Rust workspace for Raspberry Pi 3 feL4/seL4 things

Rust embedded things running on the seL4 microkernel for the Raspberry Pi 3 platform.

NOTE: most of these are a WIP and in an experimental/hacky state

Some of the projects/libs:

• bcm2837/: BCM2837 device crate
• bcm2837-hal/: embedded-hal traits for the BCM2837
• display/: Double-buffered, DMA backed graphics display library
• clock-display/: Example project, render a simple clock
• dma-example/: Example project, DMA transfer to GPU memory
• spi-enc28j60-eth-example/: Example Ethernet driver

Dependencies

• cargo-fel4
• cargo-fel4 with my rpi3 changes

U-boot

Using 64 bit U-boot:

U-Boot> version
U-Boot 2018.11-g208ecba (Nov 14 2018 - 13:17:50 -0800)

aarch64-linux-gnu-gcc (Linaro GCC 7.3-2018.05) 7.3.1 20180425 [linaro-7.3-2018.05 revision d29120a424ec
fbc167ef90065c0eeb7f91977701]
GNU ld (Linaro_Binutils-2018.05) 2.28.2.20170706

Environment:

setenv imgname feL4img
setenv loadaddr 0x20000000

setenv bootfeL4 'tftp ${loadaddr} ${serverip}:${imgname}; dcache flush; dcache off; go ${loadaddr}'

SD Card

Files:

/card
├── bootcode.bin
├── config.txt
├── fixup.dat
├── start.elf
├── u-boot.bin
└── uboot.env

Contents of config.txt:

enable_uart=1
arm_64bit=1
dtoverlay=pi3-disable-bt
kernel=u-boot.bin

Simulating

TODO - need to add custom simulation configs to cargo-fel4 so it's easier to enble graphics/etc

By default, the underlying seL4 simulate script supplies QEMU with --no-graphic.

If you want to enable graphics (to see the GPU/framebuffer examples), add the extra arg --graphic=.