Re: [U-Boot] mips-relocs tool conflicts with CONFIG_OF_SEPRATE

17 Nov 2018

      Am Sa., 17. Nov. 2018, 15:43 hat 袁建鹏 yuanjp@hust.edu.cn geschrieben:
...
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>
This is fixed in v2018.11, please rebase.
...
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.
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Re: [U-Boot] mips-relocs tool conflicts with CONFIG_OF_SEPRATE

Daniel Schwierzeck