PCA10056 v3.0.1 cannot run the matter example of NCS2.6.0

Question

Dear support team, I now have three PCA10056 v3.0.1 versions of nRF52840-DK. After connecting the development board to the PC, I downloaded the \v2.6.0
rf\samples\matter\light_switch example. I opened the serial port to view the log. There is no log information, and LED1 does not flash. , indicating that the matter example is not running; download the \v2.5.2
rf\samples\matter\light_switch example, open the serial port to view the log, there is matter log output, and LED1 will flash, indicating that the matter example has been run; 3 PCA10056 v3.0.1 phenomena consistent. Please tell me why the matter example of ncs2.6.0 cannot be run on the PCA10056 v3.0.1 development board? Please help analyze the cause and give a solution. I found an nRF52840-DK with PCA10056 v0.9.2, which can run the matter example of ncs2.6.0. 
 
 BR, 
 Zero

Hieu · Accepted Answer

Hi Zero, 
 A fix was made in the Zephyr upstream: https://github.com/zephyrproject-rtos/zephyr/pull/71373 . 
 and cherry picked into NCS: https://github.com/nrfconnect/sdk-nrf/pull/14812 . 
 It should be fixed in the next release. I cannot comment on when that is, however. 
 You could try to cherry pick the fix as well. The issue can be reproduced on a factory condition DK, not necessarily the 3.0.1 or newer, if you want to verify the fix. I have not verified this, but to "unfix" a DK to be susceptible to the issue again, you can use this overlay: 
 &mx25r64 {
	writeoc = "pp";
	readoc = "fastread";
}; 
 BR, 
 Hieu

PCA10056 v3.0.1 cannot run the matter example of NCS2.6.0

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