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Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line |
Date: |
Thu, 18 Dec 2008 16:20:01 +0000 |
User-agent: |
KMail/1.9.9 |
On Thursday 18 December 2008, Jan Kiszka wrote:
> When booting a guest from the command line, you normally do not need the
> interactive boot menu with its 3 s waiting that someone might press F12.
> So this patch introduces a mechanism to enable the boot menu only on
> demand, ie. when the user provided the command line switch -bootmenu.
> This reduces boot times to their original dimension.
>
> The host-guest interface used here is CMOS RAM byte 0x60. If it is
> non-zero, the guest BIOS will skip the F12 delay, keeping the previous
> behavior in case the host does not support it. -bootmenu was chosen in
> favor of -boot as the syntax of the latter is not easily and cleanly
> extensible.
I'm not sure I believe this. We already support multiple options to -boot so
why not just add another one (e.g. "q") that means include the boot menu?
i.e. -boot qcad would give the current behaviour.
I've no particular preference whether this is communicated to the bios via the
current 0x3d region or via a new byte. It looks like there's a spare bit in
byte 0x38 that could be used.
Paul
- [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line, Jan Kiszka, 2008/12/18
- Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line, Gleb Natapov, 2008/12/18
- Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line,
Paul Brook <=
- Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line, Anthony Liguori, 2008/12/18
- Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line, Jan Kiszka, 2008/12/18
- Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line, Anthony Liguori, 2008/12/18
- Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line, Gleb Natapov, 2008/12/18
- Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line, Laurent Vivier, 2008/12/18
- [Qemu-devel] Re: [PATCH] x86: Manage BIOS boot menu via command line, Jan Kiszka, 2008/12/18
Re: [Qemu-devel] [PATCH] x86: Manage BIOS boot menu via command line, Anthony Liguori, 2008/12/18