SK-AM62: Miscellaneous questions

Kazuhiko Hirano

Part Number: SK-AM62

Hello,

My customer is evaluating SK-AM62(E3A) with default Linux image and facing some issues and has the following questions.
Please respond to those questions.

Q1: The following errors occur when the CPU core is taken offline and brought online, why?

Procedure: Executes the following on Linux Console.
echo 0 > /sys/devices/system/cpu/cpu0/online
CPU0: shutdown
psci: CPU0 killed
echo 1 > /sys/devices/system/cpu/cpu0/online <-- This command fails
CPU0: failed to come online
CPU0: failed in unknown state: 0x0

Q2: Bluetooth (WL18MOD) is not found, why?
Procedure: Executes the following on Linux Console.
hciconfig up <-- This command fails
Can’t get device info: No such device

Q3: How can the power consumption (VDD_core) is measured?
Procedure: Executes the following on Linux Console.
i2cget -y 1 0x40 0 w
0x2741
i2cget -y 1 0x40 1 w
0xc08c <-- How to interpret this code to power consumption?
i2cget -y 1 0x40 2 w
0x9f02 <-- How to interpret this code to power consumption?

Best regards,

K.Hirano

over 2 years ago

0 Nick Saulnier over 2 years ago

TI__Guru** 103490 points

Hello Hirano-san,

To confirm: Are you trying to stop one of the A53 cores in the Linux A53 cluster? Or are you trying to stop a different processor core?

I am reassigning your thread with the assumption that you are trying to stop one of the A53 Linux cores.

Regards,

Nick

0 Kazuhiko Hirano over 2 years ago in reply to Nick Saulnier

TI__Genius 15438 points

Nick,

Thank you for your response.
For Q1, yes my customer is trying to stop one of the four cores and resume it again. Then, they receive the errors described above.

I look forward to getting answers to Q1, Q2 and Q3 soon.

Best regards,

K.Hirano

0 Bin Liu over 2 years ago in reply to Kazuhiko Hirano

TI__Guru**** 171481 points

Hi Hirano-san,

Re. Q1 - which version of the Processor SDK do you use? Turning CPU on/off at Linux runtime is broken in current SDK v8.6. It was working back in SDK8.3. This issue has been reported to our sw dev team.

0 Bin Liu over 2 years ago in reply to Bin Liu

TI__Guru**** 171481 points

BTY, all your 3 questions belong to different domains, so this thread would have to be assigned to each expert one at a time. Please don't expect to get all answers at the same time.

Therefor the fast way to get support is create multiple e2e threads for irrelevant questions - one question per e2e thread, so all questions got assigned to domain experts at the same time.

0 Kazuhiko Hirano over 2 years ago in reply to Bin Liu

TI__Genius 15438 points

Bin,

Thank you for your response, I created ew threads for Q2 and Q3.

For Q1, my customer tried SDK8.3 and succeeded in resuming CPU1, CPU2 and CPU3.
However, he still gets the same error for CPU0 even SDK8.3.

Anyway, does TI plan to fix this error at next SDK revision? Around when will it be released?

Best regards,

K.Hirano

+1 Bin Liu over 2 years ago in reply to Kazuhiko Hirano

TI__Guru**** 171481 points

Hi Kirano-san,

Yes, the CPU runtime on/off issue will be resolved in the next SDK, which is planned to be released in July this year.

Processors

Processors forum

SK-AM62: Miscellaneous questions