On 17:56-20240108, Thomas Richard wrote:
This series is the U-Boot part of the work to add the suspend to RAM support for the K3 J7200 EVM board.
During the boot R5 SPL makes a copy of DM-Firmware and TF-A in memory. Resume detection is done by reading a magic value in a pmic register (set by DM-Firmware).
If a resume is detected, R5 SPL run the exit retention sequence of the DDR. Then it load TF-A and DM-Firmware using the copies done during the boot (fit image processing is skipped). Before to start TF-A, R5 SPL writes a magic value in scratchpad ram. This will be used by TF-A to detect that the board is resuming.
The copy of TF-A/DM-Firmware, the SPL stack and malloc are located in a reserved memory region (for the kernel point of view) to avoid any memory corruption.
This version is mostly to test the firewall protection with the suspend to ram. Some comments (for the v2) were not fixed in this version. This series has been tested with the series [1] to enable the firewall. At the end of the resume sequence, TF-A is well protected by the firewall, but OP-TEE remains unprotected.
[1] https://lore.kernel.org/all/20231229-binman-firewalling-v7-0-47ed4af303fe@ti...
And as usual, as I have already responded on https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/25120
My objection to this series mirrors what I have mentioned previously for TFA as well - I am looking for some common sequence to be defined between am62x and J7200 family rather than each go completely tangentially, until that happens, please consider my standing NAK.