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ARM: dts: da850-lego-ev3: Add node for reboot modes

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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>
This commit is contained in:
David Lechner 2018-01-11 20:29:50 -06:00 committed by Sekhar Nori
parent 7928b2cbe5
commit 7d7eff8f1a
1 changed files with 17 additions and 0 deletions
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17
arch/arm/boot/dts/da850-lego-ev3.dts
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@ -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 {