[U-Boot] u-boot FIT image support

[York Sun <yorksun@freescale.com>]

On 08/10/2015 11:40 AM, Simon Glass wrote:
> Hi York,
> 
> On 7 August 2015 at 17:12, York Sun <yorksun@freescale.com> wrote:
>>
>>
>> On 08/07/2015 03:47 PM, Simon Glass wrote:
>>> Hi York,
>>>
>>> On 7 August 2015 at 14:48, York Sun <yorksun@freescale.com> wrote:
>>>>
>>>> Simon,
>>>>
>>>> I was doing an experiment to put the load address and entry address of Linux to
>>>> higher than 32-bit address. I found it is broken to process more than 32-bit
>>>> addresses. When I attempted to fix it, I was troubled by those code used for
>>>> both host and target, like common/image-fit.c. For example, to process 64-bit
>>>> address, the function
>>>>
>>>> int fit_image_get_load(const void *fit, int noffset, ulong *load)
>>>>
>>>> should be converted to
>>>>
>>>> int fit_image_get_load(const void *fit, int noffset, uint64_t *load)
>>>>
>>>> ulong is 64-bit for 64-bit target such as ARMv8, but it can be 32-bit on host.
>>>> If I use uint64_t, all related code in bootm and others need to change. Before I
>>>> go too far, I'd like to check if anyone has tried to enable this in FIT image.
>>>>
>>>> #address-cells = <2>;
>>>>
>>>> I can try to use uint64_t in place of ulong for all related code if that's
>>>> right. That will be a lot of change.
>>>
>>> Perhaps I misunderstand something, but I think ulong should be OK on
>>> the host. I just needs to hold a machine address. On a 32-bit host
>>> this cannot be 64-bit. Can you explain the problem a bit more?
>>>
>>> I have not need #address-cells in a FIT.
>>>
>>> It would be better to use ulong for addresses in U-Boot I think. It is
>>> safe and efficient on both 32- and 64-bit machines.
>>>
>>
>> Simon,
>>
>> Considering this situation, building FIT image on an ubuntu 12.04 32-bit host,
>> for ARMv8 target. I believe ulong is OK on 64-bit target. But it is not for the
>> host mkimage. To proper deal with address cell = 2, the function
>> fit_image_get_load() and fit_image_get_entry() need to make 64-bit address from
>> FIT image. mkimage runs on 32-bit host doesn't take ulong as 64-bit, does it? So
>> I can generate a FIT image with the address cell and load/entry address I need,
>> but I cannot display it correctly with mkimage. I think I can use the image on
>> 64-bit target after fixing some parsing code as I mentioned.
>>
>> The background for this experiment is I am trying to shift DDR to a continuous
>> space. For ARMv8, DDR can have three regions, with only 2GB under 32-bit address
>> space.
> 
> We really don't want to end up with everything being 64-bit just
> because the tools need to work correctly. I wonder if phys_addr_t
> might help here? We could define that to be 64-bit for the host,
> perhaps?

I see. Let me try more.

York