On 12/14/2016 10:52 AM, Neil Armstrong wrote:

Hi Heinrich,

Thanks for testing and for the report,
we are still struggling into finding what are these zones and how to label them correctly.

We need to identify the zones on all boards, the patch I provided works on a non-odroid-c2 and gxm and gxl boards.

Neil

Hello Neil,

the configuration below works for me on the Hardkernel Odroid C2.

ramoops is needed for CONFIG_PSTORE_RAM.
Debian Stretch has CONFIG_PSTORE_RAM=m. Same is true for Fedora.
I have chosen the address arbitrarily. To accommodate 512 MB boards we
would have to put it below 0x20000000.
The size parameters are the same as in hisilicon/hi6220-hikey.dts and
qcom-apq8064-asus-nexus7-flo.dts.

linux,cma is used for contiguous memory assignment. I have taken the
align parameter from arm-src-kernel-2016-08-18-26e194264c.tar.gz
provided by Amlogic at
http://openlinux.amlogic.com:8000/download/ARM/kernel/ .
See Documentation/DMA-API.txt for the usage of align.
They use the same value 0x400000 for all GXBB boards.
So we want to put this zone into meson-gxbb.dtsi.

secmon is used by drivers/firmware/meson/meson_sm.c.
Amlogic uses the same address range for all 64bit boards.

	memory at 0 {
		device_type = "memory";
		linux,usable-memory = <0x0 0x1000000 0x0 0x7f000000>;
	};

	reserved-memory {
		#address-cells = <0x2>;
		#size-cells = <0x2>;
		ranges;

		ramoops at 0x23f00000 {
			compatible = "ramoops";
			reg = <0x0 0x23f00000 0x0 0x100000>;
			record-size = <0x20000>;
			console-size = <0x20000>;
			ftrace-size = <0x20000>;
		};

		secmon: secmon {
			compatible = "amlogic, aml_secmon_memory";
			reg = <0x0 0x10000000 0x0 0x200000>;
			no-map;
		};

		linux,cma {
			compatible = "shared-dma-pool";
			reusable;
			size = <0x0 0xbc00000>;
			alignment = <0x0 0x400000>;
			linux,cma-default;
		};
	};

Best regards

Heinrich Schuchardt