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

17 Mar 2010

      Because I want to use LED controlled by OR3 to debug the code,so I don't want to clear OR0.
You remind me, so I enable the "Calculate absolute address in FLASH and jump there  " part,
It seems that I get close to the point:  jump to "in_flash:" failed.
Here is the start.S part:
/* 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:
    ...
    ...
The disassemble part :
fff80158:    3c 60 ff f8     lis     r3,-8
fff8015c:    60 63 00 00     ori     r3,r3,0       /*r3 is 0xfff80000 */
fff80160:    38 63 01 6c     addi    r3,r3,364 /*   0xfff8016c    */
fff80164:    7c 68 03 a6     mtlr    r3
fff80168:    4e 80 00 20     blr
fff8016c <in_flash>:
And my text_base is 0xfff80000.  
Something is wrong with the "absolute address" and "relative address",   I am not sure about
that. Expect for your advise.
--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 09:48:42 +0100
jrjr jason622@hotmail.com wrote on 2010/03/17 09:45:08:
...
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 &nbs p;  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?
uhh, Why did you remove that? It is vital code, especially the
/* Calculate absolute address in FLASH and jump there  */ part.
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