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rust-raspberrypi-OS-tutorials/X1_JTAG_boot
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Andre Richter 2432c0d283
Revert to assembly boot code 
It is too risky to rely on the compiler to not insert any operations using the
stack.

Having a stack-setting call in Rust using the cortex-a crate as the first action
in a Rust-only _start() function does not work if you're subsequently using the
stack, because the compiler often inserts the operations to make room on the
stack to prepare a function call BEFORE the call to set the stack, which crashes
the boot process.

Hence, keep on using a small piece of assembly boot code throughout.
 		3 years ago
..
.vscode Run of prettier over whole repo 4 years ago
src Revert to assembly boot code 3 years ago
Cargo.lock Bump dependencies 3 years ago
Cargo.toml Add color and verbosity to Makefile 3 years ago
Makefile Overhaul linker script 3 years ago
README.md Add code for tutorial 09 5 years ago
build.rs Add color and verbosity to Makefile 3 years ago
jtag_boot_rpi3.img Revert to assembly boot code 3 years ago
jtag_boot_rpi4.img Revert to assembly boot code 3 years ago
update.sh X1: Fix deletion of non-existent file 4 years ago

README.md

Xtra 1 - JTAG boot

Not much is happening here. The binary just patiently waits for a JTAG debugger to connect.