Re: [ECOS] Can I assign the offset of code start in redboot.binwhen using startup from ROM

["Steven_cheng" <05071 at alphanetworks dot com>]

Hi Gray,

    I configure eCos with configtool.
Step:
    1) Select Template "Cogent PowerPC 8245" and Package "RedBoot"
    2) Configure Startup type "ROM"
    3) Import  packages/hal/powerpc/csb281/current/misc/redboot_ROM.ecm
    4) Build  code
    5) burn install/bin/redboot.bin (and check the content of redboot.bin)

Question:
    1) Does the rom image be burned with redboot.bin
    2) Does the code start from the _start in the vector.S  for startup type
"ROM"  ??

Thank you for your help ~~~

/Steven

After executing the command "powerpc-eabi-objdump -h
install/bin/redboot.elf",
The result is as following table:

file format elf32-powerpc
Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .vectors      00001500  fff00000  fff00000  00010000  2**8
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 .text         0001489c  fff01500  fff01500  00011500  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  2 .fini         00000000  fff15d9c  fff15d9c  00033f48  2**0
                  CONTENTS
  3 .rodata1      00000000  fff15da0  fff15da0  00033f48  2**0
                  CONTENTS
  4 .rodata       00003880  fff15da0  fff15da0  00025da0  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  5 .fixup        00000000  fff19620  fff19620  00033f48  2**0
                  CONTENTS
  6 .gcc_except_table 00000000  fff19620  fff19620  00033f48  2**0
                  CONTENTS
  7 .data         00000c48  00003300  fff19620  00033300  2**3
                  CONTENTS, ALLOC, LOAD, CODE
  8 .sbss         00000100  00003f48  00003f48  00003f48  2**3
                  ALLOC
  9 .bss          00005420  00004050  00004050  00003f50  2**4
                  ALLOC
 10 .debug_line   0000d084  00000000  00000000  00033f48  2**0
                  CONTENTS, READONLY, DEBUGGING
 11 .debug_info   0002ff4e  00000000  00000000  00040fcc  2**0
                  CONTENTS, READONLY, DEBUGGING
 12 .debug_abbrev 00006886  00000000  00000000  00070f1a  2**0
                  CONTENTS, READONLY, DEBUGGING
 13 .debug_aranges 000015f0  00000000  00000000  000777a0  2**3
                  CONTENTS, READONLY, DEBUGGING
 14 .debug_frame  000032c0  00000000  00000000  00078d90  2**2
                  CONTENTS, READONLY, DEBUGGING
 15 .debug_pubnames 00002800  00000000  00000000  0007c050  2**0
                  CONTENTS, READONLY, DEBUGGING
 16 .debug_str    00005d6c  00000000  00000000  0007e850  2**0
                  CONTENTS, READONLY, DEBUGGING
 17 .debug_ranges 00000710  00000000  00000000  000845bc  2**0
                  CONTENTS, READONLY, DEBUGGING

> >
> > Environment:
> >     arch: MPC8245
> >     package: RedBoot
> >     startup type: ROM
> >
> > After building the code, I burn the the redboot.bin into my rom flash,
but
> > it
> > seems not to be executed. Then I found that the code offset starts in
0x0,
> > not
> > in 0x100,  in the redboot.bin.  The MPC8245 can not start from offset
0x100
> > to execute the rom code. So the rom code is failed.
> >
> > Questions:
> >     1) The MPC8245 rom code should start from 0x100 in redboot.bin for
> > burning.(???)
> >     2) Does anybody know how I can move the code offset start from 0x0
to
> > 0x100 ??
> >     3) Does the code start from the _start in the vector.S  for startup
type
> > "ROM" ??
> >
> > It was as following:
> >
> > 0x00000000  rom_code  _start    # map to _start in vectors.S
> > 0x00000010  rom_code
> > 0x00000020  rom_code ......
> > ...
> > 0x00000100  rom_code ......
> > ......
> >
> >
> > But I think it should be as following:
> >
> > 0x00000000  Vector
> > 0x00000010  empty
> > 0x00000020  empty
> > ...
> > 0x00000100  rom_code _start ......# map to _start in vectors.S
> > ......
> >
> > 4) Is it  correct ??
> >
>
> How did you configure eCos?  (i.e. what commands/steps did you use?)
> You can see how the image is laid out in memory using this command:
>   powerpc-eabi-objdump -h install/bin/redboot.elf
> What do you see from it?
>
> -- 
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
> ------------------------------------------------------------
>


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss