* [U-Boot-Users] compile u-boot with recent toolchain : symbols problem
[not found] ` <c8f10050531022046f3d639@mail.gmail.com>
@ 2005-06-01 6:58 ` Cedric VINCENT
0 siblings, 0 replies; 3+ messages in thread
From: Cedric VINCENT @ 2005-06-01 6:58 UTC (permalink / raw)
To: u-boot
---------- Forwarded message (without attachement) ----------
On 5/30/05, Wolfgang Denk <wd@denx.de> wrote:
> In message <c8f10050526062372e8a833@mail.gmail.com> you wrote:
> >
> > I used to compile U-Boot with ELDK, but I currently need to work with
> > newer toolchain :
> > - binutils-2.16
> > - gcc-3.4.3
>
> This looks line a binutils problem, then. May I ask why you have to
> use binutils-2.16 ?
We want to test recent toolchain, to see if we should migrate or not
(our policy is to keep tools up-to-date, assuming fixes and new
features are more important than new bugs).
>
> And which exact board are we talking about?
We're talking about "ADS Virtex-II Pro Development board", I use ML300
port (and some parts of ML2 and MicroBlaze ports).
>
> > The "__u_boot_cmd_start" symbol value, generated with this new
> > toolchain, is wrong (U-Boot crashes when relocating the command
> > table).
>
> Can you please provide exact data, like the differences between the
> System.map and the u-boot.map files when using binutils-2.16 and
> another, working version of binutils? [Please use the _same_ version
> of GCC for this comparison.]
The problem doesn't appear using binutils-2.16 with GCC provided by
ELDK... So it seems to be a GCC problem.
>
> > There are two new sections between "__u_boot_cmd_start" and
> > ".u_boot_cmd" address :
> > - .data.rel.local
> > - .data.rel
>
> Can you please show exactly what happens?
I attached 3 binaries :
- u-boot_ELDK, which is compiled with binutils-2.11.93.0.2 (20020207)
and gcc-2.95.4
- u-boot_binutils-2.16, which is compiled with binutils-2.16 and gcc-2.95.4
- u-boot_new_toolchain, which is compiled with binutils-2.16 and gcc-3.4.3
As you can see with this command, "__u_boot_cmd_start" is not at the
right place :
bash# powerpc-405-linux-gnu-nm u-boot_new_toolchain | sort
[...]
0002ab8c A __u_boot_cmd_start
0002ab8c D init_sequence
0002abb8 d failed
0002abbc D op_table
0002ac24 D stdio_names
0002ac30 d av_
0002b038 D z_errmsg
0002b058 D __u_boot_cmd_autoscr
0002b070 D __u_boot_cmd_bdinfo
0002b088 D __u_boot_cmd_reset
0002b0a0 D __u_boot_cmd_go
[...]
Since U-Boot uses the address of "__u_boot_cmd_start" to point to the
first entry of the command table, U-Boot crashes when relocating this
table. Here, the address of "__u_boot_cmd_start" should be 0x0002b058.
I noticed that symbol "init_sequence" belongs to section ".data.rel"
and symbols "failed", "op_table", "stdio_names", "av_" and "z_errmsg"
belong to section ".data.rel.local".
As you can see with this command, these new sections are above the
".u_boot_cmd" section :
bash# powerpc-405-linux-gnu-readelf -S u-boot_new_toolchain
[...]
[ 1] .text PROGBITS 00010000 000094 016684 00 AX 0 0 4
[ 2] .resetvec PROGBITS 00026684 016718 000004 00 AX 0 0 1
[ 3] .rodata PROGBITS 00026688 01671c 003500 00 A 0 0 4
[ 4] .reloc PROGBITS 00029c00 019c94 000ab8 00 WA 0 0 1
[ 5] .data PROGBITS 0002a6b8 01a74c 0004d4 00 WA 0 0 4
[ 6] .data.rel PROGBITS 0002ab8c 01ac20 00002c 00 WA 0 0 4
[ 7] .data.rel.local PROGBITS 0002abb8 01ac4c 0004a0 00 WA 0 0 4
[ 8] .u_boot_cmd PROGBITS 0002b058 01b0ec 000348 00 WA 0 0 4
[...]
So "__u_boot_cmd_start" points to the start of the ".data.rel" section
instead of the start of ".u_boot_cmd" section.
These new sections are disassembled in attached files
"section_.data.rel.local_dump" and "section_.data.rel_dump".
Thanks.
Best regards, Cedric VINCENT.
> >
> > I don't know what these (new) sections are, but the problem can be
> > solved in "u-boot.lds" :
> > - __u_boot_cmd_start = .;
> > .u_boot_cmd : { *(.u_boot_cmd) }
> > __u_boot_cmd_end = .;
> > + __u_boot_cmd_start = ADDR(.u_boot_cmd);
>
> I would like to understand this problem first before deciding about
> any fixes or patches.
>
> Thanks.
>
> Best regards,
>
> Wolfgang Denk
>
> --
> Software Engineering: Embedded and Realtime Systems, Embedded Linux
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
> "The computer programmer is a creator of universes for which he alone
> is responsible. Universes of virtually unlimited complexity can be
> created in the form of computer programs." - Joseph Weizenbaum,
> _Computer Power and Human Reason_
>
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