On 09/13/2012 01:47 AM, Sebastian Andrzej Siewior wrote: > On 09/13/2012 12:08 AM, Rob Herring wrote: >>> Geert is right here. If it is a physical address, it should be >>> phys_addr_t. >> >> While generally true, for the DT specific code I think it should be a >> fixed u64. The size of the address is defined by the FDT, not the >> kernel. It is very likely we could have a FDT that specifies addresses >> in 64-bit values, but then we boot a kernel is compiled for !LPAE. >> phys_addr_t is currently sized based on LPAE setting. > > If your kernel is 32bit without PAE and your DTB address is >32ibt than > you can't handle it. If you don't notice this in your dt code than you > remap the wrong memory ioremap(). The size of the initrd fields are set by #address-cells properties and determined when you create the dtb. The address to load the initrd is decided by the bootloader/user and set at that point later in time. The dtb should not be tied to the kernel you are booting. Obviously, if you want to boot a non-PAE kernel, everything has to be placed at <4GB. I can boot i386 and i386-pae kernels on an i386-pae machines. I expect to generally be able to do that on ARM. Perhaps some SOCs like this one will not allow that, it is not always true. Rob
