Re: [OE-core] [PATCH] u-boot: disable CONFIG_BLOBLIST on aarch64

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

Hi,

On Wed, May 21, 2025 at 04:14:04PM +0200, Quentin Schulz wrote:
> Hi Mikko,
> 
> On 5/21/25 3:51 PM, Mikko Rapeli via lists.openembedded.org wrote:
> > Booting on qemu with kvm is currently hanging on aarch64.
> > Root cause is in u-boot and CONFIG_BLOBLIST can be disabled
> > as a workaround.
> > 
> > To reproduce, build on kvm enabled host where "kvm-ok"
> > succeeds. For example genericarm64 machine and core-image-base
> > should then boot with:
> > 
> > $ runqemu slirp nographic novga snapshot kvm
> > 
> > Without this config workaround, the boot hangs without
> > any messages in qemu output but ctrl-a-c to qemu console
> > can shutdown the emulated machine.
> > 
> > This seems to have regressed after u-boot 2025.04 update.
> > KVM boot can be detected from speed, for example genericarm64
> > boots in 550 ms with KVM and without in over 5 seconds.
> > 
> > Fixes: [YOCTO #15872]
> > 
> > Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
> > Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
> > ---
> >   meta/recipes-bsp/u-boot/files/disable-CONFIG_BLOBLIST.cfg | 1 +
> >   meta/recipes-bsp/u-boot/u-boot-common.inc                 | 3 +++
> >   2 files changed, 4 insertions(+)
> >   create mode 100644 meta/recipes-bsp/u-boot/files/disable-CONFIG_BLOBLIST.cfg
> > 
> > diff --git a/meta/recipes-bsp/u-boot/files/disable-CONFIG_BLOBLIST.cfg b/meta/recipes-bsp/u-boot/files/disable-CONFIG_BLOBLIST.cfg
> > new file mode 100644
> > index 0000000000..d01d3d12d8
> > --- /dev/null
> > +++ b/meta/recipes-bsp/u-boot/files/disable-CONFIG_BLOBLIST.cfg
> > @@ -0,0 +1 @@
> > +# CONFIG_BLOBLIST is not set
> > diff --git a/meta/recipes-bsp/u-boot/u-boot-common.inc b/meta/recipes-bsp/u-boot/u-boot-common.inc
> > index fd1eab5cdd..d8c70da782 100644
> > --- a/meta/recipes-bsp/u-boot/u-boot-common.inc
> > +++ b/meta/recipes-bsp/u-boot/u-boot-common.inc
> > @@ -16,6 +16,9 @@ SRCREV = "34820924edbc4ec7803eb89d9852f4b870fa760a"
> >   SRC_URI = "git://source.denx.de/u-boot/u-boot.git;protocol=https;branch=master;tag=v${PV}"
> > +# workaround for aarch64 kvm qemu boot regression
> > +SRC_URI:append:aarch64 = " file://disable-CONFIG_BLOBLIST.cfg"
> > +
> 
> Can you make this qemu specific? I don't think we want every aarch64 board
> to have bloblist disabled?

True, at least qemu and genericarm64 need this. Or should this be tied
to some machine/distro feature or something else?

I guess KVM support is not a machine feature atm.

Cheers,

-Mikko