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[Qemu-devel] What is qemu-system-ppcemb for?
From: |
Rob Landley |
Subject: |
[Qemu-devel] What is qemu-system-ppcemb for? |
Date: |
Tue, 23 Feb 2010 15:37:16 -0600 |
User-agent: |
KMail/1.11.2 (Linux/2.6.28-18-generic; KDE/4.2.2; x86_64; ; ) |
The qemu-system-ppcemb binary has the same -M and -cpu options as qemu-system-
ppc. The default-configs/*.mak files are identical for ppc-softmmu.mak and
ppcemb-softmmu.mak. The ppc-softmmu/config-target.mak matches the one in
ppcemb-softmmu. The "config-target.mak" files differ, but just in the names.
I looked at the source code and hw/ppc.c shows "Embedded PowerPC timers" for
things like cpu_4xx_fit_cb(), but those seem to be used by the standard qemu-
system-ppc...
So far the only actual difference I've tracked down is that target-ppc/cpu.h
is setting TARGET_PAGE_BITS to 10 (for 1k pages) instead of 12 (4k pages)...
except it's not doing that for CONFIG_USER_ONLY...? (For KVM, it's assuming a
ppc4xx CPU by default, but I'm not using kvm.)
I tried booting my ppc image with qemu-system-ppcemb instead and it hung, so
something's different. Presumably that page size thing...
Has anybody actually used ppcemb for anything? Is there a Linux config or it?
I've been building a powerpc4xx system image, but booting it under g3beige
because last I checked qemu doesn't emulate a 4xx processor? (It has a bamboo
board, but only lets you use it under kvm...)
Confused,
Rob
--
Latency is more important than throughput. It's that simple. - Linus Torvalds
- [Qemu-devel] What is qemu-system-ppcemb for?,
Rob Landley <=