Hi, On Fri, Mar 17, 2023 at 12:34:14AM -0500, Frank Rowand wrote: > When enabling CONFIG_OF on a platform where of_root is not populated by > firmware, we end up without a root node. In order to apply overlays and > create subnodes of the root node, we need one. Create this root node > by unflattening an empty builtin dtb. > > If firmware provides a flattened device tree (FDT) then the FDT is > unflattened via setup_arch(). Otherwise setup_of(), which is called > immediately after setup_arch(), will create the default root node > if it does not exist. > > Signed-off-by: Frank Rowand <frowand.list@xxxxxxxxx> This patch results in a crash on nios2. Building nios2:10m50-ghrd:10m50_defconfig:10m50_devboard.dts ... running ...R failed (crashed) ------------ qemu log: earlycon: uart8250 at MMIO32 0x18001600 (options '') printk: legacy bootconsole [uart8250] enabled Linux version 6.8.0-11409-gf6cef5f8c37f (groeck@desktop) (nios2-linux-gcc (GCC) 11.4.0, GNU ld (GNU Binutils) 2.40) #1 Sun Mar 17 23:38:59 PDT 2024 Kernel panic - not syncing: early_init_dt_alloc_memory_arch: Failed to allocate 72 bytes align=0x40 ---[ end Kernel panic - not syncing: early_init_dt_alloc_memory_arch: Failed to allocate 72 bytes align=0x40 ]--- Reverting this patch fixes the problem. Guenter
