[pico-sdk/rp2350] Added README.md, .gdbinit

Author: danielinux

IDE/pico-sdk/rp2350/README.md

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+## wolfBoot port for rp2350 (Raspberry pi pico 2)
+
+### Requirements 
+
+#### External debugger
+
+As the two images (bootloader + application) are stored in different areas in
+the flash memory, a SWD connector is required to upload the binary images into
+the flash, as opposed to the default bootloader, allowing to upload non-signed
+applications into a storage device
+
+#### PicoSDK
+
+Clone the repository from raspberrypi's github: 
+
+```
+git clone https://github.com/raspberrypi/pico-sdk.git
+```
+
+Export the `PICO_SDK_PATH` environment variable to point to the pico-sdk directory:
+
+```
+export PICO_SDK_PATH=/path/to/pico-sdk
+```
+
+### Configuring wolfBoot to build with pico-sdk
+
+From wolfBoot root directory, copy the example configuration:
+
+```
+cp config/examples/rp2350.config .config
+```
+
+By default, the config file indicates the following partition layout:
+
+```
+wolfBoot partition: 256 KB, at address 0x10000000 to 0x1003FFFF
+Boot partition:     768 KB, at address 0x10040000 to 0x1007FFFF
+Update partition:   768 KB, at address 0x10100000 to 0x1013FFFF
+Swap space:           4 KB, at address 0x101C0000 to 0x101C0FFF
+Unused flash space: 252 KB, at address 0x101C1000 to 0x101FFFFF
+```
+
+You can now edit the .config file to change partition sizes/offsets, algorithms,
+add/remove features, etc.
+
+When the configuration is complete, run `make`. This will:
+
+- Build the key tools (keygen & sign):
+- Generate the configuration header `target.h`
+- Generate a new keypair (only once), and place the public key in the
+keystore
+
+The environment has now been prepared to build and flash the two images
+(wolfBoot + test application).
+
+### Building and uploading wolfBoot.bin
+
+After preparing the configuration and creating the keypair,
+return to this directory and run:
+
+```
+cd wolfboot
+./build-wolfboot.sh
+```
+
+The script above will compile wolfboot as rp2350 second-stage bootloader.
+This version of wolfboot incorporates the `.boot2` sequence needed to enable
+the QSPI device, provided by the pico-sdk and always embedded in all
+applications.
+
+wolfboot.bin contains the bootloader, configured as follows:
+
+### Building and uploading the application
+
+```
+cd test-app
+./build-signed-app.sh
+```
+The script above will compile the test application and sign it with the
+wolfBoot private key. The signed application is then uploaded to the boot
+partition of the flash memory, at address 0x10040000.
+
+The linker script included is modified to change the application entry point
+from 0x10000000 to 0x10040400, which is the start of the application code,
+taking into account the wolfBoot header size.
+
+
+### Testing the application
+
+The application is a simple blinky example, which toggles the LED on the board
+every 500ms.
+
+If the above steps are successful, the LED on the board should start blinking.
+

IDE/pico-sdk/rp2350/wolfboot/.gdbinit

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+tar rem:3333
+file build/wolfboot.elf
+add-symbol-file ../test-app/build/blink.elf
+foc c
+