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[Qemu-devel] [Bug 1840719] Re: win98se floppy fails to boot with isapc m


From: Philippe Mathieu-Daudé
Subject: [Qemu-devel] [Bug 1840719] Re: win98se floppy fails to boot with isapc machine
Date: Tue, 20 Aug 2019 09:29:24 -0000

Apparently the bisection result from comment #1 comes from a different
issue, the VGA display stays blank, can not test the floppy drive.

Bisecting using the pcbios.bin from fd646122418~, the VGA display stops
working at:

345c22aa80d1f6ddfe7898f721fd1be3bccb08f1 is the first bad commit
commit 345c22aa80d1f6ddfe7898f721fd1be3bccb08f1
Author: Gerd Hoffmann <address@hidden>
Date:   Fri Dec 18 12:01:12 2009 +0100

    roms: remove option rom packing logic
    
    Now that we load the option roms via fw_cfg, we can stop copying
    them to the 0xc000 -> 0xe000.  The patch does just that.
    
    Also the rom loader gets simplified as all remaining users of the
    rom loader load the bits at a fixed address so the packing and
    aligning logic can go away.

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https://bugs.launchpad.net/bugs/1840719

Title:
  win98se floppy fails to boot with isapc machine

Status in QEMU:
  New

Bug description:
  QEMU emulator version 4.1.50 (commit 50d69ee0d)

  floppy image from:
  https://winworldpc.com/download/417d71c2-ae18-c39a-11c3-a4e284a2c3a5

  $ qemu-system-i386 -M isapc -fda Windows\ 98\ Second\ Edition\ Boot.img
  SeaBIOS (version rel-1.12.1-0...)
  Booting from Floppy...
  Boot failed: could not read the boot disk

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