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[Qemu-devel] [PATCH] docs: Add a note about mixing bootindex with "-boot
From: |
Thomas Huth |
Subject: |
[Qemu-devel] [PATCH] docs: Add a note about mixing bootindex with "-boot order" |
Date: |
Tue, 28 Feb 2017 18:40:01 +0100 |
Occasionally the users try to mix the bootindex properties with the
"-boot order" parameter - and this likely does not give the expected
results. So let's add a proper statement that these two concepts
should not be used together.
Signed-off-by: Thomas Huth <address@hidden>
---
docs/bootindex.txt | 9 +++++++++
qemu-options.hx | 5 ++++-
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/docs/bootindex.txt b/docs/bootindex.txt
index f84fac7..9e0ac07 100644
--- a/docs/bootindex.txt
+++ b/docs/bootindex.txt
@@ -41,3 +41,12 @@ 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 the PC BIOS boot specification.
+
+== Mixing bootindex and boot order parameters ==
+
+Note that it does not make sense to use the bootindex property together
+with the "-boot order=..." (or "-boot once=...") parameter. The guest
+firmware implementations normally either support the one or the other,
+but not both parameters at the same time. Mixing them will result in
+undefined behavior, and thus the guest firmware will likely not boot
+from the expected devices.
diff --git a/qemu-options.hx b/qemu-options.hx
index bf458f8..aa11420 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -234,7 +234,10 @@ drive letters depend on the target architecture. The x86
PC uses: a, b
(floppy 1 and 2), c (first hard disk), d (first CD-ROM), n-p (Etherboot
from network adapter 1-4), hard disk boot is the default. To apply a
particular boot order only on the first startup, specify it via
address@hidden
address@hidden Note that the @option{order} or @option{once} parameter
+should not be used together with the @option{bootindex} property of
+devices, since the firmware implementations normally do not support both
+at the same time.
Interactive boot menus/prompts can be enabled via @option{menu=on} as far
as firmware/BIOS supports them. The default is non-interactive boot.
--
1.8.3.1
- [Qemu-devel] [PATCH] docs: Add a note about mixing bootindex with "-boot order",
Thomas Huth <=