FreeRTOS Support Archive
The FreeRTOS support forum is used to obtain active support directly from Real
Time Engineers Ltd. In return for using our top quality software and services for
free, we request you play fair and do your bit to help others too! Sign up
to receive notifications of new support topics then help where you can.
This is a read only archive of threads posted to the FreeRTOS support forum.
The archive is updated every week, so will not always contain the very latest posts.
Use these archive pages to search previous posts. Use the Live FreeRTOS Forum
link to reply to a post, or start a new support thread.
[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [September 2010 Threads] running FreeRTOS on s3c2440A booting from nanPosted by araj on September 29, 2010 Hi
I am trying to run FreeRTOS on s3c2440 ARM920 based SoC.
The development board I am using doesn't have a NOR flash to boot from. or any way to change the address mapping. the chip has an internal RAM called stepping stone which loads first 4K of NAND on reset. The rest of the RAM starts on this board at 0x30000000. I am using IAR development environment and i am able to run my application/OS by downloading it to RAM.. ie 0x00 to 4K ,then continuing at 0x30000000 till 0x38000000.(64MB)
What I don't know is how to start the Application /OS from NAND. the options i can think of are 1.write a loader program at first 4k of NAND ,which is loaded in to stepping stone automatically in reset and the loader will then copy the application/OS to the RAM. but in this case how can I configure the exception vectors lying in the internal RAM/steppingstone once the system starts on the OS/application image in the external RAM. 2.use no loading program.make and burn the application/os image directly on to the beginning of the NAND. on reset the the system starts running the first 4K copied in to the internal RAM.code in the first 4K will copy the rest of the image to external RAM . this seems the solution, but can someone familiar with IAR development environment tell me how to do this.
i thought of doing something with MMU, but i think i am making things more complex. Appreciate any answer
Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.
|