From: Gerd Hoffmann <kraxel@redhat.com>
To: Laszlo Ersek <lersek@redhat.com>
Cc: Ray Ni <ray.ni@intel.com>,
qemu devel list <qemu-devel@nongnu.org>,
edk2-devel-01 <edk2-devel@lists.01.org>,
Markus Armbruster <armbru@redhat.com>
Subject: Re: nonzero LUN on USB Bulk Only Transfer fails with QEMU+edk2
Date: Tue, 19 Feb 2019 09:49:16 +0100 [thread overview]
Message-ID: <20190219084916.yinhlryf4sgx7t5p@sirius.home.kraxel.org> (raw)
In-Reply-To: <cae4cdd7-2693-275b-5a54-e419e914d0a2@redhat.com>
Hi,
> (2) If I change the cmdline to "lun=5", then the exchange is:
Not supported (by the usb protocol).
The protocol has a control message to query the number of devices (grep
for GetMaxLun in qemu). LUNs are not allowed to be sparse. So, with a
single storage device the LUN must be zero. With two devices the LUNs
must be 0,1, with three 0,1,2 etc., you get the idea :)
Maybe usb-bot should check for that and throw an error, I think right
now we only have the generic scsi code check which will verify the lun
isn't too big (<= 15) but will not check the non-sparse requirement.
cheers,
Gerd
next prev parent reply other threads:[~2019-02-19 8:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-13 8:37 nonzero LUN on USB Bulk Only Transfer fails with QEMU+edk2 Laszlo Ersek
2019-02-13 17:00 ` Philippe Mathieu-Daudé
2019-02-14 0:13 ` Laszlo Ersek
2019-02-19 8:49 ` Gerd Hoffmann [this message]
2019-02-19 8:54 ` Laszlo Ersek
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