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This LPM > metadata area is firewalled to be accessed only by TIFS. > > U-Boot R5 SPL/TIFS will use this area to save and restore: > - ATF context > - ATF certificate information > - OPTEE certificate information > - DM image (which has been copied in memory at boot time by U-Boot > R5-SPL) > > At resume, U-Boot R5 SPL is executed and detects that the board is > resuming (with a flag set in the PMIC), then it: > - brings out of retention the DDR > - retrieves the LPM memory region from DTS > - authenticates certificates from LPM memory region and applies firewalls > - asks TIFS to restore TFA and its own minimal context > - starts TFA on remote proc > - loads back DM image from memory and jumps to DM > > https://software-dl.ti.com/tisci/esd/latest/2_tisci_msgs/pm/lpm.html#lpm-msg-lpm-save-addr > > As this is used by U-Boot SPL, bootph-pre-ram is added. > > NB: This memory region is not part of DM memory (which is not retained > at suspend) > > Suggested-by: Udit Kumar > Signed-off-by: Prasanth Babu Mantena > Signed-off-by: Richard Genoud (TI) > --- > .../ti/k3-j784s4-j742s2-ti-ipc-firmware-common.dtsi | 12 ++++++++++-- > 1 file changed, 10 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-ti-ipc-firmware-common.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-ti-ipc-firmware-common.dtsi > index d08fd3ff8a89..51b2d11ab5d6 100644 > --- a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-ti-ipc-firmware-common.dtsi > +++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-ti-ipc-firmware-common.dtsi > @@ -6,6 +6,12 @@ > */ > > &reserved_memory { > + lpm_memory_region: memory@9e500000 { > + reg = <0x00 0x9e500000 0x00 0x00300000>; > + no-map; > + bootph-pre-ram; > + }; > + > mcu_r5fss0_core1_dma_memory_region: memory@a1000000 { > compatible = "shared-dma-pool"; > reg = <0x00 0xa1000000 0x00 0x100000>; > @@ -261,8 +267,10 @@ &mcu_r5fss0_core0 { > status = "okay"; > mboxes = <&mailbox0_cluster0 &mbox_mcu_r5fss0_core0>; > memory-region = <&mcu_r5fss0_core0_dma_memory_region>, > - <&mcu_r5fss0_core0_memory_region>; > - memory-region-names = "dma", "firmware"; > + <&mcu_r5fss0_core0_memory_region>, > + <&lpm_memory_region>; > + memory-region-names = "dma", "firmware", "lpm-metadata"; > + bootph-pre-ram; Reviewed-by: Udit Kumar > }; > > &mcu_r5fss0_core1 {