Re: [Qemu-devel] [RFC PATCH] arm boot: added QOM device definition

[Paul Brook <paul@codesourcery.com>]

> So here are some of the problems im trying to solve with the bootloader:
> 
> Smp bootstrap secondary CPUs while loading an elf (currently elfs will be
> assumed to be not kernels).
> Change the kernel, initrd and dtb load address on the command line.
> Use my own SMP secondary bootloop.
> 
> My intention with this patch was to set myself to do boot parameterizations
> on the command line by just adding them as qdev props to the
> arm_linux_loader and set them using -device instantiation. E.G. -device
> arm_boot_loader,initrd_addr=0x10000000. But if I take the approach you are
> suggesting, the for this initrd load address option, I would need to add
> myself a command line option, fetch that command line option in every arm
> machine model and then pass it to arm_load_kernel.

No.  You just set/override properties on the device that the machine created.
I thought we already had this, but it looks like the closest we have is
-global.

Something like "-property /devicepath/propertyname=value".
This is something we need anyway.  Creating new devices with -device is of 
very limited value if you can't link existing device properties to that new 
device.  Remember that in the new world order we don't have magic bus-device, 
everything is done via link properlties.

Paul