IOMM/Pinmux register write not taking effect

Sigmund Klåpbakken

Part Number: TMS570LS1224
Other Parts Discussed in Thread: HALCOGEN

Tool/software:

I am attempting to implement support for the TMS570LS1224 for Zephyr, and I am currently working on the SCI driver. I am able to get the SCI/LIN module to work just fine, however the other SCI module does not work as I am unable to configure the IOMM.

When writing to the kick registers, the writes do not seem to have any effect as I am reading out 0x0 for both kick0 and kick1 (using GDB). When attempting to write to the PINMMR registers, these do not seem to take any effect either as they remain unchanged. I have checked that the CPU is operating in priviliged mode (system mode), and the ESM register is not reporting any errors (FFFF F558h is 0x0). Is there an initialization step that is neccesary for the IOMM module to function that I have missed?

Currently the setup that is done prior to attempting to set the IOMM registers is:

* PLL/Clock initialization

* PSPWRDWNCLR0-3 cleared (writing 0xffffffff)

* Setting PERIENA bit

Any help is appreciated, as I have no clue why it is not currently working. The repo I am working with is available at https://github.com/OrbitNTNU/zephyr-hw, if that is of any help. I will gladly post any additional information if neccessary, however Im not sure what is relevant to post now.

over 1 year ago

0 jagadish gundavarapu over 1 year ago

TI__Guru 74676 points

Hi Sigmund,

Sigmund Klåpbakken said:
When writing to the kick registers, the writes do not seem to have any effect as I am reading out 0x0 for both kick0 and kick1 (using GDB). When attempting to write to the PINMMR registers, these do not seem to take any effect either as they remain unchanged.

Reading kick registers will always read zero only. Please refer below thread:

(1) TMS570LC4357: Raising privilege mode from user mode - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

You can just try to write unlock sequence without need to verify the kick registers values like as below:

If still not working, then please share one simplest project with the issue for debugging at my end.

--
Thanks & regards,
Jagadish.

0 Sigmund Klåpbakken over 1 year ago in reply to jagadish gundavarapu

Prodigy 10 points

Hi,

Thank you for your response. After a lot of debugging, I found that the offset for the PINMMR registers in the TRM seem to be wrong. In the TRM it states that the
offset for the PINMMR is B10h (from base address FFFF EA00h). However the actual offset seems to be 110h. I suspect the error could have come from the fact that FFFF EA00h + 110h = FFFF EB10h.

After using 110h the functionality now works as expected.

0 jagadish gundavarapu over 1 year ago in reply to Sigmund Klåpbakken

TI__Guru 74676 points

Hi Sigmund,

You are correct.

According to HALCoGen driver the PINMMR registers are starting from 0xFFFFEB10U address. That means PINMMR0 is at 0xFFFFEB10U.

So, its offset is equal to the 0x110 (0xFFFFEB10 - 0xFFFFEA00). The TRM mentioned wrongly as 0xB10.

Thanks for this finding, i am logging this typo issue of TRM and we will correct this in our next document release.

Thanks & regards,
Jagadish.