[arm-gnu] Placing variable at absolute address in RAM

[JM]

Thank you, I'm a little closer.  It compiles now.  But I think there could be another problem that was occurring from the start.  I checked the map file for all these variables (structs mostly) that didn't seem to function when in .sram1.  I compiled it without specifying a section, then they appear in the mapfile.  Also, they are all indicated as being .bss, so I suppose they are uninitialized.  


But when I use __attribute__ to force it into .sram1, some variables no longer appear in the map file, BUT, the space being used is shown.  Below is an excerpt.  See how in main.o all the variables are listed, but in lwiplib.o, only the variable "hello" is displayed?  "hello" is a variable I declared to see if it appears in the map file.

/***two declarations that should be appearing in lwiplib.o, but aren't ***/

static struct etharp_entry arp_table[ARP_TABLE_SIZE] __attribute__ ((section(".sram1")));  /*this variable's name not appearing in mapfile*/
unsigned char *hello  __attribute__ ((section(".sram1")));                                                        /*this variable's name appears in mapfile*/

/*******************************************************/

.sram1          0x20000000      0x16c load address 0x00028c70
 *(.sram1_data)
                0x20000000                sram1_bss = .
 *(.sram1_bss)
 .sram1         0x20000000       0x64 main.o
                0x20000000                netbuf_start
                0x20000004                netbuf_wr
                0x20000008                netbuf_rd
                0x2000000c                netbuf_end
                0x20000010                outbuf1
                0x20000014                outbuf2
                0x20000018                netbuf
                0x2000001c                aacFrameInfo
                0x2000002c                mp3FrameInfo
                0x2000003c                packetq
 .sram1         0x20000064       0x10 ./stream-core/dac.o
                0x20000064                dac_fill
 .sram1         0x20000074       0xf8 ./general-core/lwiplib.o
                0x20000168                hello
                0x00028c70                sram1_loadaddr = LOADADDR (.sram1)



________________________________
 From: 42Bastian <list-bastian.schick at sciopta.com>
To: arm-gnu at codesourcery.com 
Sent: Friday, April 6, 2012 11:26 AM
Subject: Re: [arm-gnu] Placing variable at absolute address in RAM
 
Hi

> bi/4.5.2/../../../../arm-none-eabi/bin/ld.exe: section .data loaded at [00028bc0,00028bcf] overlaps section .sram1 loaded at [00028bc0,00028c7b]
> collect2: ld returned 1 exit status
> cs-make: *** [RTOSDemo.axf] Error 1

You should not mix  AT > with AT(...).


-- 
42Bastian
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