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Re: qemu broke booting of old RedHat floppies

From: Michael Tokarev
Subject: Re: qemu broke booting of old RedHat floppies
Date: Wed, 20 Jan 2021 19:02:51 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0

And one more followup to my own email.
As I didn't remember what's the std size of 144M floppy image
I weren't able to check, but the file size looked suspectably
for me at the very beginning. And indeed, std 144M floppy is
smaller than that. After truncating the file to 1440*1024 bytes
it works fine. The extra content seem not to belong to the image
itself and were added by something on the way to the archive
page.  So this issue ended up as being a non-issue.

One thing still bothers me:

  $ qemu-system-x86_64 \
   -drive file=RedHatLinuxBootDisk521998.disk1of1.img,if=none,id=d,format=raw \
   -device floppy,drive=d,type=144

But it fails:

  qemu-system-x86_64: -device floppy,drive=d,type=144: Insufficient permission 
to perform this operation

This same error message is returned after truncating the image
to 1440*1024 bytes. By current qemu 5.2. Why?



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