I am using the official MCIMX7SABRE development board. My Linux version is 4.9.88.
When I was doing serial port data transmission and testing, I found that the kernel was printing:
Alloc_contig_range: [b0900, b0914) PFNs busy
Alloc_contig_range: [b0920, b0934) PFNs busy
What is the cause of this? Is there any way to fix it?
I look forward to anyone's reply.