Looking for advise on debugging a non-boot kernel on qemu-system-sh4

[John Paul Adrian Glaubitz]

Hello!

I'm regularly building debian-installer packages for Debian's unofficial ports
which includes sh4 among others. The kernel package and therefore the installer
package contains a kernel for the SH7751R machine which is emulated by QEMU when
choosing the "r2d" type.

Unfortunately, I have not yet been able to boot a current kernel on 
qemu-system-sh4,
the screen remains blank and there are no error messages. Booting an older 2.6 
kernel
works just fine.

I'm using qemu-system-sh4 as follows:

$ qemu-system-sh4 -M r2d -kernel vmlinuz-2.6.32-5-sh7751r -initrd initrd.gz 
-hda debian.img \
  -append "root=/dev/sda1 console=tty0 noiotrap"

The old 2.6 kernel from [1] boots fine while the current 5.14.x kernel from [2] 
does
not produce any output.

Can anyone enlighten me what I might be missing?

Thanks,
Adrian

PS: Please CC me as I am subscribed without getting messages.

> [1] https://people.debian.org/~aurel32/qemu/sh4/
> [2] https://cdimage.debian.org/cdimage/ports/current-debian-installer/sh4/

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913