Re: [poky] [PATCH] genericarm64.conf: set runqemu memory config to 512 Mb

[Mikko Rapeli <mikko.rapeli@linaro.org>]

Hi,

On Tue, Dec 23, 2025 at 12:28:00PM -0800, Khem Raj wrote:
> On Tue, Dec 23, 2025 at 12:25 AM Mikko Rapeli via lists.yoctoproject.org
> <mikko.rapeli=linaro.org@lists.yoctoproject.org> wrote:
> 
> > The genericarm64 initramfs is larger than 256 Mb which is
> > the default runqemu memory config and thus boot fails when
> > extracted initramfs does not fit.
> >
> > Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
> > ---
> >  meta-yocto-bsp/conf/machine/genericarm64.conf | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/meta-yocto-bsp/conf/machine/genericarm64.conf
> > b/meta-yocto-bsp/conf/machine/genericarm64.conf
> > index 5d1010e..ce22b17 100644
> > --- a/meta-yocto-bsp/conf/machine/genericarm64.conf
> > +++ b/meta-yocto-bsp/conf/machine/genericarm64.conf
> > @@ -57,6 +57,7 @@ QB_MACHINE ?= "-machine virt"
> >  QB_CPU ?= "-cpu cortex-a76"
> >  QB_CPU_KVM ?= "-cpu host -machine gic-version=3"
> >  QB_SMP ?= "-smp 4"
> > +QB_MEM ?= "-m 512"
> >
> 
> Some image recipes e.g. core-image-sato sets it conditionally like
> QB_MEM = '${@bb.utils.contains("DISTRO_FEATURES", "opengl", "-m 512", "-m
> 256", d)}'

You are right, this overrides the value:

# $QB_MEM [5 operations]
#   set? /home/builder/src/gpit/build/../meta-yocto/meta-yocto-bsp/conf/machine/genericarm64.conf:60
#     "-m 512"
#   set /home/builder/src/gpit/build/../core/meta/recipes-sato/images/core-image-sato.bb:18
#     "${@bb.utils.contains("DISTRO_FEATURES", "opengl", "-m 512", "-m 256", d)}"
#   set? /home/builder/src/gpit/build/../core/meta/classes-recipe/qemuboot.bbclass:96
#     "-m 256"
#   override[qemuarmv5]:set /home/builder/src/gpit/build/../core/meta/recipes-sato/images/core-image-sato.bb:19
#     "-m 256"
#   override[qemumips]:set /home/builder/src/gpit/build/../core/meta/recipes-sato/images/core-image-sato.bb:20
#     "-m 256"
# pre-expansion value:
#   "${@bb.utils.contains("DISTRO_FEATURES", "opengl", "-m 512", "-m 256", d)}"
QB_MEM="-m 256"

So 256 Mb without opengl in DISTRO_FEATURES.

But the problem solved by this patch is core-image-minimal or other images
which do not set QB_MEM at all and thus rely on defaults from qemuboot.bbclass or
runqemu and they don't work on genericarm64 with a large initramfs. With this
patch they work:

# $QB_MEM [2 operations]
#   set? /home/builder/src/gpit/build/../meta-yocto/meta-yocto-bsp/conf/machine/genericarm64.conf:60
#     "-m 512"
#   set? /home/builder/src/gpit/build/../core/meta/classes-recipe/qemuboot.bbclass:96
#     "-m 256"
# pre-expansion value:
#   "-m 512"
QB_MEM="-m 512"

> I wonder what happens with this change, will it get reset to 256 for
> qemuarm64 when not using opengl ?

I guess you meant genericarm64 since qemuarm64 is not affected by this.
So without "opengl" in DISTRO_FEATURES the 256 Mb is set which is not
ok but I don't know how to fix that atm. genericarm64 enables "opengl"
and I don't see a need to test genericarm64 without "opengl" support.

Cheers,

-Mikko