> -----Original Message----- > From: Baruch Siach [mailto:baruch@xxxxxxxxxx] > Sent: dinsdag 8 maart 2011 12:22 > To: Vanalme Filip > Cc: barebox@xxxxxxxxxxxxxxxxxxx > Subject: Re: test app > > Hi Vanalme, > > On Tue, Mar 08, 2011 at 11:09:57AM +0100, Vanalme Filip wrote: > > As a start, I just took over your Makefile and a minimal source file : > > > > __asm__ (".text\n" > > ".globl _start\n" > > "_start:\n" > > "ldr sp, =0xA7E00000\n" > > "bl main\n" > > "stop:\n" > > "b stop\n" > > ); > > > > int main (int argc, char *argv[]) > > { > > return 0; > > } > > > > I think I might still miss something because the assembler part gives me errors > e.g. > > " Error: no such instruction: 'ldr sp,=0xA7E00000' " > > " Error: no such instruction: 'bl main' " > > " Error: no such instruction: 'b stop' " > > > > Maybe a tab/space related issue ? > > Works for me (using the CodeSourcery toolchain): > > $ cat baretest.c > __asm__ (".text\n" > ".globl _start\n" > "_start:\n" > "ldr sp, =0xA7E00000\n" > "bl main\n" > "stop:\n" > "b stop\n" > ); > > int main (int argc, char *argv[]) > { > return 0; > } > $ arm-none-linux-gnueabi-gcc -Wall -Os -nostdlib baretest.c -o baretest.elf -Wl,- > Ttext=0x78000000 > $ arm-none-linux-gnueabi-objdump -S baretest.elf > > baretest.elf: file format elf32-littlearm > > > Disassembly of section .text: > > 78000000 <_start>: > 78000000: e59fd00c ldr sp, [pc, #12] ; 78000014 <main+0x8> > 78000004: eb000000 bl 7800000c <main> > > 78000008 <stop>: > 78000008: eafffffe b 78000008 <stop> > > 7800000c <main>: > 7800000c: e3a00000 mov r0, #0 > 78000010: e12fff1e bx lr > 78000014: a7e00000 .word 0xa7e00000 > > baruch > [Filip] Baruch, Compiling and linking seems to work well now. When I dump the .elf, I see that the start address is 0xA7E00000. That's what I wanted. However, when loading the app in ram and executing it, I see that it tries to start from 0xA0000000 (this is the base address of the RAM section) : barebox:/test tftp testapp.bin TFTP from server 10.0.48.80 ('testapp.bin' -> 'testapp.bin') barebox:/test cp testapp.bin /dev/ram0 barebox:/test go /dev/ram0 ## Starting application at 0xA0000000 ... ?¶/ÿ'.e¢Óøñ_ _øýàõÒÿ ïO ÿOÿðzþðöàþ A'}®ÿ ùý"õÿ?O¿PP¼@Y }¸m ×´ï@ïðx`G-/ Should I specify an address when executing 'go' or 'cp' ? Isn't it loading the app always at the beginning of the RAM space, i.e. 0xA0000000 ? Filip > -- > ~. .~ Tk Open Systems > =}------------------------------------------------ooO--U--Ooo------------{= > - baruch@xxxxxxxxxx - tel: +972.2.679.5364, http://www.tkos.co.il - _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
