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Keil RTX and bootloading

Johan Moraal
Note: This was originally posted on 25th January 2011 at http://forums.arm.com

Hi all.

I've recently written a secondary bootloader for NXP LPC17xx devices. The design is relatively simple: All our products have embedded serial flash connected with an SPI bus to the micro. The user application is responsible to load a binary image onto the serial flash. When the bootloader starts, it checks the serial flash for a binary image. If one is not found, it jumps to the user application. If one is found, it verifies the integrity of the image by doing a CRC check. If the check passes it begins to update the LPC's flash from the binary image on the serial flash.

I've confirmed that the bootloader application is working properly. Firstly I checked the LPC's flash with a ULINK Pro and made sure the bootloader is not accidentally overridden. Then I uploaded a small application that reads and verifies a large chunk of flash and blinks a led. All these tests succeeded and I'm confident my bootloader works properly.

The problem arises when I try to upload an application which uses the Keil RL-ARM real time OS. When I upload this type of application, nothing happens. I traced the problem with a ULINK and I found that the trace stops at SVC_Handler in startup_LPC17xx.s.

All our RL-ARM based applications run in privileged mode. I know the RTOS uses SVC to access hardware etc in privileged mode.

Is there something I should do in the bootloader in order to support RL apps?
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  • Arm Employee Badge
    Note: This was originally posted on 25th January 2011 at http://forums.arm.com

    Hi there,

    The Keil RTX Kernel should contain the require SVC handler. For some unknown reasons, the SVC vector in your compiled image might be  pointing to the dummy SVC handler in the startup code rather than the OS kernel.  You might need to check your compile and linking options to see if anything can affect it.
    The dummy SVC handler in the startup code should be declared as [WEAK], which mean it can be overridden by a real SVC handler is it is presented. You can also try remove the dummy SVC handler in the startup code to see if it can solve the problem.

    Are you using the source code version or precompiled RTX kernel library?
    If using the source version, make sure HAL_CM3.c is included in the project.
    This contains the "SVC_Handler".

    regards,
    Joseph
Reply
  • Arm Employee Badge
    Note: This was originally posted on 25th January 2011 at http://forums.arm.com

    Hi there,

    The Keil RTX Kernel should contain the require SVC handler. For some unknown reasons, the SVC vector in your compiled image might be  pointing to the dummy SVC handler in the startup code rather than the OS kernel.  You might need to check your compile and linking options to see if anything can affect it.
    The dummy SVC handler in the startup code should be declared as [WEAK], which mean it can be overridden by a real SVC handler is it is presented. You can also try remove the dummy SVC handler in the startup code to see if it can solve the problem.

    Are you using the source code version or precompiled RTX kernel library?
    If using the source version, make sure HAL_CM3.c is included in the project.
    This contains the "SVC_Handler".

    regards,
    Joseph
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