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.