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Re: [Qemu-devel] [PATCH v3 1/9] fdc: take side count into account


From: Hervé Poussineau
Subject: Re: [Qemu-devel] [PATCH v3 1/9] fdc: take side count into account
Date: Fri, 27 Jan 2012 21:11:07 +0100
User-agent: Thunderbird 2.0.0.23 (Windows/20090812)

Markus Armbruster a écrit :
Hervé Poussineau <address@hidden> writes:

Floppies can be simple or double-sided. However, current code
was only taking the common case into account (ie 2 sides).

Impact?

This repairs single-sided floppies

Are single sided floppies broken before the patch? How?

Yes. For head > 0, wrong sector number is calculated, so data is read/written at wrong place on underlying block device.

Fortunately, mostly nobody is still using single-sided floppies (only some 360 kB floppies are single-sided), so bug has been neglected since a long time.

Hervé



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