Re: [Qemu-devel] [PATCH] arm_boot: Change initrd load address to "halfway through RAM"

[Peter Maydell]

On 26 October 2012 15:19, Peter Maydell <address@hidden> wrote:
> +    /* Put the initrd halfway through RAM; this means that on
> +     * most boards we will not be in danger of overlapping the
> +     * initrd with the kernel, but will still work OK on models
> +     * with only small amounts of RAM (which can be assumed to
> +     * have correspondingly small kernels).
> +     */
> +    info->initrd_start = info->loader_start + (info->ram_size / 2);

I've realised this won't quite work for boards with lots of RAM:
for instance a vexpress-a15 with 6GB of RAM would put the initrd
over the 4GB boundary where the kernel can't get at it. Instead:

    info->initrd_start = info->loader_start +
                         MIN(info->ram_size / 2, 128 * 1024 * 1024);

(and adjust comment to match). Anybody with a 128MB kernel should
definitely consider enabling modules :-)

-- PMM