Newer kernels enable the lockdown feature when secure boot is enabled. This feature also prevents the register mapping into userspace. Thus it is not enough to have CONFIG_IO_STRICT_DEVMEM disabled. Extend the message with the hint also to disable secure boot.
Newer kernels enable the lockdown feature when secure boot is enabled. This feature also prevents the register mapping into userspace. Thus it is not enough to have CONFIG_IO_STRICT_DEVMEM disabled. Extend the message with the hint also to disable secure boot.
Fixes: #2420