not stable on cortexM4.

[braimp]

hi guys,
     i did the porting on cortexM4 (128K sram, 4MByte psram, 4M xip norflash, i cache, d cache, 52MHz) based on RK27.
     i can play .wav file on sdcard well.
     but what strange is:
     when i add some log, program crash.
     when i delete some log, program crash.
     when i add a line code , program crash.
     ......
   
      i change toolchain to arm-none-eabi-gcc.!
     any ideas?

[wodz]

Could you provide:
1) Sources you are using
2) More info about the target board?

BTW. It usually good thing to catch us on IRC

[braimp]

Could you provide:
1) Sources you are using
2) More info about the target board?

BTW. It usually good thing to catch us on IRC

i am thinking about tool-chain issue.maybe the psram issue.

source code is latest from git.
my borad is our own chip on cortexm4.

porting based on rk27.

[wodz]

You know, rk27 is arm7-ejs core which is very different from cortex-m4. I can be really anything.

[braimp]

You know, rk27 is arm7-ejs core which is very different from cortex-m4. I can be really anything.

yes.i just use its macros.haha.

[gevaerts]

So you're using a build from unmodified source on a different CPU core than it was written for and you get crashes? Why are you surprised by this?

[saratoga]

We don't have Thumb2 branch in the target tree.  From what I understand, its similar to ARMv6, but not compatible.  I suppose things like the MMU functions and such need to be ported to Thumb2. 

[braimp]

hi guys,
     my fault.
     psram is not stable.

     now rockbox is running on my cortexm4 fpga now.
     mp3 and wav are ok.
     thx.