On 04/25/15 02:10, Michael van Elst wrote:
There is no safe way to identify the boot disk from information passed by the BIOS. Here is what the MD code for x86 does: 1. BTINFO_ROOTDEVICE
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Well on our Dell system this assumption is invalid. When booting from a virtual CD image this is emulated as a USB cdrom. SATA cdroms attached to the system will be found/attached first. USB cdroms later in the boot sequence. The 'first device' heuristic leads to surprising behavior in the case. In order not to silently switch the boot device you need to completely disable the SATA controller in the BIOS. So maybe this logic should be revisited.3. BTINFO_BOOTDISK a) ... b) ... c) bootloader passed BIOS disk number for a CD Search for the first "cd" device, you can only boot from unit 0. Pass driver instance (and partition 0) to MI code.
Frank