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d33f4f8565
Reduce spi-max-frequency for Xiaomi MI Router 4AG model
Xiaomi MI Router 4AG MTD uses two flash chips (no specific on router versions when produced from factory) - GD25Q128C and W25Q128BV.
These flash chips are capable of high frequency, but due to poor board design or manufacture process.
We are seeing the following errors in the linux kernel bootup:
`spi-nor spi0.0: unrecognized JEDEC id bytes: cc 60 1c cc 60 1c
spi-nor: probe of spi0.0 failed with error -2`
This causes the partitions not to be detected
`VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6`
Then creates a bootloop and a bricked router.
The solution to limit this race condition is to reduce the frequency from 80 mhz to 50 mhz.
Signed-off-by: David Bentham <db260179@gmail.com>
(cherry picked from commit 17e690017d)
163 lines
2.5 KiB
Plaintext
163 lines
2.5 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
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#include "mt7621.dtsi"
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/input/input.h>
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/ {
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aliases {
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led-boot = &led_status_yellow;
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led-failsafe = &led_status_yellow;
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led-running = &led_status_blue;
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led-upgrade = &led_status_yellow;
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label-mac-device = &wan;
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};
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chosen {
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bootargs = "console=ttyS0,115200n8";
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};
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leds {
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compatible = "gpio-leds";
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led_status_blue: status_blue {
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label = "blue:status";
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gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
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};
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led_status_yellow: status_yellow {
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label = "yellow:status";
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gpios = <&gpio 10 GPIO_ACTIVE_LOW>;
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};
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};
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keys {
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compatible = "gpio-keys";
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reset {
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label = "reset";
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gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
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linux,code = <KEY_RESTART>;
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};
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};
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};
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&spi0 {
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status = "okay";
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flash@0 {
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compatible = "jedec,spi-nor";
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reg = <0>;
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spi-max-frequency = <50000000>;
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m25p,fast-read;
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partitions {
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compatible = "fixed-partitions";
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#address-cells = <1>;
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#size-cells = <1>;
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partition@0 {
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label = "u-boot";
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reg = <0x0 0x30000>;
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read-only;
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};
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partition@30000 {
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label = "u-boot-env";
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reg = <0x30000 0x10000>;
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read-only;
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};
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partition@40000 {
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label = "Bdata";
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reg = <0x40000 0x10000>;
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read-only;
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};
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factory: partition@50000 {
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label = "factory";
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reg = <0x50000 0x10000>;
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read-only;
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};
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partition@60000 {
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label = "crash";
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reg = <0x60000 0x10000>;
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read-only;
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};
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partition@70000 {
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label = "cfg_bak";
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reg = <0x70000 0x10000>;
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read-only;
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};
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partition@80000 {
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label = "overlay";
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reg = <0x80000 0x100000>;
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read-only;
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};
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firmware: partition@180000 {
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compatible = "denx,uimage";
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label = "firmware";
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reg = <0x180000 0xe80000>;
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};
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};
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};
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};
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&pcie {
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status = "okay";
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};
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&pcie0 {
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wifi@0,0 {
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compatible = "pci14c3,7662";
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reg = <0x0000 0 0 0 0>;
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mediatek,mtd-eeprom = <&factory 0x8000>;
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ieee80211-freq-limit = <5000000 6000000>;
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};
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};
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&pcie1 {
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wifi@0,0 {
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compatible = "pci14c3,7603";
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reg = <0x0000 0 0 0 0>;
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mediatek,mtd-eeprom = <&factory 0x0000>;
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ieee80211-freq-limit = <2400000 2500000>;
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};
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};
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&gmac0 {
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mtd-mac-address = <&factory 0xe000>;
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};
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&switch0 {
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ports {
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port@2 {
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status = "okay";
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label = "lan2";
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};
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port@3 {
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status = "okay";
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label = "lan1";
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};
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wan: port@4 {
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status = "okay";
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label = "wan";
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mtd-mac-address = <&factory 0xe006>;
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};
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};
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};
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&state_default {
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gpio {
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groups = "jtag", "uart2", "uart3", "wdt";
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function = "gpio";
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};
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};
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