From 7bb7d31d9e454fc0b13cb0df44c2b4d953b4a152 Mon Sep 17 00:00:00 2001 From: Francesco Dolcini Date: Fri, 1 Dec 2023 20:57:32 +0100 Subject: [PATCH] arm64: defconfig: Increase SERIAL_8250_NR_UARTS Increase CONFIG_SERIAL_8250_NR_UARTS from 4 to 8, the current legacy value is not adequate for embedded systems that use SoCs where it's common to have a large number of serial ports. No need to change CONFIG_SERIAL_8250_RUNTIME_UARTS, see commit 9d86719f8769 ("serial: 8250: Allow using ports higher than SERIAL_8250_RUNTIME_UARTS"). The need to increase this value was noticed while working with Toradex Verdin AM62, this board has 4 serial UART instances available to the user plus an internal one that is connected to a Bluetooth module. Without this change the fifth UART connected to the BT module is not instantiated and BT is not working. Instead of increasing the number to the bare minimum (5) that would be required to solve this specific issue, we increase this to 8 which seems a more reasonable number to have in the defconfig and should cover more valid use cases. With this change the kernel image size increases by ~3.2kB. bloat-o-meter summary: add/remove: 1/1 grow/shrink: 7/0 up/down: 3220/-8 (3212) Cc: Tony Lindgren Reviewed-by: Tony Lindgren Signed-off-by: Francesco Dolcini Link: https://lore.kernel.org/r/20231201195732.4931-1-francesco@dolcini.it Signed-off-by: Nishanth Menon --- arch/arm64/configs/defconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index 329031271148..755c9de16fbb 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -449,6 +449,7 @@ CONFIG_SERIO_AMBAKMI=y CONFIG_LEGACY_PTY_COUNT=16 CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y +CONFIG_SERIAL_8250_NR_UARTS=8 CONFIG_SERIAL_8250_EXTENDED=y CONFIG_SERIAL_8250_SHARE_IRQ=y CONFIG_SERIAL_8250_BCM2835AUX=y -- 2.20.1