The Raspberry Pi startup stub files for multi-core BCM27XX processors make the secondary CPUs spin until the corresponding mailbox is written. These stubs are loaded at physical address 0x00000xxx (as seen by the ARMs), but this page will be reused by the kernel unless it is explicitly reserved, causing the waiting cores to execute random code. Use the /memreserve/ Device Tree directive to mark the first page as off-limits to the kernel. See: https://github.com/raspberrypi/linux/issues/1989 Signed-off-by: Phil Elwell <phil@xxxxxxxxxxxxxxx> --- Changes in V2: - Rebase against linux-next - Drop downstream-only patch arch/arm/boot/dts/bcm283x.dtsi | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi index a3106aa..6d12c3e8 100644 --- a/arch/arm/boot/dts/bcm283x.dtsi +++ b/arch/arm/boot/dts/bcm283x.dtsi @@ -3,6 +3,8 @@ #include <dt-bindings/clock/bcm2835-aux.h> #include <dt-bindings/gpio/gpio.h> +/memreserve/ 0x00000000 0x00001000; + /* This include file covers the common peripherals and configuration between * bcm2835 and bcm2836 implementations, leaving the CPU configuration to * bcm2835.dtsi and bcm2836.dtsi. -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
