AM335x ISDK problem accessing OCMC SRAM

user4599137

Other Parts Discussed in Thread: AM3356

Hello,

I have a problem with accessing OCMC RAM memory (L3 OCMC0) on AM3356 using a customer specific board with customer project (IAR compiler). The problem occurs when the prgramm is writing to OCMC RAM (address = 0x40300000) in 'ICSSMemInit' (icss_emacFwInit.c). Then the programm always holds in exception handler.

If running the example project (ethernet_mac) on AM335x ICE BOARD (ReV: 2.1A) in CCS (Version 6.1.2.00015), there is no problem when the programm is accessing this memory region there.

My question is, what could be the reason for accessing this memory region? Is there something I have to initialize or enable before?

In the chapter 7.2 of the technical reference manual (OCMC-RAM) I doesn´t found any information to it.

Best Regards
Bjoern

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

Check the CM_PER_OCMCRAM_CLKCTRL register (AM335x TRM Rev. N, section 8.1.12.1.9).

0 user4599137 over 9 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

Thank you, but this seems not to be the problem. In both projects the value of this register is 2 (MODULEMODE = ENABLE).

CM_PER_CM_PER_OCMCRAM_CLKCTRL
00000000000000000000000000000010

Best Regards,
Bjoern

0 Biser Gatchev-XID over 9 years ago in reply to user4599137

TI__Guru**** 393215 points

I have asked the RTOS team to look at this too. They will respond here.

0 user4599137 over 9 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

Hi,

the problem could been solved. The OCMC-RAM address (0x40300000) had to been added to the MMU. Now I am able to access this memory region.

Best Regards,
Bjoern

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AM335x ISDK problem accessing OCMC SRAM