On Wed, 03 Feb 2021 15:42:02 +0530 Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> wrote: > >> > >> I got more information from the vendor, Telit. The access to the 3rd > >partition is protected by Trustzone and any access in non privileged > >mode (where Linux kernel runs) causes kernel panic and the device > >reboots. Out of curiosity, is it a per-CS-line thing or is this section protected on all CS? > > > >Ok, so this is not a chip feature but more a host constraint. > > > >In this case it would be a good idea to add a host DT property which > >describes the zone to avoid accessing it. Something like: > > > > secure-area/secure-section = <start length>; > > > >From the core perspective, we should parse this property early enough > >and return -EIO when trying to access this area. FWIW, I'm not sure making it part of the core is a good idea, at least not until we have a different platform with a same needs. The controller driver can parse it and return -EACCESS (or -EIO) when this section is accessed.
