Problems with Debian PowerPC Big-Endian Host System

[William]

Hello,

I have an IBM POWER7 server with Debian-10.0-powerpc (big-endian) and 
qemu-system-x86 1:5.2+dfsg-10 powerpc installed on it. It's an 
standalone system (without HMC). I'm facing issues to set up memory 
higher than 2047MB on guest machines.

Command "qemu-system-x86_64 -machine type=q35 -m 2048" returns "at most 
2047 MB RAM can be simulated" and with parameters "-enable-kvm or 
accel=kvm" it returns "invalid accelerator kvm". Kvm module is loaded.

Any help would be much appreciated.

Thank you.

WIlliam.