I want to write a program in assembly where my code is resident from location, say, 0x20000. On reset, code execution should start from location 0x20000. Kindly let us know how to write the initial code. I tried the following:
AREA ARMex, CODE, AT 0x00000000 ENTRY start B here org 0x20000 here: MOV r0, #10 MOV r1, #3 ADD r0, r0, r1 END
On reset, code execution should start from location 0x20000 I never have programmed an ARM in my life, but: no way are you going to persuade any CPU to change the actual code execution start address for a reset. Certainly not by any means software could help you with. The location of the reset vector is hardwired into the processor --- it has to be.
If you look at the ARM7 TDMI-s memory mapping it has 256 KB on chip Non volatile Memory from 0x0000 0000 to 0x0000 3FFF.It has 16 KB on chip static RAM from 0x4000 0000 to 0x4000 1FFF. If I am storing my program at location starting from 0x4000 0000 ,I would like to know how I can make my program to start its execution from the address 0x40000000 rather than 0x00000000 which it does normally when I start execution. Remember I want my program to start its execution automatically at 0x40000000 without giving a branch orjump at 0x00000000. looking forward to hear.
No need to re-state what you're trying to do --- I understood you the first time. What you're trying to do is impossible. You're asking a tree to fly.
It really depends on the device that he is using. What type of controller are you using? Does this controller provide a special memory REMAP feature? Reinhard
Hi I am using Philips LPS2294 I am looking into the manual for remapping.If u come across any ided do let me know. Thanks in advance.
Hi I am using Philips LPS2294 I am looking into the manual for remapping.If u come across any idea do let me know. Thanks in advance.
Hi I am using Philips LPC 2294 I am looking into the manual for remapping.If u come across any idea do let me know. Thanks in advance.
What you're trying to do is impossible. You're asking a tree to fly evidently you do not have hurricanes or tornadoes in Germany.
The Philips devices do not have a REMAP feature. Also 0x4000 0000 is RAM. Do you really want to loose program when you power off? Maybe you should take a look to C:\Keil\ARM\Boards\Keil\MCB2100\Blinky. This example is configured for execution from Flash and RAM. In this way you can see what needs to be done. Reinhard
"What you're trying to do is impossible. You're asking a tree to fly." Apparently he's asking the wrong kind of tree.