ADD: Serial TTY driver and TTY chardev registration#231
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New drivers/tty/serial_tty.zig: - Inlined UART 16550 I/O (probe, activate, read, write) - TtyDriver backend for serial ports (COM1-COM4) - IRQ-driven receive via drain_uart() - set_termios for baud rate / line parameter changes.. New drivers/tty/tty_cdev.zig: - Register /dev/tty0..4 (VGA consoles, major 4, minor 0+) - Register /dev/ttyS0..3 (serial ports, major 4, minor 64+) Deleted drivers/serial_port/serial.zig (replaced by serial_tty). Rewired CI shell and logger to use serial_tty instead of the deleted Serial driver.
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New drivers/tty/serial_tty.zig:
New drivers/tty/tty_cdev.zig:
Deleted drivers/serial_port/serial.zig (replaced by serial_tty).
Rewired CI shell and logger to use serial_tty instead of the deleted Serial driver.
Depends-on: #230