mirror of
https://github.com/clockworkpi/PicoCalc.git
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88 lines
2.3 KiB
Markdown
88 lines
2.3 KiB
Markdown
# PicoCalc multi booter
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Here is a bootloader for PicoCalc combined slightly modified [PicoMite](https://github.com/madcock/PicoMiteAllVersions) and [SD boot](https://github.com/adwuard/Picocalc_SD_Boot)
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- Pico1
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- No sdcard inserted ,PicoMite will show up.
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- Sdcard inserted, SD boot menu will show up, load third pico app bin to run at FLASH TARGET OFFSET 2048k-940k
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## How to compile
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```
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export PICO_SDK_PATH=/where/picosdk/is
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mkdir build
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cd build
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cmake ..
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make
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```
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## How to run
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Just copy **combined.uf2** into PicoCalc
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## PicoMite
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configuration.h
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```
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#define FLASH_TARGET_OFFSET (920 * 1024)
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```
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## sd_boot
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config.h
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```
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#define SD_BOOT_FLASH_OFFSET (940 * 1024)
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```
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### SD Card Application Build and Deployment
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**Important Note:**
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```
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Applications intended for SD card boot "MUST REBUILD" using a custom linker script to accommodate the program's offset(940k) address.
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Applications intended for SD card boot is in **bin** format, not uf2.
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```
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---
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This section explains how to build and deploy applications on an SD card. Below is a simple example of a CMakeLists.txt for an application.
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#### Step 1 Copy Custom Link Script
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Copy `memmap_sdcard_app.ld` to your project repository.
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#### Step 2 Add Custom Link Script to CMakeList.txt
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In the project for multi boot, add custom link script to CMakeList.txt,usually at bottom.
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We also need to use `pico_add_extra_outputs` to sure that there will .bin file generated.
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```
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...
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pico_add_extra_outputs(${CMAKE_PROJECT_NAME})
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...
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function(enable_sdcard_app target)
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#pico_set_linker_script(${target} ${CMAKE_SOURCE_DIR}/memmap_sdcard_app.ld)
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if(${PICO_PLATFORM} STREQUAL "rp2040")
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pico_set_linker_script(${CMAKE_PROJECT_NAME} ${CMAKE_SOURCE_DIR}/memmap_default_rp2040.ld)
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elseif(${PICO_PLATFORM} MATCHES "rp2350")
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pico_set_linker_script(${CMAKE_PROJECT_NAME} ${CMAKE_SOURCE_DIR}/memmap_default_rp2350.ld)
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endif()
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endfunction()
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enable_sdcard_app(${CMAKE_PROJECT_NAME})
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```
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#### Build and Deployment Process
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1. Build the project using the above CMakeLists.txt.
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```bash
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mkdir build;
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cd build
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export PICO_SDK_PATH=/path/to/pico-sdk
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cmake ..
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make
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```
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#### Step 3 Your Custom Application Is Ready For SD Card Boot
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Once the build is complete, copy the generated `.bin` file to the `/sd` directory of the SD card.
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