Re: [Qemu-devel] [PATCH 3/6] hw/arm_boot.c: Check for RAM sizes exceeding ATAGS capacity

[Peter Maydell <peter.maydell@linaro.org>]

On 6 July 2012 03:05, Peter Crosthwaite <peter.crosthwaite@petalogix.com> wrote:
> On Fri, Jul 6, 2012 at 3:00 AM, Peter Maydell <peter.maydell@linaro.org> wrote:
>> +            if (info->ram_size >= (1ULL << 32)) {
>> +                fprintf(stderr, "qemu: RAM size must be less than 4GB to boot"
>> +                        " Linux kernel without device tree\n");
>
> Error message is a bit weird. Shouldnt it be "RAM size must be less
> than 4GB to boot Linux kernel with ATAG command line". DTB shouldnt be
> the only way to boot with >4GB.

I'm trying to steer the user toward the way to solve their problem,
which is to use a device tree. I expect less than 1 QEMU user in 100
has any idea what ATAGS are.

> DTB shouldnt be the only way to boot with >4GB.

I'm not sure what you mean here -- we have two boot methods and
only DTB handles large RAM sizes. Or do you mean machines with eg
flash where you could boot by putting a bootloader in flash?

-- PMM