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r3 asm("r3") = in[0];
                                        ~~^~~
./arch/powerpc/include/asm/epapr_hcalls.h:471:25: error: ‘*((void *)&in+4)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r4 asm("r4") = in[1];
                         ^~
./arch/powerpc/include/asm/epapr_hcalls.h:472:25: error: ‘*((void *)&in+8)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r5 asm("r5") = in[2];
                         ^~
./arch/powerpc/include/asm/epapr_hcalls.h:473:25: error: ‘*((void *)&in+12)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r6 asm("r6") = in[3];
                         ^~
./arch/powerpc/include/asm/epapr_hcalls.h:474:25: error: ‘*((void *)&in+16)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r7 asm("r7") = in[4];
                         ^~
./arch/powerpc/include/asm/epapr_hcalls.h:475:25: error: ‘*((void *)&in+20)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r8 asm("r8") = in[5];
                         ^~
./arch/powerpc/include/asm/epapr_hcalls.h:476:25: error: ‘*((void *)&in+24)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r9 asm("r9") = in[6];
                         ^~
./arch/powerpc/include/asm/epapr_hcalls.h:477:25: error: ‘*((void *)&in+28)’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  unsigned long register r10 asm("r10") = in[7];
                         ^~~
cc1: all warnings being treated as errors
make[1]: *** [scripts/Makefile.build:329: arch/powerpc/kernel/kvm.o] Error 1
make: *** [Makefile:1039: arch/powerpc/kernel] Error 2


Any ideas on how to fix this?
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schwarzygesetzlos
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PostPosted: Wed Oct 17, 2018 1:34 pm    Post subject: Reply with quote

Do you really need KVM on your Mac Mini G4? I don't seem to have it set on my G5, which runs fine without it. Also you could try a more recent kernel, like the 4.18.x series.
Code:
T800 /usr/src/linux # grep -i kvm .config
# CONFIG_KVM_GUEST is not set

Try disabling it. If you need it and it won't build after you updated Gentoo and rebuilt the whole toolchain with gcc-7.3.0 you should file a bug at https://bugzilla.kernel.org/enter_bug.cgi regarding "Platform Specific/Hardware".
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