[U-Boot-Users] uImage's load address and entry point?

[U-Boot-Users] uImage's load address and entry point?

[Shawn]

Hi,

I have built a uClinux kernel image vmlinux and the header information
is dumped here by objdump. I want to make a uImage to let u-boot start
linux and am confused about the values of load address and entry
point. If the uImage is built from raw binary linux.bin, the load
address and entry point should be set to 0. Right? If it is built from
vmlinux, the entry point in my case should be 0x00008000, what' should
be the load address?

Thanks,
-Shawn.

vmlinux:     file format elf32-littlearm

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .init         00011000  00008000  00008000  00008000  2**5
                  CONTENTS, ALLOC, LOAD, CODE
  1 .text         0014e7c0  00019000  00019000  00019000  2**5
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  2 __ex_table    000009b8  001677c0  001677c0  001677c0  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  3 __ksymtab     00000000  00168178  00168178  0017f720  2**0
                  CONTENTS
  4 __ksymtab_gpl 00000000  00168178  00168178  0017f720  2**0
                  CONTENTS
  5 __kcrctab     00000000  00168178  00168178  0017f720  2**0
                  CONTENTS
  6 __kcrctab_gpl 00000000  00168178  00168178  0017f720  2**0
                  CONTENTS
  7 .data         0001570c  0016a000  0016a000  0016a000  2**5
                  CONTENTS, ALLOC, LOAD, DATA
  8 .bss          000117d4  0017f720  0017f720  0017f720  2**5
                  ALLOC
  9 .debug_abbrev 00051055  00000000  00000000  0017f720  2**0
                  CONTENTS, READONLY, DEBUGGING
 10 .debug_info   01ab2fc5  00000000  00000000  001d0775  2**0
                  CONTENTS, READONLY, DEBUGGING
 11 .debug_line   00243022  00000000  00000000  01c8373a  2**0
                  CONTENTS, READONLY, DEBUGGING
 12 .debug_pubnames 00011e0c  00000000  00000000  01ec675c  2**0
                  CONTENTS, READONLY, DEBUGGING
 13 .debug_aranges 000035b0  00000000  00000000  01ed8568  2**0
                  CONTENTS, READONLY, DEBUGGING

[U-Boot-Users] uImage's load address and entry point?

[Wolfgang Denk]

In message <c3d0340b041112155334118395@mail.gmail.com> you wrote:
> 
> I have built a uClinux kernel image vmlinux and the header information
> is dumped here by objdump. I want to make a uImage to let u-boot start
> linux and am confused about the values of load address and entry
> point. If the uImage is built from raw binary linux.bin, the load
> address and entry point should be set to 0. Right? If it is built from

Maybe, maybe not. I have no idea what your memory map looks like.

> vmlinux, the entry point in my case should be 0x00008000, what' should
> be the load address?

load address and entry point address do NOT depend on which image you
use for building the U-Boot image (actually the only choice you  have
is  using the raw binary or the compressed raw binary). They depen on
your kernel's memory map, and nothing else.

Best regards,

Wolfgang Denk

-- 
See us @ Embedded/Electronica Munich, Nov 09 - 12, Hall A.6 Booth 513
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Nobody trips over mountains. It is the small pebble that  causes  you
to  stumble.  Pass all the pebbles in your path and you will find you
have crossed the mountain.

[U-Boot-Users] uImage's load address and entry point?

[Shawn]

> > vmlinux, the entry point in my case should be 0x00008000, what' should
> > be the load address?
> 
> load address and entry point address do NOT depend on which image you
> use for building the U-Boot image (actually the only choice you  have
> is  using the raw binary or the compressed raw binary). They depen on
> your kernel's memory map, and nothing else.

I noticed that the load address and entry point are all set to
${ZRELADDR} in both arch/armnommu/boot/Makefile and
arch/arm/boot/Makefile. In my case (CM946E and Integrator CP) the
memory map is as follows.

0x00000000    ---    Flash (alias)
0x00100000    ---    SDRAM (128M)
0x10000000    ---    CM control registers
0x24000000    ---    Flash (16M)

At reset the top 256K (0x24FC0000 - 0x24FFFFFF) of flash is mapped to
address 0x0.

So ${ZRELADDR} should be set to 0x00180000, right? Thus the load
address and entry point are both set to 0x00180000. Right?

Thanks,
-Shawn.

[U-Boot-Users] uImage's load address and entry point?

[Shawn]

> > load address and entry point address do NOT depend on which image you
> > use for building the U-Boot image (actually the only choice you  have
> > is  using the raw binary or the compressed raw binary). They depen on
> > your kernel's memory map, and nothing else.
> 
> I noticed that the load address and entry point are all set to
> ${ZRELADDR} in both arch/armnommu/boot/Makefile and
> arch/arm/boot/Makefile. In my case (CM946E and Integrator CP) the
> memory map is as follows.
> 
> 0x00000000    ---    Flash (alias)
> 0x00100000    ---    SDRAM (128M)
> 0x10000000    ---    CM control registers
> 0x24000000    ---    Flash (16M)
> 
> At reset the top 256K (0x24FC0000 - 0x24FFFFFF) of flash is mapped to
> address 0x0.
> 
> So ${ZRELADDR} should be set to 0x00180000, right? Thus the load
> address and entry point are both set to 0x00180000. Right?

Sorry for some typo. I mean {ZRELADDR} should be set to 0x00108000.
{ZRELADDR} always ends with 0x8000 for ARM.

-Shawn.