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Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option
From: |
John Williams |
Subject: |
Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option |
Date: |
Mon, 30 Jan 2012 10:28:53 +1000 |
On Sun, Jan 29, 2012 at 4:51 PM, Peter Crosthwaite
<address@hidden> wrote:
> Hi All,
>
> So on the topic of these command line arguments for initrd, dtb and friends,
> another related issue we have encountered (and have hacked around in our
> tree) is not being able to relocate the initrd or kernel. Currently these
> memory locations are hardcoded in arm_boot.c:
>
> #define KERNEL_ARGS_ADDR 0x100
> #define KERNEL_LOAD_ADDR 0x00010000
> #define INITRD_LOAD_ADDR 0x00d00000
>
> If you see patch 6/7 in this same series I put in place a hack to override
> the initrd location in memory, but I wonder if instead this should go up to
> the command line interface as a parameter. Currently the machine model (or
> arm_boot.c) defines exactly where kernels/initrds/command-line-args line in
> memory, but since these are software properties should perhaps they go up to
> the command line as -kernel,foo=bar options? E.G:
>
> qemu-system-arm
> -kernel,kernel-image=/foo/zImage,kernel-addr=0x00010000,initrd=/foo/initrd,initrd_addr=0x00d00000
There's an opportunity here - QEMU needs the cmdline ability to load
random binaries/elfs anyway, such as
--load address@hidden
e.g. --load address@hidden
-- load file.elf
(no address required)
This option or one like it would make it much easier and less
hard-coded to assemble any sort of initial memory state.
Extending this, kernels, initrds and DTBs all can have
machine-specific preferred addresses but can be overriden in the same
way:
--kernel address@hidden --initrd address@hidden
and so on
The '@' symbol will need to be escaped by it's a pretty natural syntax.
John
--
John Williams, PhD, B. Eng, B. IT
PetaLogix - Linux Solutions for a Reconfigurable World
w: www.petalogix.com p: +61-7-30090663 f: +61-7-30090663
- Re: [Qemu-devel] [RFC PATCH 4/7] cadence_gem: first revision, (continued)
- Message not available
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Stefan Weil, 2012/01/24
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Scott Wood, 2012/01/26
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Eric Blake, 2012/01/26
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Markus Armbruster, 2012/01/27
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Peter Crosthwaite, 2012/01/29
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option,
John Williams <=
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, John Williams, 2012/01/29
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Anthony Liguori, 2012/01/29
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, John Williams, 2012/01/29
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Anthony Liguori, 2012/01/29
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, John Williams, 2012/01/29
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Anthony Liguori, 2012/01/29
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, John Williams, 2012/01/31
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Anthony Liguori, 2012/01/29
- Re: [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, Peter Maydell, 2012/01/26
Message not available