Unable to access I2C Memory Mapped Registers.

[Nandu1]

In the datasheet for intel celeron processor we are able to observe two types of registers which are 1: MemoryMappedI/O registers

2: Memory Mapped registers

For example in some specific interfaces like SMBus has a MemoryMappedI/0 registers whereas I2C interface has Memory Mapped registers. Valid data was read from MemoryMappedI/O registers after configuring the IOSE bit in the SMBUS configuration register whereas incase of Memory Mapped registers invalid data(0xff) were read.

Is there any specific configuration to be enabled for memory mapped registers to read valid data.

[DhannielM_Intel]

Hi Nandu1,

Thank you for posting in the community. To further check this, I will need the exact model of the processor you are looking for. Can you tell me the exact model of the processor you are inquiring about?

Best regards,

Dhanniel M.

Intel Customer Support Technician

[Nandu1 · Accepted solution]

Hi,

So the processor used was Intel(R) Celeron(R) CPU 4503UE 2GHz. We were able to read proper data after "Allow the computer to turn off the device to save power" in the power management tab was disabled. After disabling this option on reading back the memory mapped registers, valid default data was obtained.

Thanks,

Nandu Venu.

[DhannielM_Intel]

Hello Nandu1,

Thanks for sharing this with me. It seems that you have already obtained the valid data you were looking for. Also, thanks for explaining how you obtained the valid data; it will be a great help to other members who are experiencing the same issue.

Would it be alright if we close this inquiry?

Best regards,

Dhanniel M.

Intel Customer Support Technician

[DhannielM_Intel]

Hello Nandu1,

Thank you for posting in the community!

To ensure you receive the most specialized assistance, we have a dedicated forum that addresses these specific concerns. Therefore, I will be moving this discussion to our Embedded Intel® Core™ Processors Forum. This will allow our knowledgeable community and experts to provide you with timely and accurate solutions.

Best regards,

Dhanniel M.

Intel Customer Support Technician

[Diego_INTEL]

Hello  @Nandu1,

Thank you for contacting Intel Embedded Community.

We have received this forum but it seems that you could find the solution, I marked your comment as "Accepted Solution".

Best regards,

@Diego_INTEL