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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