[U-Boot] [PATCH] arm: vf610: move device tree after kernel image

[Stefan Agner]

On 2015-10-14 01:36, Albert ARIBAUD wrote:
> Hello Stefan,
> 
> On Tue, 13 Oct 2015 23:11:45 -0700, Stefan Agner <stefan at agner.ch>
> wrote:
>> Since the device tree relocation is disabled (fdt_high set to
>> 0xffffffff), U-Boot keeps the device tree at its load address
>> 0x81000000. The kernel uncompresses itself to 0x80008000 by
>> default, hence this limits the maximum (uncompressed) kernel
>> size to somewhat below 16MiB, otherwise the device tree gets
>> overwritten by the kernel data...
>>
>> Move the device tree load address to 0x84000000 to avoid that
>> the device tree being overwritten by the kernel.
> 
> OOC, why is device tree relocation disabled? I'm asking because by
> manually placing the device tree (or anything else) high in DDR, one
> runs the risk of overwriting some of U-Boot's data.

I guess this has been done for Cortex-M4 firmwares running from DDR. As
Tom pointed out, this can be archived in a nicer way using bootm_size.

--
Stefan