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readme: add deployer documentation

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Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
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Eric Callahan 2022-08-25 16:40:01 -04:00
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@ -26,6 +26,8 @@ make
The menuconfig will present the following options:
- `Microcontroller Architecture`: Choose between lpc176x and ST
- `Processor model`: Options depend on the chosen architecture
- `Build CanBoot deployment application`: See the [deployer](#canboot-deployer)
section below
- `Disable SWD at startup`: This is an option for GigaDevice STM32F103
clones. Note that this is untested for the bootloader, GigaDevice clones
may not work as expected.
@ -128,6 +130,26 @@ The `interface` option defaults to `can0` if omitted. The `firmware` option
defaults to `~/klipper/out/klipper.bin`. The `uuid` must be specified unless
the user is running a query with `-q`.
## CanBoot Deployer
The CanBoot deployer allows a user to overwrite their existing bootloader
with CanBoot, allowing modification and updates without a programmer. It
is *strongly* recommended that an alternate recovery (programmer, DFU, etc)
method is available in the event that something goes wrong during deployment.
If coming from a stock bootloader it is also recommended that the user create
a backup before proceeding.
To build the deployer set the `Build CanBoot deployment application` option
in the menuconfig to your existing bootloader offset. The additional settings
apply to the CanBoot binary, configure them just as you would without the
deployer. Save your settings and build with `make`.
This will result in an additional binary in the `out` folder, `deployer.bin`.
Flash `deployer.bin` with your existing bootloader (SD Card, HID, an older
version of CanBoot, etc). Once complete, the deployer should reset the
device and enter CanBoot. Now you are ready to use CanBoot to flash an
application, such as Klipper.
## Notes
- It is recommended to USB CAN device flashed with
[candlelight](https://github.com/candle-usb/candleLight_fw), such as a