| Message ID | 1515723685-19286-2-git-send-email-david@lechnology.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 01/11/2018 08:21 PM, David Lechner wrote: > 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> > --- Doh. I forgot to rebase, so this won't apply cleanly. V2 coming right up.
diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts index e4bbf48..1cb2ff1 100644 --- a/arch/arm/boot/dts/da850-lego-ev3.dts +++ b/arch/arm/boot/dts/da850-lego-ev3.dts @@ -212,6 +212,23 @@ compatible = "gpio-backlight"; gpios = <&gpio 44 GPIO_ACTIVE_HIGH>; }; + + /* 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>; + }; + }; }; &cpu {
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> --- arch/arm/boot/dts/da850-lego-ev3.dts | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)