Re: [PATCH 00/15] MIPS Malta DT Conversion

[Paul Burton]

On Mon, May 25, 2015 at 02:59:31AM -0500, Rob Landley wrote:
> On Fri, May 22, 2015 at 10:50 AM, Paul Burton <paul.burton@xxxxxxxxxx> wrote:
> > This series begins converting the MIPS Malta board to use device tree,
> > which is done with a few goals in mind:
> >
> >   - To modernise the Malta board support, providing a cleaner example to
> >     people referencing it when bringing up new boards and reducing the
> >     amount of code they need to write.
> >
> >   - To make the code at the board level more generic with the eventual
> >     aim of sharing it between multiple boards & allowing for
> >     multi-platform kernel binaries. Although this series doesn't result
> >     in the kernel reaching those goals, it is a step in that direction.
> >
> >   - To result in a more maintainable kernel through a combination of the
> >     above.
> 
> How would I go about testing this under qemu?
> 
> (Especially the "more than 256 megs ram" part. :)

Hi Rob,

With the series applied you can start from malta_defconfig, enable
CONFIG_HIGHMEM, build your kernel then run QEMU like so:

  $ qemu-system-mipsel -kernel vmlinux -m 1G -append memsize=1G -serial stdio

If you apply this patch to QEMU:

  https://www.mail-archive.com/qemu-devel@xxxxxxxxxx/msg297902.html

(or if you use a real board) then you can omit the memsize argument from
the kernel command line (ie. the -append) and just do:

  $ qemu-system-mipsel -kernel vmlinux -m 1G -serial stdio

The kernel will then retrieve the correct memory size from the
bootloader-provided environment and make use of all the available RAM.

Thanks,
    Paul

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