| Message ID | 1462909782-14639-3-git-send-email-d-gerlach@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, May 10, 2016 at 02:49:42PM -0500, Dave Gerlach wrote: > Secure variants of DRA7xx and AM57xx SoCs may need to reserve a region > of the SRAM for use by secure software. To account for this, add a child > node to the ocmcram1 node that will act as a placeholder at the start > of the SRAM for the reserved region of memory that may be required > by secure services. The node is added with size 0 so that by default > parts will have the full space available but the bootloader or board dts > file is able to resize the node as needed depending on how much reserved > space is needed, if any, so end users of the ocmcram1 region on HS parts > must be aware that a smaller amount of SRAM than expected may be available. > > Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Reviewed-by: Andreas Dannenberg <dannenberg@ti.com> -- Andreas Dannenberg Texas Instruments Inc
diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi index fd6f74856bd3..f46a265ce315 100644 --- a/arch/arm/boot/dts/dra7.dtsi +++ b/arch/arm/boot/dts/dra7.dtsi @@ -292,6 +292,21 @@ ranges = <0x0 0x40300000 0x80000>; #address-cells = <1>; #size-cells = <1>; + /* + * This is a placeholder for an optional reserved + * region for use by secure software. The size + * of this region is not known until runtime so it + * is set as zero to either be updated to reserve + * space or left unchanged to leave all SRAM for use. + * On HS parts that that require the reserved region + * either the bootloader can update the size to + * the required amount or the node can be overridden + * from the board dts file for the secure platform. + */ + sram-hs@0 { + compatible = "ti,secure-ram"; + reg = <0x0 0x0>; + }; }; /*
Secure variants of DRA7xx and AM57xx SoCs may need to reserve a region of the SRAM for use by secure software. To account for this, add a child node to the ocmcram1 node that will act as a placeholder at the start of the SRAM for the reserved region of memory that may be required by secure services. The node is added with size 0 so that by default parts will have the full space available but the bootloader or board dts file is able to resize the node as needed depending on how much reserved space is needed, if any, so end users of the ocmcram1 region on HS parts must be aware that a smaller amount of SRAM than expected may be available. Signed-off-by: Dave Gerlach <d-gerlach@ti.com> --- arch/arm/boot/dts/dra7.dtsi | 15 +++++++++++++++ 1 file changed, 15 insertions(+)