【RPi】UART speed up

init_uart_baud initial UART baud rate. Default 115200

init_uart_clock initial UART clock. Default 3000000 (3 MHz)

・/boot/cmdline.txtを編集(削除)

#dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

・/etc/inittab ここをcomment out

T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

 

・ /boot/config.txtに追記

# Higher UART Speed
init_uart_baud=921600
init_uart_clock=14745600

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