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Diffstat (limited to 'user/bsps/arm/raspberrypi.rst')
| -rw-r--r-- | user/bsps/arm/raspberrypi.rst | 61 |
1 files changed, 50 insertions, 11 deletions
diff --git a/user/bsps/arm/raspberrypi.rst b/user/bsps/arm/raspberrypi.rst index 72889a5..8f40e92 100644 --- a/user/bsps/arm/raspberrypi.rst +++ b/user/bsps/arm/raspberrypi.rst @@ -5,13 +5,14 @@ raspberrypi =========== -This BSP supports `Raspberry Pi 1` and `Raspberry Pi 2` currently. -The support for `Raspberry Pi 3` is work under progress. +The 'raspberrypi' BSP supports the single core models (Zero, Zero W, A+, B+), +and the 'raspberrypi2' BSP supports the Raspberry Pi 2, Raspberry Pi 3 A+, and Raspberry Pi 3. +The Raspberry Pi 4 is not supported currently. The default bootloader on the Raspberry Pi which is used to boot Raspbian or other OS can be also used to boot RTEMS. U-boot can also be used. Setup SD card ----------------- +------------- The Raspberry Pis have an unconventional booting mechanism. The GPU boots first, initializes itself, runs the bootloader and starts the CPU. @@ -19,11 +20,13 @@ The bootloader looks for a kernel image, by default the kernel images must have a name of the form ``kernel*.img`` but this can be changed by adding `kernel=<img_name>` to ``config.txt``. -You must provide the required files for the GPU to proceed. These files -can be downloaded from -`the Raspberry Pi Firmware Repository <https://github.com/raspberrypi/firmware/tree/master/boot>`_. -You can remove the ``kernel*.img`` files if you want too, but don't touch -the other files. +You must provide the required firmware files on the SD card for the GPU to +proceed, and thereby to boot RTEMS. The BSP currently boots up with an older +version of the official firmware. These files can be downloaded from `the +Raspberry Pi Firmware Repository +<https://github.com/raspberrypi/firmware/tree/1.20200601/boot>`_. You can +remove the ``kernel*.img`` files if you want to, but don't touch the other +files. Copy these files in to a SD card with FAT filesystem. @@ -38,7 +41,7 @@ To create the kernel image: .. code-block:: none - $ arm-rtems5-objcopy -Obinary hello.exe kernel.img + $ xsarm-rtems@rtems-ver-major@-objcopy -Obinary hello.exe kernel.img Copy the kernel image to the SD card. @@ -46,10 +49,46 @@ Make sure you have these lines below, in your ``config.txt``. .. code-block:: none - enable-uart=1 + dtoverlay=disable-bt kernel_address=0x200000 kernel=kernel.img +SPI Driver +---------- + +SPI drivers are registered by the ``rpi_spi_init(bool bidirectional_mode)`` function. + +.. code-block:: none + + #include <assert.h> + #include <bsp.h> + + void spi_init(void) + { + int rv; + + rv = rpi_spi_init(false); + assert(rv == 0); + } + +I2C Driver +---------- + +I2C drivers are registered by the ``rpi_setup_i2c_bus()`` function. + +.. code-block:: none + + #include <assert.h> + #include <bsp.h> + + void i2c_init(void) + { + int rv; + + rv = rpi_setup_i2c_bus(); + assert(rv == 0); + } + Testing using QEMU ------------------ @@ -93,7 +132,7 @@ In a new terminal, run GDB using .. code-block:: none - $ arm-rtems5-gdb hello.exe + $ arm-rtems@rtems-ver-major@-gdb hello.exe This will open GDB and will load the symbol table from hello.exe. Issue the following commands in the GDB prompt. |