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

[jrjr]

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 at l(r3)
    li    r5, 0x7fff
    and    r4, r4, r5
    stw    r4, IM_OR0 at l(r3)

    /* Calculate absolute address in FLASH and jump there        */
    /*--------------------------------------------------------------*/

    lis    r3, CONFIG_SYS_MONITOR_BASE at h
    ori    r3, r3, CONFIG_SYS_MONITOR_BASE at 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 at hotmail.com
> CC: u-boot at lists.denx.de
> From: joakim.tjernlund at transmode.se
> Date: Wed, 17 Mar 2010 08:05:23 +0100
> 
> jrjr <jason622 at 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 at hotmail.com
> > > CC: u-boot at lists.denx.de
> > > From: joakim.tjernlund at 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
> > >
> >
> > 聊天+搜索+邮箱 想要轻松出游,手机MSN帮你搞定! 立刻下载！
 		 	   		  
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