OMAP Boot ROM Programming

Sam Gringler

Other Parts Discussed in Thread: AM3715

I really hate it when the proper forum is not around. Can the boot ROM be reprogrammed like an EPROM by grounding a specific pin and then proceeding to flash a new boot ROM. I don't mean the bootloader.

over 12 years ago

0 Michael T over 12 years ago

TI__Expert 6735 points

Sam:

Don't know which device you are working with, but on all our ARM MPUs the boot ROM is set when the device

is manufactured and it cannot be changed.

Regards,

Michael T

PS: Please mark this post as answered via the Verify Answer button below if you think it answers your question. Thanks!

0 Sam Gringler over 12 years ago in reply to Michael T

Prodigy 50 points

Ah, my mistake, I was confused.

0 Sam Gringler over 12 years ago in reply to Sam Gringler

Prodigy 50 points

The more urgent problem I am having is getting the OMAP to boot into general purpose mode. Are there specific pins that can be used to enable this?

0 Michael T over 12 years ago in reply to Sam Gringler

TI__Expert 6735 points

Sam:

GP (general purpose) and HS (high security) devices are available. The are pre-programmed differently at the factory. How do you know that you are

not booting as a GP device? Can you read the ASIC ID? What is the complete part # of the OMAP device you have ordered?

Regards,

Michael T

0 Sam Gringler over 12 years ago in reply to Michael T

Prodigy 50 points

The OMAP3630, I believe that I have read in the documentation that a pin/pinstrap called DEVICETYPE has to be modified to make the device boot into general purpose mode.

0 Michael T over 12 years ago in reply to Sam Gringler

TI__Expert 6735 points

Sam:

The AM3715 TRM has the CONTROL_STATUS register (at 0x480022F0) which has a DEVICETYPE field that is read-only.

It's only defined value is 011 = GP Device. It mentions a value sampled at reset, but does not give details.

I will check on that.

Regards,

Michael T

0 Michael T over 12 years ago in reply to Michael T

TI__Expert 6735 points

Sam:

DEVICETYPE in CONTROL_STATUS register is determined by eFuses that are programmed when the device is

manufactured, not by strapping.

Regards,

Michael T

PS: Please mark this post as answered via the Verify Answer button below if you think it answers your question. Thanks!

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OMAP Boot ROM Programming