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authorSebastian Huber <sebastian.huber@embedded-brains.de>2018-04-25 15:06:08 +0200
committerSebastian Huber <sebastian.huber@embedded-brains.de>2018-04-26 07:17:57 +0200
commiteb36d1198cdf9dc1e2f776ef6e1e38755f6d13c5 (patch)
tree14177ad7a58c06a3c537d1e55dae7bc369a1a4b9 /c/src/lib/libbsp/arm/raspberrypi
parentbsps: Remove unmaintained times files (diff)
downloadrtems-eb36d1198cdf9dc1e2f776ef6e1e38755f6d13c5.tar.bz2
bsps: Move documentation, etc. files to bsps
This patch is a part of the BSP source reorganization. Update #3285.
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-BSP for the Raspberry Pi ARM board
-This is a basic port that should work on either Model A or Model B.
-
-It currently supports the following devices:
- o Console using the PL011 UART0
- The console driver only works with polled mode right now,
- the interrupt code is there, but it does not work yet.
- The console driver is currently hardcoded at 115k 8N1
- o Clock uses the internal ARM timer
- The Raspberry Pi can be overclocked through the config.txt file, this
- would affect the duration of the clock tick.
- o Benchmark timer reads the lower 32 bit GPU timer register
-
-To run an RTEMS binary, it must be stripped and loaded on the SD card along with
-the following files:
- bootcode.bin
- config.txt
- loader.bin
- start.elf
- kernel.img ( the RTEMS binary, you can change the name in config.txt )
-
-These files can be obtained from a Linux installation image, or from here:
-https://github.com/raspberrypi/firmware
-
-I used an old 256MB SD card to boot RTEMS.
-Much more information about the SD card file and bootloader can be found here:
-http://elinux.org/RPi_Hub
-http://www.raspberrypi.org
-
-The linker script is set up for 128MB, so it can be used with a GPU/ARM split
-of 128/128.
-The bootloader that is used on the SD card determines the split of RAM between the
-ARM and the GPU. It might make sense to adjust the GPU/ARM memory split to give
-more memory to RTEMS, especially on a 512MB board.
-
-To do:
- It would be nice to get support in the BSP for the following:
- o SD card
- o USB and USB 10/100 network chip on Model B
- o SPI
- o GPIO
- o ARM MMU
- o Graphics console
- o Sound
-
-Credits and links:
-
- There is a wealth of code and information to reference on the raspberrypi.org bare metal forums:
- http://www.raspberrypi.org/phpBB3/viewforum.php?f=72
-
- I found information about how to program the timers, interrupts, and UART 0
- from the examples provided by:
-
- David Welch:
- https://github.com/dwelch67/raspberrypi
- The readme file at his github repository has valuable information about connecting a UART cable, JTAG etc.
-
- Steve Bate:
- http://www.stevebate.net/chibios-rpi/GettingStarted.html
- Steve provided a port of the Chibios RTOS to the raspberry Pi
-
- James Walmsley:
- http://www.raspberrypi.org/phpBB3/viewtopic.php?f=72&t=22423
- James ported FreeRTOS to the raspberry Pi.
-