From dbb983145312efba5f7928af1b180a0d83423150 Mon Sep 17 00:00:00 2001 From: Alban Bedel Date: Thu, 10 Dec 2015 10:57:21 +0100 Subject: MIPS: zboot: Add support for serial debug using the PROM As most platforms implement the PROM serial interface prom_putchar() add a simple bridge to allow re-using this code for zboot. Signed-off-by: Alban Bedel Cc: Alex Smith Cc: Andrew Bresticker Cc: Wu Zhangjin Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/11811/ Signed-off-by: Ralf Baechle --- arch/mips/Kconfig | 4 ++++ arch/mips/boot/compressed/Makefile | 1 + arch/mips/boot/compressed/uart-prom.c | 7 +++++++ 3 files changed, 12 insertions(+) create mode 100644 arch/mips/boot/compressed/uart-prom.c (limited to 'arch/mips') diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 058dfd2084b8..178cf1fbd033 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1766,6 +1766,10 @@ config SYS_SUPPORTS_ZBOOT_UART16550 bool select SYS_SUPPORTS_ZBOOT +config SYS_SUPPORTS_ZBOOT_UART_PROM + bool + select SYS_SUPPORTS_ZBOOT + config CPU_LOONGSON2 bool select CPU_SUPPORTS_32BIT_KERNEL diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile index e66b2c69c29c..4eff1ef02eff 100644 --- a/arch/mips/boot/compressed/Makefile +++ b/arch/mips/boot/compressed/Makefile @@ -35,6 +35,7 @@ vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/string.o ifdef CONFIG_DEBUG_ZBOOT vmlinuzobjs-$(CONFIG_DEBUG_ZBOOT) += $(obj)/dbg.o vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o +vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART_PROM) += $(obj)/uart-prom.o vmlinuzobjs-$(CONFIG_MIPS_ALCHEMY) += $(obj)/uart-alchemy.o endif diff --git a/arch/mips/boot/compressed/uart-prom.c b/arch/mips/boot/compressed/uart-prom.c new file mode 100644 index 000000000000..1c3d51bc90bb --- /dev/null +++ b/arch/mips/boot/compressed/uart-prom.c @@ -0,0 +1,7 @@ + +extern void prom_putchar(unsigned char ch); + +void putc(char c) +{ + prom_putchar(c); +} -- cgit v1.2.3