The A80 stores some magic flags in a portion of the secure SRAM. The BROM jumps directly to the software entry point set by the SMP code if the flags are set. This is required for CPU0 hotplugging.
Signed-off-by: Chen-Yu Tsai <[email protected]> --- arch/arm/boot/dts/sun9i-a80.dtsi | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm/boot/dts/sun9i-a80.dtsi b/arch/arm/boot/dts/sun9i-a80.dtsi index 1507bd2a88f0..0695215634d4 100644 --- a/arch/arm/boot/dts/sun9i-a80.dtsi +++ b/arch/arm/boot/dts/sun9i-a80.dtsi @@ -366,6 +366,26 @@ */ ranges = <0 0 0 0x20000000>; + sram_b: sram@00020000 { + /* 256 KiB secure SRAM at 0x20000 */ + compatible = "mmio-sram"; + reg = <0x00020000 0x40000>; + + #address-cells = <1>; + #size-cells = <1>; + ranges = <0 0x00020000 0x40000>; + + smp-sram@1000 { + /* + * This is checked by BROM to determine if + * cpu0 should jump to SMP entry vector + */ + compatible = "allwinner,sun9i-smp-sram"; + reg = <0x1000 0x8>; + }; + }; + + ehci0: usb@00a00000 { compatible = "allwinner,sun9i-a80-ehci", "generic-ehci"; reg = <0x00a00000 0x100>; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
