serial: ns16550: Add RX interrupt buffer support
Pasting longer lines into the U-Boot console prompt sometimes leads to characters missing. One problem here is the small 16-byte FIFO of the legacy NS16550 UART, e.g. on x86 platforms. This patch now introduces a Kconfig option to enable RX interrupt buffer support for NS16550 style UARTs. With this option enabled, I was able paste really long lines into the U-Boot console, without any characters missing. Signed-off-by: NStefan Roese <sr@denx.de> Reviewed-by: NSimon Glass <sjg@chromium.org> Cc: Bin Meng <bmeng.cn@gmail.com> [trini: Guard ns16550_serial_remove with CONFIG_IS_ENABLED(SERIAL_PRESENT) to match struct assignment] Signed-off-by: NTom Rini <trini@konsulko.com>
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