hi sascha, El Mon, Jan 04, 2010 at 01:07:58PM +0100 Sascha Hauer ha dit: > On Fri, Jan 01, 2010 at 10:48:26PM +0100, Matthias Kaehlcke wrote: > > El Fri, Jan 01, 2010 at 09:36:29PM +0100 Eric Bénard ha dit: > > > > > Le 01/01/2010 20:48, Matthias Kaehlcke a écrit : > > >> a comment in start_barebox() says 'We are running from RAM now', so i > > >> deduced SDRAM must work. but after having a look at start-arm.S i'm a > > >> little bit confused. as far as i understand the barebox code is copied > > >> to RAM in copy_loop(). what i don't see is where the program counter > > >> is set to the address in RAM? > > >> > > > in arch/arm/cpu/start-arm.S @ line 245 : > > > ldr pc, _start_armboot > > > > i saw this line, but i don't understand how it comes that > > the address at _start_armboot points to RAM and not to the flash. > > When your barebox image is linked to RAM (that is 0x05700000 in your > case) _start_armboot is in RAM, too. > > > > > another question: how does ARCH_TEXT_BASE fit in here? i defined it as > > 0x05700000, but in the barebox image _TEXT_BASE is 0x00000000 > > Have a look at barebox.S, it should look like: > > barebox: file format elf32-littlearm > > > Disassembly of section .text: > > 87f00000 <_start>: > ... thanks for your reply! finally i figured out what was going wrong: after getting compiler errors when using a config file created from scratch, i took a defconfig of another ARM board as starting point. this board defines CONFIG_TEXT_BASE as 0x00000000, in consequence ARCH_TEXT_BASE (0x05700000) of the edb93xx board wasn't used. after setting CONFIG_TEST_BASE to the correct value i got a barebox prompt :) -- Matthias Kaehlcke Embedded Linux Developer Barcelona Debugging is like alien abduction. Large blocks of time disappear, for which you have no explanation .''`. using free software / Debian GNU/Linux | http://debian.org : :' : `. `'` gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4 `- _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox