OMAPL138 DSP Wake Up

Marc48067

Expert 2000 points

Other Parts Discussed in Thread: OMAPL138

Hello,

I've got a question about the dsp wake up in the omapl138. As mentioned in sprugm7d.pdf chapter 13.2 the arm must write the dsp boot address vector to DSP_ISTP_RST_VAL before starting the dsp. The dsp boot address vector is c_int00() which is located in .sysinit section of dsp bios as shown in the map file below.

.sysinit 0 11819b80 00000500

11819b80 00000320 bioscfg.obj (.sysinit)

11819ea0 000000c0 bios.a674 : boot.o674 (.sysinit) <----- c_int00()

11819f60 000000c0 : mem_init.o674 (.sysinit)

1181a020 00000060 : tsk_init.o674 (.sysinit)

What is the best way to link c_int00() to a fix address so that tha arm can write this fix address to DSP_ISTP_RST_VAL and then start the dsp?

Thank you

over 15 years ago

0 David Friedland over 15 years ago

TI__Mastermind 18320 points

Marc,

If you are using DSP/BIOS, the symbol _c_int00 is placed in a section named .sysinit. You can create a new memory section and put .sysinit in it.

See the Wiki article:

http://processors.wiki.ti.com/index.php/Accessing_c_int00

0 Peter Steinberg over 15 years ago in reply to David Friedland

Expert 1640 points

I'm using SYS/BIOS 6.30.02.42.

_c_int00 is in the ".text" segment and it moves around when I change my code.

What is the supported way to fix it's address to boot it properly under BIOS 6?

Thanks,

Peter Steinberg

0 David Friedland over 15 years ago in reply to Peter Steinberg

TI__Mastermind 18320 points

Peter,

Try something like the following in your custom linker cmd file:

SECTIONS { .text:_c_int00 > 0xc3000000 }

0 Peter Steinberg over 15 years ago in reply to David Friedland

Expert 1640 points

That works.

Thanks,

Peter

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OMAPL138 DSP Wake Up