reserved memory from devicetree definition

[Sean Anderson]

On 3/4/21 8:04 PM, Bin Meng wrote:
> On Fri, Mar 5, 2021 at 8:26 AM jorge courett <jorge.courett at gmail.com> wrote:
>>
>> Hi!
>> Is there any way to use a reserved memory definition in the device tree to
>> avoid that u-boot could use that SDRAM memory region? Or the only way is by
>> compiler configuration?
> 
> The use case you pointed out is not supported by U-Boot. U-Boot
> currently only supports insert /reserved-memory node on some boards.
> 
> Patches are welcome to support the new use case :)
> 
> Regards,
> Bin

In the general case you can do this if your arch/board's dram_init calls
fdtdec_setup_mem_size_base. Though there are numerous ways to override
these values, so see setup_dest_addr for details. Do note that many
memory addresses are set via several different methods, depending on the
board. So you might need to have some compile-time modification anyway.

--Sean