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[Qemu-devel] [Bug 1180923] Re: unused memory filled with 0x00 instead of


From: Battler
Subject: [Qemu-devel] [Bug 1180923] Re: unused memory filled with 0x00 instead of 0xFF
Date: Thu, 16 May 2013 17:45:18 -0000

Yeah, Qemu fills all bytes of the unused memory with 0x00 whereas it
should fill them with 0xFF. This causes DOS to incorrectly interpret
available memory as used by Option RAM, breaking the operation of
EMM386.EXE which then fails to find available upper memory. This also
causes problems with running Windows 3.x.

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https://bugs.launchpad.net/bugs/1180923

Title:
  unused memory filled with 0x00 instead of 0xFF

Status in QEMU:
  New

Bug description:
  Qemu, ever since it was made (so, since 2003), has this problem in DOS
  (either PC-DOS or MS-DOS and partly Windows 9x) not recognizing the
  memory available when the memory is filled with 0x00 but when it is
  filled with 0xFF it gets recognized properly, where should I patch
  qemu to solve this memory problem?

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