Date: Thu, 13 Feb 2020 21:51:24 +0100 From: =?utf-8?Q?Klaus_K=C3=BCchemann?= <maciphone2@googlemail.com> To: Mark Millard <marklmi@yahoo.com>, freebsd-arm@freebsd.org Subject: Re: A investigative hack that makes (for example) head -r356529 boot and operate normally an RPi4B (finally!): protect all armstub8-gic.bin's loaded content from replacement by the kernel Message-ID: <256E923D-AD9A-4DB3-84F7-7BDD55E75691@googlemail.com> In-Reply-To: <B64C6065-D804-4D6F-8660-F8DBB9946DEB@yahoo.com> References: <7E7605DC-021D-448A-8459-8EC26BA9836D@yahoo.com> <E1j2EmR-000Mwm-ID@iz-wera-new.HS-Karlsruhe.DE> <CACNAnaHVYeuoK=4f7XzokpAVjcqd6ovD58-0LdP_vPGjiXQgdw@mail.gmail.com> <E1j2FRX-000MyR-1O@iz-wera-new.HS-Karlsruhe.DE> <E1j2G3j-000Mzo-Dw@iz-wera-new.HS-Karlsruhe.DE> <CACNAnaHUwu0GmqW9QZRhS2sMK0HpsjdYRz3YouL5FMBdWBCW-Q@mail.gmail.com> <B64C6065-D804-4D6F-8660-F8DBB9946DEB@yahoo.com>
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> Am 13.02.2020 um 17:50 schrieb Mark Millard via freebsd-arm <freebsd-arm@freebsd.org>:
>
> There is the cpu-rlease-addr information that seems
> to refer to some 1st memory page content:
>
> cpus {
> #address-cells = <0x00000001>;
> #size-cells = <0x00000000>;
> enable-method = "brcm,bcm2836-smp";
> phandle = <0x000000be>;
> cpu@0 {
> device_type = "cpu";
> compatible = "arm,cortex-a72";
> reg = <0x00000000>;
> enable-method = "spin-table";
> cpu-release-addr = <0x00000000 0x000000d8>;
> phandle = <0x0000001d>;
> };
> cpu@1 {
> device_type = "cpu";
> compatible = "arm,cortex-a72";
> reg = <0x00000001>;
> enable-method = "spin-table";
> cpu-release-addr = <0x00000000 0x000000e0>;
> phandle = <0x0000001e>;
> };
> cpu@2 {
> device_type = "cpu";
> compatible = "arm,cortex-a72";
> reg = <0x00000002>;
> enable-method = "spin-table";
> cpu-release-addr = <0x00000000 0x000000e8>;
> phandle = <0x0000001f>;
> };
> cpu@3 {
> device_type = "cpu";
> compatible = "arm,cortex-a72";
> reg = <0x00000003>;
> enable-method = "spin-table";
> cpu-release-addr = <0x00000000 0x000000f0>;
> phandle = <0x00000020>;
> };
> };
>
>
Although I didn’t have yet time to step into debugging just a sidenote :
, the above table shown from you is for bcm2836
Where for bcm-2711 dtsi :
cpu0: cpu@0 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <0>;
enable-method = "spin-table";
cpu-release-addr = <0x0 0x000000d8>;
};
cpu1: cpu@1 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <1>;
enable-method = "spin-table";
cpu-release-addr = <0x0 0x000000e0>;
};
cpu2: cpu@2 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <2>;
enable-method = "spin-table";
cpu-release-addr = <0x0 0x000000e8>;
};
cpu3: cpu@3 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <3>;
enable-method = "spin-table";
cpu-release-addr = <0x0 0x000000f0>;
};
};
Regards
Klaus
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