confusion about relocation (ARM)

confusion about relocation (ARM)

[Matthias Kaehlcke]

hi,

i'm trying to run barebox on an EP93xx (ARM) board, but don't get
beyond the invocation of some initcalls from start_barebox(). at the
moment i have no JTAG for debugging and rely on LEDs for hints whats
going on. my suspicion is that the stack or SDRAM isn't set up
correctly.

a comment in start_barebox() says 'We are running from RAM now', so i
deduced SDRAM must work. but after having a look at start-arm.S i'm a
little bit confused. as far as i understand the barebox code is copied
to RAM in copy_loop(). what i don't see is where the program counter
is set to the address in RAM?

any insights?

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

    Me lo contaron y lo olvidé, lo vi y lo entendí, lo hice y lo aprendí
                              (Confucio)
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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Re: confusion about relocation (ARM)

[Eric Bénard]

Hi Matthias,

Le 01/01/2010 20:48, Matthias Kaehlcke a écrit :
> a comment in start_barebox() says 'We are running from RAM now', so i
> deduced SDRAM must work. but after having a look at start-arm.S i'm a
> little bit confused. as far as i understand the barebox code is copied
> to RAM in copy_loop(). what i don't see is where the program counter
> is set to the address in RAM?
>
in arch/arm/cpu/start-arm.S @ line 245 :
         ldr     pc, _start_armboot

Eric

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Re: confusion about relocation (ARM)

[Matthias Kaehlcke]

hi eric,

thanks for your reply

El Fri, Jan 01, 2010 at 09:36:29PM +0100 Eric Bénard ha dit:

> Le 01/01/2010 20:48, Matthias Kaehlcke a écrit :
>> a comment in start_barebox() says 'We are running from RAM now', so i
>> deduced SDRAM must work. but after having a look at start-arm.S i'm a
>> little bit confused. as far as i understand the barebox code is copied
>> to RAM in copy_loop(). what i don't see is where the program counter
>> is set to the address in RAM?
>>
> in arch/arm/cpu/start-arm.S @ line 245 :
>         ldr     pc, _start_armboot

i saw this line, but i don't understand how it comes that
the address at _start_armboot points to RAM and not to the flash.

another question: how does ARCH_TEXT_BASE fit in here? i defined it as
0x05700000, but in the barebox image _TEXT_BASE is 0x00000000

kind regards

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

             You must have a plan. If you don't have a plan,
               you'll become part of somebody else's plan
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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Re: confusion about relocation (ARM)

[Sascha Hauer]

On Fri, Jan 01, 2010 at 10:48:26PM +0100, Matthias Kaehlcke wrote:
> hi eric,
> 
> thanks for your reply
> 
> El Fri, Jan 01, 2010 at 09:36:29PM +0100 Eric Bénard ha dit:
> 
> > Le 01/01/2010 20:48, Matthias Kaehlcke a écrit :
> >> a comment in start_barebox() says 'We are running from RAM now', so i
> >> deduced SDRAM must work. but after having a look at start-arm.S i'm a
> >> little bit confused. as far as i understand the barebox code is copied
> >> to RAM in copy_loop(). what i don't see is where the program counter
> >> is set to the address in RAM?
> >>
> > in arch/arm/cpu/start-arm.S @ line 245 :
> >         ldr     pc, _start_armboot
> 
> i saw this line, but i don't understand how it comes that
> the address at _start_armboot points to RAM and not to the flash.

When your barebox image is linked to RAM (that is 0x05700000 in your
case) _start_armboot is in RAM, too.

> 
> another question: how does ARCH_TEXT_BASE fit in here? i defined it as
> 0x05700000, but in the barebox image _TEXT_BASE is 0x00000000

Have a look at barebox.S, it should look like:

barebox:     file format elf32-littlearm


Disassembly of section .text:

87f00000 <_start>:
87f00000:	ea000014 	b	87f00058 <reset>
87f00004:	e59ff014 	ldr	pc, [pc, #20]	; 87f00020<_end+0xfffe07c4>
87f00008:	e59ff014 	ldr	pc, [pc, #20]	; 87f00024<_end+0xfffe07c8>
87f0000c:	e59ff014 	ldr	pc, [pc, #20]	; 87f00028<_end+0xfffe07cc>
87f00010:	e59ff014 	ldr	pc, [pc, #20]	; 87f0002c<_end+0xfffe07d0>
87f00014:	e59ff014 	ldr	pc, [pc, #20]	; 87f00030<_end+0xfffe07d4>
87f00018:	e59ff014 	ldr	pc, [pc, #20]	; 87f00034<_end+0xfffe07d8>
87f0001c:	e59ff014 	ldr	pc, [pc, #20]	; 87f00038<_end+0xfffe07dc>

87f00020 <_undefined_instruction>:
87f00020:	87f14a20 	.word	0x87f14a20

87f00024 <_software_interrupt>:
87f00024:	87f14a80 	.word	0x87f14a80

87f00028 <_prefetch_abort>:
87f00028:	87f14ae0 	.word	0x87f14ae0

87f0002c <_data_abort>:
87f0002c:	87f14b40 	.word	0x87f14b40

87f00030 <_not_used>:
87f00030:	87f14ba0 	.word	0x87f14ba0

87f00034 <_irq>:
87f00034:	87f14c00 	.word	0x87f14c00

87f00038 <_fiq>:
87f00038:	87f14c60 	.word	0x87f14c60
87f0003c:	deadbeef 	.word	0xdeadbeef

87f00040 <_barebox_start>:
87f00040:	87f00000 	.word	0x87f00000

87f00044 <_bss_start>:
87f00044:	87f1a908 	.word	0x87f1a908

87f00048 <_bss_end>:
87f00048:	87f1f85c 	.word	0x87f1f85c

87f0004c <_TEXT_BASE>:
87f0004c:	87f00000 	.word	0x87f00000

87f00050 <_MALLOC_BASE>:
87f00050:	87b00000 	.word	0x87b00000

(With 87fxxxx replaced with 0570xxxx of course)

Since EP93xx is not in mainline maybe you can provide us your patches
and I think we should be able to help you.

Regards
  Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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Re: confusion about relocation (ARM)

[Matthias Kaehlcke]

hi sascha,

El Mon, Jan 04, 2010 at 01:07:58PM +0100 Sascha Hauer ha dit:

> On Fri, Jan 01, 2010 at 10:48:26PM +0100, Matthias Kaehlcke wrote:
> > El Fri, Jan 01, 2010 at 09:36:29PM +0100 Eric Bénard ha dit:
> > 
> > > Le 01/01/2010 20:48, Matthias Kaehlcke a écrit :
> > >> a comment in start_barebox() says 'We are running from RAM now', so i
> > >> deduced SDRAM must work. but after having a look at start-arm.S i'm a
> > >> little bit confused. as far as i understand the barebox code is copied
> > >> to RAM in copy_loop(). what i don't see is where the program counter
> > >> is set to the address in RAM?
> > >>
> > > in arch/arm/cpu/start-arm.S @ line 245 :
> > >         ldr     pc, _start_armboot
> > 
> > i saw this line, but i don't understand how it comes that
> > the address at _start_armboot points to RAM and not to the flash.
> 
> When your barebox image is linked to RAM (that is 0x05700000 in your
> case) _start_armboot is in RAM, too.
> 
> > 
> > another question: how does ARCH_TEXT_BASE fit in here? i defined it as
> > 0x05700000, but in the barebox image _TEXT_BASE is 0x00000000
> 
> Have a look at barebox.S, it should look like:
> 
> barebox:     file format elf32-littlearm
> 
> 
> Disassembly of section .text:
> 
> 87f00000 <_start>:
> ...

thanks for your reply!

finally i figured out what was going wrong: after getting compiler errors
when using a config file created from scratch, i took a defconfig of
another ARM board as starting point. this board defines
CONFIG_TEXT_BASE as 0x00000000, in consequence ARCH_TEXT_BASE
(0x05700000) of the edb93xx board wasn't used.

after setting CONFIG_TEST_BASE to the correct value i got a barebox
prompt :)

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

      Debugging is like alien abduction. Large blocks of time disappear,
                    for which you have no explanation
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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Re: confusion about relocation (ARM)

[Robert Schwebel]

On Mon, Jan 04, 2010 at 08:21:53PM +0100, Matthias Kaehlcke wrote:
> after getting compiler errors when using a config file created from
> scratch,

Can you reproduce that and send us the offending config file? Looks like
a bug somewhere.

rsc
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
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Re: confusion about relocation (ARM)

[Matthias Kaehlcke]

El Mon, Jan 04, 2010 at 09:13:11PM +0100 Robert Schwebel ha dit:

> On Mon, Jan 04, 2010 at 08:21:53PM +0100, Matthias Kaehlcke wrote:
> > after getting compiler errors when using a config file created from
> > scratch,
> 
> Can you reproduce that and send us the offending config file? Looks like
> a bug somewhere.

the first problem i faced was the Makefile complaining about an empty
default environment path, though CONFIG_DEFAULT_ENVIRONMENT is not defined:

# CONFIG_DEFAULT_ENVIRONMENT is not set

matze@darwin:/tmp/barebox-2009.12.0$ make
Makefile:1274: *** default environment path empty.  Stop.

this one was easy to work around by commenting the offending section
in the Makefile

reproducing it is as easy as "make ARCH=sandbox menuconfig;
<exit_and_save>; make" from a clean environment

i wasn't able to solve or work around the next one:

make[1]: `arch/arm/include/asm/mach-types.h' is up to date.
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  SYMLINK include/config.h -> board/at91sam9260ek/config.h
  CC      scripts/mod/empty.o
  MKELF   scripts/mod/elfconfig.h
  HOSTCC  scripts/mod/modpost.o
  HOSTCC  scripts/mod/sumversion.o
  HOSTLD  scripts/mod/modpost
  CC      /tmp/barebox-2009.12.0/scripts/mod/empty.o
  CC      /tmp/barebox-2009.12.0/scripts/mod/modpost.o
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:14:19: error: ctype.h: No such file or directory
In file included from /tmp/barebox-2009.12.0/scripts/mod/modpost.c:15:
/tmp/barebox-2009.12.0/scripts/mod/modpost.h:2:20: error: stdlib.h: No such file or directory
/tmp/barebox-2009.12.0/scripts/mod/modpost.h:5:23: error: sys/types.h: No such file or directory
/tmp/barebox-2009.12.0/scripts/mod/modpost.h:6:22: error: sys/stat.h: No such file or directory
/tmp/barebox-2009.12.0/scripts/mod/modpost.h:7:22: error: sys/mman.h: No such file or directory
/tmp/barebox-2009.12.0/scripts/mod/modpost.h:9:20: error: unistd.h: No such file or directory
/tmp/barebox-2009.12.0/scripts/mod/modpost.h:21:1: warning: "ELF_ST_BIND" redefined
In file included from /tmp/barebox-2009.12.0/scripts/mod/modpost.h:10,
                 from /tmp/barebox-2009.12.0/scripts/mod/modpost.c:15:
include/elf.h:119:1: warning: this is the location of the previous definition
In file included from /tmp/barebox-2009.12.0/scripts/mod/modpost.c:15:
/tmp/barebox-2009.12.0/scripts/mod/modpost.h:22:1: warning: "ELF_ST_TYPE" redefined
In file included from /tmp/barebox-2009.12.0/scripts/mod/modpost.h:10,
                 from /tmp/barebox-2009.12.0/scripts/mod/modpost.c:15:
include/elf.h:120:1: warning: this is the location of the previous definition
In file included from /tmp/barebox-2009.12.0/scripts/mod/modpost.c:15:
/tmp/barebox-2009.12.0/scripts/mod/modpost.h:122: error: expected specifier-qualifier-list before 'Elf32_Section'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'fatal':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:57: warning: implicit declaration of function 'vfprintf'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:60: warning: implicit declaration of function 'exit'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'new_module':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:125: warning: implicit declaration of function 'malloc'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:125: warning: passing argument 1 of 'do_nofail' makes pointer from integer without a cast
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'alloc_symbol':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:184: warning: passing argument 1 of 'do_nofail' makes pointer from integer without a cast
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: At top level:
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:252: error: expected declaration specifiers or '...' before 'Elf32_Section'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'export_from_sec':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:254: error: 'sec' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:254: error: (Each undeclared identifier is reported only once
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:254: error: for each function it appears in.)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:254: error: 'struct elf_info' has no member named 'export_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:256: error: 'struct elf_info' has no member named 'export_unused_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:258: error: 'struct elf_info' has no member named 'export_gpl_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:260: error: 'struct elf_info' has no member named 'export_unused_gpl_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:262: error: 'struct elf_info' has no member named 'export_gpl_future_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'grab_file':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:307: error: storage size of 'st' isn't known
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:311: warning: implicit declaration of function 'open'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:312: warning: implicit declaration of function 'fstat'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:316: warning: implicit declaration of function 'mmap'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:316: error: 'PROT_READ' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:316: error: 'PROT_WRITE' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:316: error: 'MAP_PRIVATE' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:316: warning: assignment makes pointer from integer without a cast
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:317: warning: implicit declaration of function 'close'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:319: error: 'MAP_FAILED' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:307: warning: unused variable 'st'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'get_next_line':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:339: warning: implicit declaration of function 'isspace'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'release_file':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:361: warning: implicit declaration of function 'munmap'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'parse_elf':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:373: warning: implicit declaration of function 'perror'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:420: error: 'struct elf_info' has no member named 'modinfo'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:421: error: 'struct elf_info' has no member named 'modinfo_len'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:423: error: 'struct elf_info' has no member named 'export_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:425: error: 'struct elf_info' has no member named 'export_unused_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:427: error: 'struct elf_info' has no member named 'export_gpl_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:429: error: 'struct elf_info' has no member named 'export_unused_gpl_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:431: error: 'struct elf_info' has no member named 'export_gpl_future_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:439: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'handle_modversions':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:467: error: too many arguments to function 'export_from_sec'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:483: warning: implicit declaration of function 'ELF32_ST_BIND'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'find_elf_symbol':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:733: warning: implicit declaration of function 'ELF32_ST_TYPE'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'is_valid_name':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:758: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'warn_sec_mismatch':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:837: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:838: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:843: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:851: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:852: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:858: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:864: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'addend_386_rel':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:888: error: 'R_386_32' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:891: error: 'R_386_PC32' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'addend_mips_rel':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:927: error: 'R_MIPS_HI16' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:931: error: 'R_MIPS_LO16' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:934: error: 'R_MIPS_26' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:937: error: 'R_MIPS_32' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'check_sec_ref':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1039: error: 'EM_386' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1047: error: 'EM_MIPS' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'read_symbols':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1258: error: 'struct elf_info' has no member named 'modinfo'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1258: error: 'struct elf_info' has no member named 'modinfo_len'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1266: error: 'struct elf_info' has no member named 'modinfo'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1266: error: 'struct elf_info' has no member named 'modinfo_len'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1270: error: 'struct elf_info' has no member named 'strtab'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1279: error: 'struct elf_info' has no member named 'modinfo'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1279: error: 'struct elf_info' has no member named 'modinfo_len'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1281: error: 'struct elf_info' has no member named 'modinfo'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'buf_write':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1320: warning: implicit declaration of function 'realloc'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1320: warning: assignment makes pointer from integer without a cast
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'write_if_changed':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1511: error: 'FILE' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1511: error: 'file' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1512: error: storage size of 'st' isn't known
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1512: warning: ISO C90 forbids mixed declarations and code
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1514: warning: implicit declaration of function 'fopen'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1518: warning: implicit declaration of function 'fileno'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1524: warning: passing argument 1 of 'do_nofail' makes pointer from integer without a cast
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1525: warning: implicit declaration of function 'fread'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1531: warning: implicit declaration of function 'free'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1532: warning: implicit declaration of function 'fclose'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1545: warning: implicit declaration of function 'fwrite'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1512: warning: unused variable 'st'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'read_dump':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1581: warning: implicit declaration of function 'strtoul'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c: In function 'main':
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1645: warning: implicit declaration of function 'getopt'
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1648: error: 'optarg' undeclared (first use in this function)
/tmp/barebox-2009.12.0/scripts/mod/modpost.c:1676: error: 'optind' undeclared (first use in this function)
make[1]: *** [/tmp/barebox-2009.12.0/scripts/mod/modpost.o] Error 1
make: *** [common] Error 2

to reproduce from a clean environment:

make ARCH=arm menuconfig
<exit_and_save>
make ARCH=arm CROSS_COMPILE=<your_prefix>

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

    Yo soy como soy y tú eres como eres, construyamos un mundo donde yo
    pueda ser sin dejar de ser yo, donde tú puedas ser sin dejar de ser
    tú, y donde ni yo ni tú obliguemos al otro a ser como yo o como tú
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4                  `-

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