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[Qemu-devel] [Bug 1429841] Re: error "rom: requested regions overlap" fo

From: Roman
Subject: [Qemu-devel] [Bug 1429841] Re: error "rom: requested regions overlap" for NOLOAD sections
Date: Wed, 11 Mar 2015 14:19:53 -0000

additional info:
0MFWSL_EmoDatauP1_CUNIT.elf from previous post runs fine with 1.0.50 (Debian 
1.0.50-2012.03-0ubuntu2.1) and 0.10.2

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  error "rom: requested regions overlap" for NOLOAD sections

Status in QEMU:

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

  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:
  Idx Name          Size      VMA       LMA       File off  Algn
   35 .marker_appli 00001000  801ae000  801ae000  00025000  2**0
   36 .safe_data    00000014  80200000  8001b000  00020000  2**2
                    CONTENTS, ALLOC, LOAD, DATA
   37 .safe_bss     00000488  80200020  8001b020  00020014  2**2
   38 .marker_safe_data 00001000  80201000  8001c000  00029000  2**0
   39 .data         000008cc  80202000  8001b600  00022000  2**3
                    CONTENTS, ALLOC, LOAD, DATA
   40 .bss          0000312c  802028d0  8001bed0  000228cc  2**3
   41 .marker_data  00001000  80206000  8001f600  00026000  2**0
   42 .cunit        00010000  80300000  80119600  00028000  2**0
   43 .marker_code  00001000  8001c000  8001c000  00024000  2**0

  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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