| Message ID | 1515724191-30499-2-git-send-email-david@lechnology.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Friday 12 January 2018 07:59 AM, 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> Added to v4.17/dt Thanks, Sekhar
diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts index 81942ae..2e85080 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 {
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(+)