[ECOS] Re: Troubles when develop app with Kwikstik

[Ilija Kocho <ilijak@siva.com.mk>]

On 21.08.2012 05:52, tangwei wrote:
> Dear all,
>
> I have a FreeScale's Kwikstik board,and have troubles when develop
> with it as below
>
> setp1:Use the default redboot setting for KwikStik,and then download
> the bin into the flash,
> then connect the COM,I get the below string on the computer,it seems
> the redboot is OK.
>
> Platform: Freescale KwikStik (Cortex-M4)
> RAM: 0x1fff8000-0x20007000 [0x1fffb6a8-0x20007000 available]
> RedBoot>
>
> step2:Prepare the app from the examples directory (ELF fomart)
> If I use the default kernel setting(the startup setting is ROM),build
> the examples with the kernel,
> get the hello(elf fomart).
> then use the gdb tool download the hello
> (gdb) set remotebaud 38400
> (gdb) target remote /dev/ttyUSB0
> Remote debugging using /dev/ttyUSB0
> 0x00003aa2 in ?? ()
> (gdb) load hello
> Loading section .rom_vectors, size 0x8 lma 0x0
> Load failed
> (gdb)
>

You can't load ROM startup with RedBoot. There is an experimental FLASH
startup
http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001623 that will enable
loading applications in Flash by means of Internal Flash driver
http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001561 . With these you
should be able to load and run application, but GDB usage is limited
because current GDB stub doesn't support hardware breakpoints.

> if I use the starup setting SRAM for the kernel,then do as above
>
> (gdb) set remotebaud 38400
> (gdb) target remote /dev/ttyUSB0
> Remote debugging using /dev/ttyUSB0
> 0x00003aa2 in ?? ()
> (gdb) load hello
> Loading section .rom_vectors, size 0x8 lma 0x1fff8400
> Loading section .ARM.exidx, size 0x10 lma 0x1fff8408
> Loading section .text, size 0x4dbc lma 0x1fff8418
> Ignoring packet error, continuing...
> Ignoring packet error, continuing...
> Ignoring packet error, continuing...
> Ignoring packet error, continuing...
> Ignoring packet error, continuing...
>
> I want to download the app to the RAM for debug,so I think the second
> kernel startup setting is right,
> but I don't know somewhere else to make the change,
> can anyone help me,where is the bug, and how to debug?
>

SRAM startup is not intended for use with Redboot but with JTAG. You can
use OpenOCD or J-Link.

I hope this helps.

Ilija


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