[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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 10:33:17 +1000 |
On Mon, Jan 30, 2012 at 10:28 AM, John Williams
<address@hidden> wrote:
> 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
And while we're at it how about overriding arbitrary boot PC addresses as well?
--boot-addr 0xdeadbeef
It should be possible to boot random bootrom code in QEMU without
hacking on the machine model.
qemu-system-arm -M foo --file address@hidden --boot-addr 0x00001000
We bumped into this recently - we need a cleaner way of telling QEMU
if it's pretending to be just the machine with some minimal initial
state as above(for running bootloaders, baremetal etc), or it's being
the machine *plus* a bootloader (booting vmlinux/zimage).
Currently it's pretty hacky.
John
>
> -- 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
--
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
- [Qemu-devel] [RFC PATCH 5/7] vl.c: added -kerndtb option, (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, 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, 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
Message not available