Merge pull request #21 from WyliodrinEmbeddedIoT/microbit_v2

Microbit v2 serial bootloader

boards/microbit_v2-bootloader/Cargo.toml

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+[package]
+name = "microbit_v2-bootloader"
+version = "0.1.0"
+authors = ["Tock Project Developers <[email protected]>"]
+build = "build.rs"
+edition = "2018"
+
+[dependencies]
+cortexm4 = { git = "https://github.com/tock/tock", branch = "master" }
+capsules = { git = "https://github.com/tock/tock", branch = "master" }
+kernel = { git = "https://github.com/tock/tock", branch = "master" }
+nrf52 = { git = "https://github.com/tock/tock", branch = "master" }
+nrf52833 = { git = "https://github.com/tock/tock", branch = "master" }
+components = { git = "https://github.com/tock/tock", branch = "master" }
+
+# For Development
+# cortexm4 = { path = "../../../tock/arch/cortex-m4" }
+# capsules = { path = "../../../tock/capsules" }
+# kernel = { path = "../../../tock/kernel" }
+# nrf52 = { path = "../../../tock/chips/nrf52" }
+# nrf52833 = { path = "../../../tock/chips/nrf52833" }
+# components = { path = "../../../tock/boards/components" }
+
+bootloader = { path = "../../bootloader" }
+bootloader_nrf52 = { path = "../../chips/bootloader_nrf52" }
+bootloader_cortexm = { path = "../../arch/bootloader_cortexm" }
+
+
+[build-dependencies]
+bootloader_attributes = { path = "../../tools/bootloader_attributes" }
+
+[profile.dev]
+panic = "abort"
+lto = false
+opt-level = "z"
+debug = true
+
+[profile.release]
+panic = "abort"
+lto = true
+opt-level = "z"
+debug = true

boards/microbit_v2-bootloader/Makefile

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+# Makefile for building the Tock bootloader for nRF52 platforms using CDC-ACM
+# over USB.
+
+TOCK_ARCH=cortex-m4
+TARGET=thumbv7em-none-eabi
+PLATFORM=microbit_v2-bootloader
+
+include ../Common.mk
+
+TOCKLOADER=tockloader
+
+OPENOCD=openocd
+OPENOCD_OPTIONS=-f openocd.cfg
+
+# Upload the kernel over JTAG
+.PHONY: flash
+flash: $(TOCK_ROOT_DIRECTORY)target/$(TARGET)/release/$(PLATFORM).bin
+	$(OPENOCD) $(OPENOCD_OPTIONS) -c "program $<; verify_image $<; reset; shutdown;"
+
+.PHONY: flash
+flash-debug: $(TOCK_ROOT_DIRECTORY)target/$(TARGET)/debug/$(PLATFORM).bin
+	$(OPENOCD) $(OPENOCD_OPTIONS) -c "program $<; verify_image $<; reset; shutdown;"

boards/microbit_v2-bootloader/README.md

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+BBC:MicroBit v2 Tock Bootloader
+===================
+
+This is the implementation of the Tock bootloader for the BBC:MicroBit v2
+board. The bootloader runs using the Debugger UART.
+
+Compiling
+---------
+
+To compile the bootloader, simply run the `make` command.
+
+```
+make
+```
+
+Flashing
+--------
+
+OpenOCD is needed to flash the bootloader. Running `make flash` will compile it and flash it.
+
+```
+make flash
+```
+
+Entering
+--------
+
+Entering the bootloader is done by holding Button A during reset.

boards/microbit_v2-bootloader/build.rs

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+extern crate bootloader_attributes;
+
+fn main() {
+    println!("cargo:rerun-if-changed=layout.ld");
+    println!("cargo:rerun-if-changed=../kernel_layout.ld");
+
+    let mut f = bootloader_attributes::get_file();
+    bootloader_attributes::write_flags(&mut f, "1.1.1", 0x8000);
+    bootloader_attributes::write_attribute(&mut f, "board", "microbit_v2");
+    bootloader_attributes::write_attribute(&mut f, "arch", "cortex-m4");
+    bootloader_attributes::write_attribute(&mut f, "appaddr", "0x40000");
+}

boards/microbit_v2-bootloader/layout.ld

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+MEMORY
+{
+  rom (rx)  : ORIGIN = 0x00000000, LENGTH = 32K
+  prog (rx) : ORIGIN = 0x00008000, LENGTH = 480K
+  ram (rwx) : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+MPU_MIN_ALIGN = 8K;
+PAGE_SIZE = 4K;
+
+INCLUDE ../kernel_layout.ld

boards/microbit_v2-bootloader/openocd.cfg

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+source [find interface/cmsis-dap.cfg]
+transport select swd
+source [find target/nrf52.cfg]
+
+set WORKAREASIZE 0x40000
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $WORKAREASIZE -work-area-backup 0
+
+flash bank $_CHIPNAME.flash nrf51 0x00000000 0 1 1 $_TARGETNAME
+flash bank $_CHIPNAME.uicr nrf51 0x10001000 0 1 1 $_TARGETNAME
+