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[Qemu-devel] [Bug 1481750] Re: qemu-system-ppc hangs when running -M ppc


From: Andreas Rasmusson
Subject: [Qemu-devel] [Bug 1481750] Re: qemu-system-ppc hangs when running -M ppce500 -bios u-boot.e500
Date: Wed, 05 Aug 2015 18:21:23 -0000

It is not qemu that hangs. 
The u-boot.e500 software falls into an eternal loop at the addresses 0x00f1f964 
to 0x00f1f94c
due to the registers r9 and r10 (both) being 0x0 in the newer versions and 0x40 
in the working 2.2.1 version.  

Howerver, those values ought to have originated from the qemu
environment somehow.

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https://bugs.launchpad.net/bugs/1481750

Title:
  qemu-system-ppc hangs when running  -M ppce500 -bios u-boot.e500

Status in QEMU:
  New

Bug description:
  On recent qemu versions (tested on locally built versions 2.3.50 and 2.3.93)
  the command below causes qemu to hang before the u-boot command prompt is 
reached.
  However in an older version (2.2.1) the u-boot bootprompt is reached and can 
be typed into,
  so apparenly something has broken along the way.

  
  ppc-softmmu/qemu-system-ppc -d guest_errors -d in_asm -M ppce500 -nographic 
-bios pc-bios/u-boot.e500

  
  From the -d in_asm argument you can compare the runs and the 2.2.1 version
  outputs a lot more.

  ------
  - I use the unmodified u-boot.e500 that is inlcuded with each respective 
version.
  - when building qemu my configure paramters were in all three cases :
  './configure' '--target-list=ppc-softmmu,arm-softmmu' '--audio-drv-list=' 
'--enable-debug'

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