i.MX ProcessorsのトピックRe: imx6 hardware breakpoints

imx6 hardware breakpoints

iloskutov — Thu, 25 Aug 2016 13:00:06 GMT

Hi there,

I try to implement gdb-stubs for some kernel. And I can't make hardware breakpoint work on iMX6 hardware. I implement exception handlers and set up ARM debug module with next steps:

- check that debug module in normal power state and registers can be accessed;

- check that OS Lock not enabled;

- reset registers DBGVCR, DBGBCRx, DBGWCRx

- enable monitor mode;

When I set up hardware breakpoints using registers DBGBCRx, DBGBVRx they don't work. I checked this gdb-stub code on qemu and it works.

I found only a few iMX-specific options: CPU debug clocks in CCM module (enabled) and register IOMUXC_GPR10 (debug enabled)

Do I miss something in the iMX-specific configuration of debug module?

Re: imx6 hardware breakpoints

CarlosCasillas — Thu, 01 Sep 2016 15:13:55 GMT

Hi Ivan,

As an option, you could refer to application note AN4553 “Using Open Source Debugging Tools for Linux on i.MX Processors”, which provides information that could be useful regarding debugging on i.MX6.

Hope this will be useful for you.
Best regards!
/Carlos
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Re: imx6 hardware breakpoints

iloskutov — Fri, 02 Sep 2016 14:06:09 GMT

Hi Carlos,

thanks for the support. This document isn't related to my issue. I can use debugging tools for my configuration.

I almost figured out with my issue. Kernel works in secure mode and HW BP doesn't work because I don't have SPIDEN authentication signal. Then I have two options: use debug version of the kernel in non-secure mode or figure out how to enable this signal.

Re: imx6 hardware breakpoints

CarlosCasillas — Mon, 05 Sep 2016 22:49:18 GMT

Hi Ivan,

In this case, you could take a look at the link below:

https://community.nxp.com/thread/316917

FYI, the new link of the mentioned application note is the following:

http://www.nxp.com/files/32bit/doc/app_note/AN4686.pdf