diff options
Diffstat (limited to 'docs/bootindex.txt')
| -rw-r--r-- | docs/bootindex.txt | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/docs/bootindex.txt b/docs/bootindex.txt index 803ebfc..f84fac7 100644 --- a/docs/bootindex.txt +++ b/docs/bootindex.txt @@ -9,7 +9,7 @@ still be bootable. == Example == -Lets assume we have QEMU machine with two NICs (virtio, e1000) and two +Let's assume we have a QEMU machine with two NICs (virtio, e1000) and two disks (IDE, virtio): qemu -drive file=disk1.img,if=none,id=disk1 @@ -20,7 +20,7 @@ qemu -drive file=disk1.img,if=none,id=disk1 -netdev type=user,id=net1 -device e1000,netdev=net1,bootindex=1 Given the command above, firmware should try to boot from the e1000 NIC -first. If this fails, it should try the virtio NIC next, if this fails +first. If this fails, it should try the virtio NIC next; if this fails too, it should try the virtio disk, and then the IDE disk. == Limitations == @@ -28,7 +28,7 @@ too, it should try the virtio disk, and then the IDE disk. 1. Some firmware has limitations on which devices can be considered for booting. For instance, the PC BIOS boot specification allows only one disk to be bootable. If boot from disk fails for some reason, the BIOS -won't retry booting from other disk. It still can try to boot from +won't retry booting from other disk. It can still try to boot from floppy or net, though. 2. Sometimes, firmware cannot map the device path QEMU wants firmware to @@ -36,8 +36,8 @@ boot from to a boot method. It doesn't happen for devices the firmware can natively boot from, but if firmware relies on an option ROM for booting, and the same option ROM is used for booting from more then one device, the firmware may not be able to ask the option ROM to boot from -a particular device reliably. For instance with PC BIOS, if a SCSI HBA +a particular device reliably. For instance with the PC BIOS, if a SCSI HBA has three bootable devices target1, target3, target5 connected to it, the option ROM will have a boot method for each of them, but it is not possible to map from boot method back to a specific target. This is a -shortcoming of PC BIOS boot specification. +shortcoming of the PC BIOS boot specification. |