[Bug 1596832] Re: e500 -bios/-kernel broken with big images

From: Thomas Huth <1596832@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1596832] Re: e500 -bios/-kernel broken with big images
Date: Thu, 22 Apr 2021 05:13:33 -0000	[thread overview]
Message-ID: <161906841386.32404.14124644574995656107.malone@soybean.canonical.com> (raw)
In-Reply-To: 20160628075027.23593.17849.malonedeb@gac.canonical.com

The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1596832

Title:
  e500 -bios/-kernel broken with big images

Status in QEMU:
  Incomplete

Bug description:
  This is tested using qemu 2.4.1, but it looks like the code
  qemu/hw/ppc/e500.c has not changed since. This looks like the source
  of the problem:
  http://git.qemu.org/?p=qemu.git;a=commitdiff;h=3812c71ffaa2cf733c3087792b859fef30b7545f

  What works:
  ----------

  Basic invocation qemu-system-ppc -machine ppce500  -monitor stdio
  -bios u-boot.e500 works, I get the uboot prompt and this:

  (qemu) info roms
  addr=0000000000f00000 size=0x044b8c mem=ram name="phdr #0: .../qemu/share/qemu/u-boot.e500"
  addr=0000000000f81000 size=0x006b00 mem=ram name="phdr #1: .../qemu/share/qemu/u-boot.e500"

  Passing u-boot.e500 image as kernel (-bios u-boot.e500 -kernel u-boot.e500) appears to work, $qemu_kernel_addr is filled in, though (as expected) uboot complains about the image format.

  (qemu) info roms
  addr=0000000000f00000 size=0x044b8c mem=ram name="phdr #0: .../qemu/share/qemu/u-boot.e500"
  addr=0000000000f81000 size=0x006b00 mem=ram name="phdr #1: .../qemu/share/qemu/u-boot.e500"
  addr=0000000002000000 size=0x054e8c mem=ram name=".../qemu/share/qemu/u-boot.e500

  What doesn't work:
  -----------------

  However, once I try to load a big image (>=32 MiB), uboot doesn't even
  show anything:

  qemu-system-ppc -machine ppce500  -monitor stdio -bios u-boot.e500
  -kernel boot/vmlinux -m 1024

  (qemu) info roms
  addr=0000000000f00000 size=0x044b8c mem=ram name="phdr #0: .../qemu/share/qemu/u-boot.e500"
  addr=0000000000f81000 size=0x006b00 mem=ram name="phdr #1: .../qemu/share/qemu/u-boot.e500"
  addr=0000000002000000 size=0x27aeedc mem=ram name="boot/vmlinux"

  ...
  (gdb) bt
  #0  0x00f2efcc in ?? ()
  #1  0x00f31554 in ?? ()
  #2  0x00f03f4c in ?? ()
  #3  0x00f04458 in ?? ()
  #4  0x00f028dc in ?? ()
  #5  0x00f01080 in ?? ()

  The thing is, this used to work +- before the commit, where I'd just
  pass the image as -kernel option, and it booted.

  If I do that now (w/o the -bios option, using the exact same image), the kernel gets loaded twice, only at different addresses (the cause is obvious from the commit), causing overlap error:

  qemu-system-ppc -machine ppce500  -monitor stdio  -kernel boot/vmlinux -m 1024
  QEMU 2.4.1 monitor - type 'help' for more information
  (qemu) rom: requested regions overlap (rom boot/vmlinux. free=0x00000000027492fc, addr=0x0000000002000000)

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