Fix IDE DIAGNOSE for packet devices (Vincent Sanders)
The DIAGNOSE command in the qemu IDE implementation has an error when use dfor packet devices. The status register value is dependant on the drive being a packet device or not, this patch corrects the returned status. From the ATA/PI specification (V6 draft): "If the device implements the PACKET command feature set, the device SHALL clear bits 6,5,4,3,2 and 0 in the Status register to zero." A selection of physical devices have been checked and do conform to the specifications behaviour. Signed-off-by: NVincent Sanders <vince@simtec.co.uk> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5452 c046a42c-6fe2-441c-8c8c-71466251a162
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