Re: [lfs-support] My finished LFS-7.10 x86-64 build

[Paul Rogers]

> I don't think gcc ever exports any gmp code into its output. Rather, gcc
> just uses gmp for its own internal purposes.

I don't think that's my concern.  My question is whether gcc will build
SSE-4.2 instructions into code just because the host can use them. 
Seems something like that happened--Conroes only have SSE-3.  AMD's
definition of x86-64 only goes up to SSE2!  I was hoping the
cross-compiling process we use might have prevented that.

> gcc only uses gmp under C compilation for optimization, then one might
> be able to get around an "incompatible-CPU-compiled" gmp if one
> disables gcc optimization:
> 
> CFLAGS='-O0'
> CXXFLAGS='-O0'
> 
> This might be helpful if you just need to recompile something (maybe even
> gmp itself) to rescue a "hosed" machine. Then, after gmp is working, you
> can recompile it again with normal optimizations.

This time the --build=x86_64-unknown-pc-linux (IIRC) worked for me, but
that may be something to add to the box on the GMP page in future
releases.  I'm going to ask LFS-dev to move that box up, before the
configure parameters.

> (If you ever try this, do let us know if it works as it might help
> someone out of a jam one day.)

OK, but it'll be next build.  It ain't broke no more, so I ain't fixing
it again.

> 
>   Cheers,
> 
>   Mike

Thanks, Mike
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Re: [lfs-support] bcmwl-kernel-source

[Tim Tassonis]

On July 6, 2017 7:56:02 PM Andrew Dance  wrote:


Hi all!

I've been tinkering with LFS on my Macbook Pro Retina and have managed to
get it booted up.  However, I'm having trouble getting my wifi card to work.

It's a Broadcom bcm4360.  There are 2 flavors, evidently.  Standard b43
drivers don't work on mine, so I have to use something called 'wl'.

On my Ubuntu installation, I did...

*apt-get install bcmwl-kernel-source*

and then followed with..

*modprobe wl*

This worked great for Ubuntu.

Questions is; how do I replicate this process in LFS without a package
manager like 'dpkg'

I tried unpacking the debian package but could make any sense of it.


This is how you unpack a dpkg:
mkdir tmp
cd tmp
ar xf ../your.pkg
tar xf data.*
tar xf control.*

Then you get some dirs with files, where stuff under usr,lib etc go exactly 
to the corresponding place in the filesystem. You might also get some 
postinst or prerm stuff, they are scripts that would be run at the 
appropriate action. If you are familiar with shell scripts, it's easy to 
find out what you have to do apart from copying files to the right place.


Cheers
Tim




Many thanks in advance.

Andrew



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Re: [lfs-support] bcmwl-kernel-source

[Ken Moffat]

On Thu, Jul 06, 2017 at 10:54:07AM -0700, Andrew Dance wrote:
> Hi all!
> 
> I've been tinkering with LFS on my Macbook Pro Retina and have managed to
> get it booted up.  However, I'm having trouble getting my wifi card to work.
> 
> It's a Broadcom bcm4360.  There are 2 flavors, evidently.  Standard b43
> drivers don't work on mine, so I have to use something called 'wl'.
> 
> On my Ubuntu installation, I did...
> 
> *apt-get install bcmwl-kernel-source*
> 
> and then followed with..
> 
> *modprobe wl*
> 
> This worked great for Ubuntu.
> 
> Questions is; how do I replicate this process in LFS without a package
> manager like 'dpkg'
> 
> I tried unpacking the debian package but could make any sense of it.
> 
> Many thanks in advance.
> 
> Andrew

Perhaps the suggestions at
https://wiki.archlinux.org/index.php/broadcom_wireless have
something to help (in particular, not building the upstream b43
drivers, or unloading them, if they really don't work).

There seem to be a lot of reports of failure with the upstream
drivers for broadcom on macs, so I assume that loading the required
firmware would probably be a waste of your time and you probably do
need the nonfree drivers from broadcom (linked from that wiki page).

An out-of-tree module needs to be compiled against the kernel on
which you wish to use it.  If you google for the Arch package source
files it should give some indication of how to compile it.

It seems that apple do their best to keep everybody within their
walled garden.

ĸen
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everything is a duck as far as I'm concerned.  -- Monstrous Regiment
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Re: [lfs-support] bcmwl-kernel-source

[Pierre Labastie]

On 06/07/2017 19:54, Andrew Dance wrote:

Hi all!

I've been tinkering with LFS on my Macbook Pro Retina and have managed 
to get it booted up.  However, I'm having trouble getting my wifi card 
to work.


It's a Broadcom bcm4360.  There are 2 flavors, evidently. Standard b43 
drivers don't work on mine, so I have to use something called 'wl'.


On my Ubuntu installation, I did...

/apt-get install bcmwl-kernel-source/

and then followed with..

/modprobe wl/
/
/
This worked great for Ubuntu.

Questions is; how do I replicate this process in LFS without a package 
manager like 'dpkg'


I'd suggest you go to http://www.broadcom.com/support/802.11/linux_sta.php,
then download the proper driver. The README at the bottom of the page 
has good instructions.
I guess you'll need to have your kernel source (compiled with your 
configuration) in a known location, like /usr/src.


I do not have a wireless card, so I cannot tell more...

Pierre
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Re: [lfs-support] My finished LFS-7.10 x86-64 build

[Michael Shell]

> So it must be the kernel's crypto functions tripping over it, and I
> can understand new instruction set evolutions wouldn't be
> backwards-compatible.  Still, if gcc weren't trying to embed those
> instructions in the kernel and were just setting the kernel up to use
> gmplib, it seems more likely they would be a runtime error.


  Paul,

I don't think gcc ever exports any gmp code into its output. Rather, gcc
just uses gmp for its own internal purposes.

I searched the net for why gcc needs gmp and found this:

https://stackoverflow.com/questions/15826628/why-does-gcc-require-gmp

which states that under C, gcc uses gmp for (1) constant calculations;
and (2) optimization calculations. So, if for the code to be compiled,
gcc only uses gmp under C compilation for optimization, then one might
be able to get around an "incompatible-CPU-compiled" gmp if one
disables gcc optimization:

CFLAGS='-O0'
CXXFLAGS='-O0'

This might be helpful if you just need to recompile something (maybe even
gmp itself) to rescue a "hosed" machine. Then, after gmp is working, you
can recompile it again with normal optimizations.

(If you ever try this, do let us know if it works as it might help someone
 out of a jam one day.)

However, it likely won't work if the code in question uses constant/macro
math because gcc uses gmp for that too.

In the case of your kernel compile failure:

> drivers/gpu/drm/i2c/ch7006_mode.c:51:3: internal compiler error: Illegal
> instruction
> NTSC_LIKE_TIMINGS,
>   ^

and in drivers/gpu/drm/i2c/ch7006_mode.c we find:

#define NTSC_LIKE_TIMINGS .vrefresh = 60 * fixed1/1.001,\
.vdisplay = 480,\
.vtotal = 525,  \
.hvirtual = 660

where fixed1 is defined in ch7006_priv.h to be:

#define fixed1 (1LL << 32)

where LL means "long long" (or 64 bits).

All gcc has to do here is to evaluate the .vrefresh constant. So, it seems
that gcc tried to use gmp to do the  "60 * (1LL << 32)/1.001" constant
calculation and this is what triggered the problem.


  Cheers,

  Mike
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[lfs-support] bcmwl-kernel-source

[Andrew Dance]

Hi all!

I've been tinkering with LFS on my Macbook Pro Retina and have managed to
get it booted up.  However, I'm having trouble getting my wifi card to work.

It's a Broadcom bcm4360.  There are 2 flavors, evidently.  Standard b43
drivers don't work on mine, so I have to use something called 'wl'.

On my Ubuntu installation, I did...

*apt-get install bcmwl-kernel-source*

and then followed with..

*modprobe wl*

This worked great for Ubuntu.

Questions is; how do I replicate this process in LFS without a package
manager like 'dpkg'

I tried unpacking the debian package but could make any sense of it.

Many thanks in advance.

Andrew
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