From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erick Castillo Date: Wed, 14 Jul 2004 20:30:07 -0700 Subject: [U-Boot-Users] AT91RM9200 -> UBoot and arm/thumb interworking Message-ID: <200407142030211.SM00572@ENG2> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hello, I'm getting started with an AT91RM9200 development kit from atmel and am having trouble starting a simple application with UBoot. If I compile my application into 32bit arm code only, I can successfully load and run some simple startup code through the 'loadb' and 'go' commands that UBoot offers. I have two files: startup.s and main.c. "startup.s" does nothing more than set up some vector branches, initializes a stack, and jumps to main. All main does is drive a user led on the development board. As I said, compiling this in 32 bit arm seems to work fine when I load to 0x2000 0000. If I try to compile the main.c source code in thumb mode, then the 'bx' branch to main fails and the code does not run. The code preceding the branch is: . ldr r0, =main mov r13, pc bx r0 I was wondering if there was some initializations made by UBoot that would prevent it from loading thumb code. Any help/ideas would be especially useful. Thanks. --Erick -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.denx.de/pipermail/u-boot/attachments/20040714/802a79df/attachment.htm