From b4f35870a9b90058970caa5b71be26425d06454b Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Thu, 19 Oct 2023 11:46:43 +0200 Subject: [PATCH] sh: bios: Revive earlyprintk support [ Upstream commit 553f7ac78fbb41b2c93ab9b9d78e42274d27daa9 ] The SuperH BIOS earlyprintk code is protected by CONFIG_EARLY_PRINTK. However, when this protection was added, it was missed that SuperH no longer defines an EARLY_PRINTK config symbol since commit e76fe57447e88916 ("sh: Remove old early serial console code V2"), so BIOS earlyprintk can no longer be used. Fix this by reviving the EARLY_PRINTK config symbol. Fixes: d0380e6c3c0f6edb ("early_printk: consolidate random copies of identical code") Signed-off-by: Geert Uytterhoeven Reviewed-by: John Paul Adrian Glaubitz Link: https://lore.kernel.org/r/c40972dfec3dcc6719808d5df388857360262878.1697708489.git.geert+renesas@glider.be Signed-off-by: John Paul Adrian Glaubitz Signed-off-by: Sasha Levin --- arch/sh/Kconfig.debug | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug index c449e7c1b20f..8bcd6c1431a9 100644 --- a/arch/sh/Kconfig.debug +++ b/arch/sh/Kconfig.debug @@ -22,6 +22,17 @@ config STACK_DEBUG every function call and will therefore incur a major performance hit. Most users should say N. +config EARLY_PRINTK + bool "Early printk" + depends on SH_STANDARD_BIOS + help + Say Y here to redirect kernel printk messages to the serial port + used by the SH-IPL bootloader, starting very early in the boot + process and ending when the kernel's serial console is initialised. + This option is only useful while porting the kernel to a new machine, + when the kernel may crash or hang before the serial console is + initialised. If unsure, say N. + config 4KSTACKS bool "Use 4Kb for kernel stacks instead of 8Kb" depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB