Question

I am trying to read/write to a I/O Memory Register of a platform device but the system hangs as soon as it goes to the line where read/write is performed.

I was able to check the following:

• request_mem_region returns OK

• the correct physical addr was requested (ioremap is OK)

• a valid logical address is returned; used this to read the
  register; ioread32(logical_addr)

I am quite new to the linux kernel, is there a way that the I/O registers are disabled?
I checked /proc/iomem, and the memory region that I wish to access appears in the list.

Where to go from here?

Answer 1

I found the answer. Thank you for your response Longfield.
I forgot to check the name used by the driver. It didn’t match the device name being registered. They should match.