+Simon On 06/27/2018 01:05 AM, Prabhakar Kushwaha wrote: > Hi All, > > We are trying to add support of device-tree for PowerPC platforms. As per our > analysis following 2 options can be used. > > a) CONFIG_OF_SEPARATE > b) CONFIG_OF_EMBED > > In PowerPC platforms, reset_vector is always expected at the **last** address > of flash. > U-boot binary has reset_vector at last followed by __bss sections(not present > in binary) and must be programmed in such a way that reset_vecrot lie at > **last** address of flash. > > Hence dtb cannot be appended at last of u-boot binary. > > So there looks to be following 2 possible solutions > a) Use CONFIG_OF_SEPARATE and append dtb at start of u-boot binary. This > require change in flash map because u-boot start address needs to shifted > (due to reset_vector requirements). > Exiting offset of env and fman ucode also needs shifting. This approach > requires modification in almost all existing PowerPC platform to adhere to > new **modified** flash map. > > b) Use CONFIG_OF_EMBED and embed dtb inside u-boot. This way no change in > exiting flash map. But its usage is being discouraged as per > doc/README.fdt-control. >
Clearly putting dtb at the very end doesn't work, neither last 4KB. I think we either use CONFIG_OF_EMBED (many boards use this way), or try "fdtcontroladdr". York _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot