[U-Boot] [PATCH] ARM: mx6: Remove the FDT loading address to avoid overlaping

[Tom Rini]

On Tue, Nov 26, 2013 at 09:06:27AM -0200, Otavio Salvador wrote:

> This patch fixes allow for the DeviceTree and initrd relocation fixing
> the boot of FSL 3.10.9-1.0.0-alpha kernel.
> 
> This changes following boards:
> 
>  - mx6sabreauto
>  - mx6sabresd
>  - wandboard
>  - udoo
>  - nitrogen6x
>  - cgtqmx6eval
> 
> The reasoning, as explained by Hui Liu, is:
> 
> ,----
> | The FDT blob will be placed at DDR physical addr: 0x11000000. When Linux kernel
> | Boot up, it will decompress the compressed kernel image and place the decompressed
> | kernel image at the low end of the DDR memory and start running from it. If the
> | decompressed kernel image is bigger for example than 16M, it may over written the
> | fdt blob which u-boot loaded to the DDR memory @0x11000000 with fdt_addr=0x11000000
> |
> | To expand the fdt_addr from 0x11000000 to 0x18000000, which can avoid the override
> | Since we will not likely have one kernel image larger than 128MB.
> `----
> 
> Removing the fdt_high and initrd_high this allows for those to be
> relocated.

I'm going to suggest this is the wrong path.  Once you see i.MX systems
with > 768MB DDR you're going to have initrd/fdt placed into memory
Linux can't access without HIGHMEM on, and you need the FDT before then.

-- 
Tom
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