Hi
I'm adding a new board support to u-boot-2018.09. When I boot the device,I got an error msg:
No valid device tree binary found - please append one to U-Boot binary, use u-boot-dtb.bin or define CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>
After some debugging, I found the reason:
the device tree blob is cat to u-boot-nodtb.bin. the dtb is referenced by `_end` symbol which is defined at arch/mips/cpu/u-boot.lds
/* * .rel must come last so that the mips-relocs tool can shrink * the section size & the PT_LOAD program header filesz. */ .rel : { __rel_start = .; BYTE(0x0) . += (32 * 1024) - 1; }
_end = .;
But mips-relocs tool shrink the .rel section, that make filesz smaller than memsz:
Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align ABIFLAGS 0x02c2a8 0x8102c228 0x8102c228 0x00018 0x00018 R 0x8 LOAD 0x000080 0x81000000 0x81000000 0x30906 0x3638c RWE 0x10
the _end is 0x3638c, but the actual offset of dtb is changed to 0x30906. so we can't read the dtb correctly.
I disable shrink then works fine. but a better solution is to change the _end symbol in u-boot elf accordingly.
Best Regards.