On Wed, 03 Feb 2021 16:22:42 +0530 Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> wrote: > On 3 February 2021 3:49:14 PM IST, Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> wrote: > >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? > > > > Sorry, I didn't get your question. The qcom controller can handle several chips, each connected through a different CS (chip-select) line, right? I'm wondering if the firmware running in secure mode has the ability to block access for a specific CS line or if all CS lines have the same constraint. That will impact the way you describe it in your DT (in one case the secure-region property should be under the controller node, in the other case it should be under the NAND chip node).
