Re: [U-Boot] Instructions in TEXT section can not load data from other section

17 Mar 2010


      And I have made some change in cpu/mpc8260/start.S, I removed following lines:
#ifndef CONFIG_SYS_RAMBOOT
    /* When booting from ROM (Flash or EPROM), clear the        */
    /* Address Mask in OR0 so ROM appears everywhere        */
    /*--------------------------------------------------------------*/
lis    r3, (CONFIG_SYS_IMMR+IM_REGBASE)@h
    lwz    r4, IM_OR0@l(r3)
    li    r5, 0x7fff
    and    r4, r4, r5
    stw    r4, IM_OR0@l(r3)
/* Calculate absolute address in FLASH and jump there        */
    /*--------------------------------------------------------------*/
lis    r3, CONFIG_SYS_MONITOR_BASE@h
    ori    r3, r3, CONFIG_SYS_MONITOR_BASE@l
    addi    r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
    mtlr    r3
    blr
in_flash:
#endif    /* CONFIG_SYS_RAMBOOT */
Becasue I don't think I need to clear the Address Mask in OR0, Is there anything wrong?
--JRJR
...
Subject: RE: [U-Boot] Instructions in TEXT section can not load data from other	section
To: jason622@hotmail.com
CC: u-boot@lists.denx.de
From: joakim.tjernlund@transmode.se
Date: Wed, 17 Mar 2010 08:05:23 +0100
jrjr jason622@hotmail.com wrote on 2010/03/17 07:28:04:
...
Thanks for your advise, I compile with -mrelocatable. If I remove this flag,
Error is shown:
ERROR: Your compiler doesn't generate .fixup sections!
My host gcc is  gcc 4.1.2 20080704 (Red Hat 4.1.2-44),
I try different toolchain:
powerpc-unknown-linux-gnu-gcc  gcc version 4.4.3 (crosstool-NG-1.6.0)
ppc_82xx-gcc gcc version 4.2.2   from ELDK
powerpc-603-linux-gnu-gcc gcc version 4.1.0 from crosstool 0.43
The problem is still there    : (
--JRJR
Check your linker script(*.lds) for .fixup sections and compare
that to a working working board.
OR
Your TEXT_BASE is wrong
...
...
Subject: Re: [U-Boot] Instructions in TEXT section can not load data from
other section
...
To: jason622@hotmail.com
CC: u-boot@lists.denx.de
From: joakim.tjernlund@transmode.se
Date: Tue, 16 Mar 2010 09:50:42 +0100
...
Hi, everyone.
I have got a problem when I porting U-BOOT to my board
with MPC8247. My configuration file is based on the MPC8260ADS_config.
The problem is : The instruction in TEXT section can not load data in
other (DATA) sections. It seems there is a relocation to the data section .
For example: If I use
for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
if ((*init_fnc_ptr) () != 0) {
hang ();
}
}
I can't jump to functions in init_sequence[] ;
If I called functions such as get_clocks() in board_init_f , it works fine.
So the code in board_init_f can not load address in init_sequence[] , because
init_sequence[] is out of TEXT section.
The same thing happens wit h iop_conf_tab[][], and strings used by "puts".
Anyone there has the same problem? Or know the point? Pls help!
Yes, that is a relocation problem. Do you compile with -mrelocatable?
If so, you might have a broken toolchain that don't produce .fixups
jocke
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