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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a252ccd3d2
The first 128 MiB of RAM can be accessed using an alias at address 0x0. In theory we could access whole RAM using 0x80000000 - 0xbfffffff range (up to 1 GiB) but it doesn't seem to work on Northstar. For some reason (hardware setup left by the bootloader maybe?) 0x80000000 - 0x87ffffff range can't be used. I reproduced this problem on: 1) Buffalo WZR-600DHP2 (BCM47081) 2) Netgear R6250 (BCM4708) 3) D-Link DIR-885L (BCM47094) So it seems we're forced to access first 128 MiB using alias at 0x0 and the rest using real base address + 128 MiB offset which is 0x88000000. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Acked-by: Jon Mason <jon.mason@broadcom.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
68 lines
1.2 KiB
Plaintext
68 lines
1.2 KiB
Plaintext
/*
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* Broadcom BCM470X / BCM5301X ARM platform code.
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* DTS for Asus RT-AC87U
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*
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* Copyright (C) 2015 Rafał Miłecki <zajec5@gmail.com>
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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/dts-v1/;
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#include "bcm4709.dtsi"
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#include "bcm5301x-nand-cs0-bch8.dtsi"
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/ {
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compatible = "asus,rt-ac87u", "brcm,bcm4709", "brcm,bcm4708";
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model = "Asus RT-AC87U";
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chosen {
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bootargs = "console=ttyS0,115200";
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};
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memory {
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reg = <0x00000000 0x08000000
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0x88000000 0x08000000>;
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};
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leds {
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compatible = "gpio-leds";
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wps {
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label = "bcm53xx:blue:wps";
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gpios = <&chipcommon 1 GPIO_ACTIVE_LOW>;
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linux,default-trigger = "default-off";
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};
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power {
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label = "bcm53xx:blue:power";
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gpios = <&chipcommon 3 GPIO_ACTIVE_LOW>;
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linux,default-trigger = "default-on";
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};
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wan {
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label = "bcm53xx:red:wan";
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gpios = <&chipcommon 5 GPIO_ACTIVE_LOW>;
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linux,default-trigger = "default-off";
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};
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};
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gpio-keys {
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compatible = "gpio-keys";
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#address-cells = <1>;
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#size-cells = <0>;
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wps {
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label = "WPS";
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linux,code = <KEY_WPS_BUTTON>;
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gpios = <&chipcommon 2 GPIO_ACTIVE_LOW>;
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};
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restart {
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label = "Reset";
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linux,code = <KEY_RESTART>;
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gpios = <&chipcommon 11 GPIO_ACTIVE_LOW>;
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};
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};
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};
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