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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@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_