[Qemu-devel] [Bug 1429841] Re: error "rom: requested regions overlap" for NOLOAD sections

[Roman]

To make things more easy I added some debug output to function rom_load_all().
It prints infos for every rom section is processes:

rom phdr #1: 0MFWSL_EmoDatauP1_CUNIT.elf. free=0x0000000000000000, 
size=0x000000000000003c, addr=0x0000000000000000)
rom phdr #2: 0MFWSL_EmoDatauP1_CUNIT.elf. free=0x00000000000008a0, 
size=0x00000000000161c4, addr=0x000000000000003c)
rom phdr #3: 0MFWSL_EmoDatauP1_CUNIT.elf. free=0x0000000000016a64, 
size=0x000000000000107c, addr=0x0000000000016a64)
rom phdr #4: 0MFWSL_EmoDatauP1_CUNIT.elf. free=0x0000000000016aac, 
size=0x0000000000001b3c, addr=0x0000000000017ae0)
rom: requested regions overlap (rom phdr #4: 0MFWSL_EmoDatauP1_CUNIT.elf. 
free=0x0000000000017ae0, addr=0x0000000000016aac, size=0x0000000000001b3c)
rom phdr #5: 0MFWSL_EmoDatauP1_CUNIT.elf. free=0x0000000000017e64, 
size=0x0000000000000400, addr=0x00000000000185e8)
rom: requested regions overlap (rom phdr #5: 0MFWSL_EmoDatauP1_CUNIT.elf. 
free=0x00000000000185e8, addr=0x0000000000017e64, size=0x0000000000000400)
rom phdr #6: 0MFWSL_EmoDatauP1_CUNIT.elf. free=0x00000000001152ac, 
size=0x0000000000000400, addr=0x0000000000018264)
rom phdr #7: 0MFWSL_EmoDatauP1_CUNIT.elf. free=0x00000000001a7000, 
size=0x0000000000000400, addr=0x00000000001156ac)

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https://bugs.launchpad.net/bugs/1429841

Title:
  error "rom: requested regions overlap" for NOLOAD sections

Status in QEMU:
  New

Bug description:
  command line:
  qemu-system-arm -semihosting -nographic -monitor null -serial null -no-reboot 
-kernel build/fw/0HNFcomSLuP1_CUNIT.elf

  output:
  rom: requested regions overlap (rom phdr #6: build/fw/0HNFcomSLuP1_CUNIT.elf. 
free=0x8001effc, addr=0x8001c000)
  rom loading failed

  I checked the sections of the .elf file with arm-none-eabi-objdump -h:
  Sections:
  Idx Name          Size      VMA       LMA       File off  Algn
  ...
   35 .marker_appli 00001000  801ae000  801ae000  00025000  2**0
                    ALLOC
   36 .safe_data    00000014  80200000  8001b000  00020000  2**2
                    CONTENTS, ALLOC, LOAD, DATA
   37 .safe_bss     00000488  80200020  8001b020  00020014  2**2
                    ALLOC
   38 .marker_safe_data 00001000  80201000  8001c000  00029000  2**0
                    ALLOC
   39 .data         000008cc  80202000  8001b600  00022000  2**3
                    CONTENTS, ALLOC, LOAD, DATA
   40 .bss          0000312c  802028d0  8001bed0  000228cc  2**3
                    ALLOC
   41 .marker_data  00001000  80206000  8001f600  00026000  2**0
                    ALLOC
   42 .cunit        00010000  80300000  80119600  00028000  2**0
                    ALLOC
   43 .marker_code  00001000  8001c000  8001c000  00024000  2**0
                    ALLOC
  ...

  So I had a look where the values in  the error message could come from:
  0x8001c000: is the "LMA" value of section .marker_safe_data
  0x8001effc: is "Size" + "LMA" of the .bss section (0x0000312c + 0x8001bed0)

  So it is correct that (regarding the "LMA" value) the .marker_safe_data 
section collides with .bss section.
  But actually these sections have no "LOAD" attribute, so I would guess that 
their "LMA" should not be used anyway.
  Those section should reside at their "VMA" addresses (0x802xxxxx) during 
runtime but they have no data to load.

  Or am I getting something completely wrong?
  Should I give an additional option to qemu?

  I got this error with 2.0.0+dfsg-2ubuntu1.10 and 1.0.50-2012.03-0ubuntu2.1
  I didn't get this error (but others) with 0.10.2

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