OMAP L138 DSP MMU?

jiang peng

Other Parts Discussed in Thread: OMAPL138

Hi all,

we met a problem that a DDR memory belonged to C674 has been corrupted. we know ARM side has MMU, then we can protect certain area memory as readonly. But any possible way to set in DSP side?

or any practical solution to capture this kind of software problem which wild pointer writes to DDR memory in DSP side. we know DSP should has ability to protect DRAM, but possible for DDR ram?

thanks

Ivan J

over 13 years ago

0 Rahul Prabhu over 13 years ago

TI__Guru** 116170 points

OMAPL138 has a Memory Protection unit(MPU) that can be configured to manage access to memory from system masters. The MPU can record a detected fault, or invalid access, and notify the system through an interrupt. There are two MPUs on the device (MPU1 and MPU2). MPU1 is used to protect/manage access to shared ram while MPU2 is used to manage access to DDR2/mDDR. Please refer to chapter 6 in Technical reference guide for more information.

You might also be interested in looking at the sample code we have distributed on this forum thread below that demonstrates this functionality using MPU2:

http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/158135.aspx#592970

Hope this helps.

Regards,

Rahul

Processors

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OMAP L138 DSP MMU?