[yocto] x86-64 with -mx32 option?

[Paul D. DeRocco]

Has anyone successfully used Yocto to build a Linux system for a 64-bit
Intel processor using the -mx32 compiler option, forcing all long and
pointer types to 32 bits? I've got an embedded system with a gig of RAM
and I'd like to have access to the larger register set (especially SSE) of
64-bit mode, but suspect that using 32-bit pointers might speed things up
a bit, by saving cache space.

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Ciao,   Paul D. DeRocco
Paulmailto:pdero...@ix.netcom.com

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Re: [yocto] [meta-raspberrypi][PATCH v5 3/4] linux-raspberrypi-base.bbclass: support for .dtbo files for dtb overlays

[Francois Muller]

Hi Hervé,
I haven't tested your patch yet, but while reviewing the diff I'm a
bit surprised about this:
>  overlays = oe.utils.str_filter_out('\S+\-overlay\.dtb$', > dts
, d)
> +overlays = oe.utils.str_filter_out('\S+\.dtbo$', > overlays,
> d)
Shouldn't .dtbo files be filtered out from 'dts' instead of 'overlays'
in the added line?
Seems like a typo to me.
BR,
François
Le vendredi 17 juin 2016 à 23:35 +0800, Herve Jourdain a écrit :
> Kernel 4.4.6+ on RaspberryPi support .dtbo files for overlays,
> instead of .dtb.
> Add support for both variants of overlays ("-overlay.dtb" and
> ".dtbo")
> Change which variant needs to be supported based on the kernel
> version
> 
> CAUTION: when called from IMAGE_CMD_rpi-sdimg, 'TMPDIR' is not set,
> causing 'STAGING_KERNEL_BUILDDIR' to not be expanded, causing
> get_kernelversion_file() to fail!
> To avoid this problem, get_dts() and split_overlays() MUST be called
> with the kernel version parameter set, when called from
> IMAGE_CMD_rpi-sdimg!
> 
> Signed-off-by: Herve Jourdain 
> ---
>  classes/linux-raspberrypi-base.bbclass | 19 ---
>  1 file changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/classes/linux-raspberrypi-base.bbclass b/classes/linux-
> raspberrypi-base.bbclass
> index 40beef1..930fc44 100644
> --- a/classes/linux-raspberrypi-base.bbclass
> +++ b/classes/linux-raspberrypi-base.bbclass
> @@ -1,7 +1,8 @@
>  inherit linux-kernel-base
>  
> -
>  def get_dts(d, ver):
> +import re
> +
>  staging_dir = d.getVar("STAGING_KERNEL_BUILDDIR", True)
>  dts = d.getVar("KERNEL_DEVICETREE", True)
>  
> @@ -20,20 +21,24 @@ def get_dts(d, ver):
>  
>  # Always turn off device tree support for kernel's < 3.18
>  try:
> -if int(min_ver[0]) <= 3:
> -if int(min_ver[1]) < 18:
> -dts = ""
> +if int(min_ver[0]) >= 4:
> +if (int(min_ver[1]) < 4) or (int(min_ver[1]) == 4 and
> int(min_ver[2]) < 6):
> +dts = ' '.join([(re.sub(r'(.*)\.dtbo$', r'\1-
> overlay.dtb', x)) for x in dts.split()])
> +elif int(min_ver[1]) < 18:
> +dts = ""
>  except IndexError:
>  min_ver = None
>  
>  return dts
>  
>  
> -def split_overlays(d, out):
> -dts = get_dts(d, None)
> +def split_overlays(d, ver, out):
> +dts = get_dts(d, ver)
>  if out:
>  overlays = oe.utils.str_filter_out('\S+\-overlay\.dtb$',
> dts, d)
> +overlays = oe.utils.str_filter_out('\S+\.dtbo$', overlays,
> d)
>  else:
> -overlays = oe.utils.str_filter('\S+\-overlay\.dtb$', dts, d)
> +overlays = oe.utils.str_filter('\S+\-overlay\.dtb$', dts, d)
> + \
> +   " " + oe.utils.str_filter('\S+\.dtbo$', dts, d)
>  
>  return overlays
> -- 
> 2.7.4
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Re: [yocto] what other layers make extensive use of "UBOOT_CONFIG[...] = "?

[Andrea Galbusera]

Hi,

On Sat, Jun 25, 2016 at 11:02 AM, Robert P. J. Day
 wrote:
>
>   was looking for docs on proper usage of the UBOOT_CONFIG[sd]
> construct and other variations (doesn't seem to be a lot), and noticed
> that while the meta-fsl-{arm,ppc} layers make extensive use of this
> feature, i don't see much more of that across the other layers i have
> checked out.
>
>   are there any other layers that use the UBOOT_CONFIG[] to any
> extent? thanks.

i.e. meta-altera [1] does... See the machine conf files it provides.

[1] https://github.com/kraj/meta-altera
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[yocto] what other layers make extensive use of "UBOOT_CONFIG[...] = "?

[Robert P. J. Day]

  was looking for docs on proper usage of the UBOOT_CONFIG[sd]
construct and other variations (doesn't seem to be a lot), and noticed
that while the meta-fsl-{arm,ppc} layers make extensive use of this
feature, i don't see much more of that across the other layers i have
checked out.

  are there any other layers that use the UBOOT_CONFIG[] to any
extent? thanks.

rday

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Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca

Twitter:   http://twitter.com/rpjday
LinkedIn:   http://ca.linkedin.com/in/rpjday


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