New kernels don't get CPU information from U-Boot ATAGS and
so the /proc/cpuinfo file does not have the Hardware/Revision
lines filled in.
This patch gets the CPU model from the device tree information
at /proc/device-tree/compatible.
For backwards compatibility, if the CPU model cannot be retrieved
from this file, we try to get it from /proc/cpuinfo.
Signed-off-by: Hector Palacios <hector.palacios@digi.com>
Reviewed-by: Javier Viguera <javier.viguera@digi.com>
https://jira.digi.com/browse/DEL-797
Hector Palacios