uart_set_options(9)

💖 uart_set_options(9) 💖

okay so this is a page from the Kernel API Manual (yes, the Kernel API Manual, we're fancy now) and it's all about uart_set_options — the little function that gets your serial console parameters set up. bestie, it's giving "backstage pass to the tty subsystem" and i'm obsessed. 🎀

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✨ NAME ✨

uart_set_options — setup the serial console parameters 🦋

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🌸 SYNOPSIS 🌸

int uart_set_options (struct uart_port *port , struct console *co , int
baud , int parity , int bits , int flow );

like, yes, that's a whole lotta ints. it's fine. we get through it together. 💜

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🌈 ARGUMENTS 🌈

• port — pointer to the serial port's uart_port structure, aka the main character of this whole operation 👑
• co — the console pointer, no cap
• baud — the baud rate ⭐
• parity — the parity character, and it's one of these three cuties: 'n' (none), 'o' (odd), 'e' (even)
• bits — number of data bits 🍓
• flow — flow control character — 'r' (rts)

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🔥 DESCRIPTION 🔥

Locking: the caller must hold console_list_lock in order to serialize early initialization of the serial-console lock. fr fr, this is not a suggestion, this is the assignment 😭 hold the lock or don't come to the function. 💅

lowkey important: that locking rule is the entire description. don't skip it, bestie. 🙈

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🧚 SEE ALSO 🧚

Kernel file ./drivers/tty/serial/serial_core.c — here's the whole friend group, all linked up 🫶

• uart_write_wakeup(9)
• uart_update_timeout(9)
• uart_get_baud_rate(9)
• uart_get_divisor(9)
• uart_get_lsr_info(9)
• uart_console_write(9)
• uart_parse_earlycon(9)
• uart_parse_options(9)
• uart_change_pm(9)
• uart_register_driver(9)
• uart_unregister_driver(9)
• serial_core_add_one_port(9)
• serial_core_remove_one_port(9)
• uart_match_port(9)
• uart_handle_dcd_change(9)
• uart_handle_cts_change(9)
• uart_insert_char(9)
• uart_try_toggle_sysrq(9)
• uart_get_rs485_mode(9)

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and that's the page, bestie! this one lives in ./drivers/tty/serial and it's stamped October 2026 — so like, remember it fondly, and go hold that console_list_lock. slay. 💅✨🎀