undefined symbol __PRU_CREG_MEM

[Guidomo]

Hi,
when I try to compile the blinkled_pru.c file I get the following output:

undefined symbol: __PRU_CREG_MEM blinkled_pru.obj
first referenced in file: blinkled_pru.obj

error: unresolved symbols remain
error: errors encountered during linking; "PRU_tests.out" not built

Compilation failure

hope somebody can help me.

[jadonk]

Any update on this issue?

[jadonk]

You need to specify the stuff in lnk.cmd and then it works. Here's how I build blinkled.out: https://gist.github.com/jadonk/a6432fde48408e72fdd7

Note that I didn't run the hex conversion at this point because bin.cmd is missing. Also, you'll need to install the PRU compiler on the BeagleBone using 'apt-get update && apt-get install ti-pru-cgt-installer'.

[mattcarpenter]

@Guidomo To elaborate on @jadonk's suggestion in his Gist, you need to add the PAGE 2 block to your existing lnk.cmd (don't just replace the MEMORY section.) I'm using AM3359_PRU.cmd. Once I made my MEMORY section look like this, I was able to compile and link blinkled:

MEMORY
{
    PAGE 0:
      PRUIMEM:   o = 0x00000000  l = 0x00001000  /* 8kB PRU0 Instruction RAM */
    PAGE 1:
      PRUDMEM:   o = 0x00000000  l = 0x00001000  /* 8kB PRU Data RAM 0 */
    PAGE 2:
       MEM      : org = 0x00026000   len = 0x00002000 CREGISTER=4
}