Building a Compact C Standard Library with Newlib on Bare Metal RISC-V

This article demonstrates building a compact C standard library using Newlib on a bare-metal RISC-V system. The author implements basic UART functions, passing them to Newlib to enable printf functionality. The process covers Newlib's concept, cross-compilation toolchain setup, UART driver, system calls, and linker script creation. The article concludes with running the application in QEMU and analyzing the debug log. This is a practical tutorial on embedded systems development, showing how to utilize the C standard library in resource-constrained environments.