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| author | David Lechner <david@lechnology.com> | 2018-01-12 03:29:50 +0100 |
|---|---|---|
| committer | Sekhar Nori <nsekhar@ti.com> | 2018-02-23 12:47:02 +0100 |
| commit | 7d7eff8f1afcf33bd643786364f4e0bda08877fe (patch) | |
| tree | 56d47c565eca37c63d070d595fdd237b41d52e88 /arch/arm/boot/dts/da850-lego-ev3.dts | |
| parent | Linux 4.16-rc1 (diff) | |
| download | linux-7d7eff8f1afcf33bd643786364f4e0bda08877fe.tar.xz linux-7d7eff8f1afcf33bd643786364f4e0bda08877fe.zip | |
ARM: dts: da850-lego-ev3: Add node for reboot modes
This adds a new node for reboot modes on LEGO MINDSTORMS EV3. The EV3's
bootloader looks for a magic number in the ARM local RAM and if found,
it will boot into a special firmware update mode where the flash memory
can be written via USB.
This has been testing working using the command:
# systemctl reboot loader
Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Diffstat (limited to 'arch/arm/boot/dts/da850-lego-ev3.dts')
| -rw-r--r-- | arch/arm/boot/dts/da850-lego-ev3.dts | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts index 81942ae83e1f..2e8508042e39 100644 --- a/arch/arm/boot/dts/da850-lego-ev3.dts +++ b/arch/arm/boot/dts/da850-lego-ev3.dts @@ -184,6 +184,23 @@ io-channel-names = "voltage", "current"; rechargeable-gpios = <&gpio 136 GPIO_ACTIVE_LOW>; }; + + /* ARM local RAM */ + memory@ffff0000 { + compatible = "syscon", "simple-mfd"; + reg = <0xffff0000 0x2000>; /* 8k */ + + /* + * The I2C bootloader looks for this magic value to either + * boot normally or boot into a firmware update mode. + */ + reboot-mode { + compatible = "syscon-reboot-mode"; + offset = <0x1ffc>; + mode-normal = <0x00000000>; + mode-loader = <0x5555aaaa>; + }; + }; }; &pmx_core { |