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MIPS: zboot: Add support for serial debug using the PROM

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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 <albeu@free.fr>
Cc: Alex Smith <alex.smith@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
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 <ralf@linux-mips.org>
This commit is contained in:
Alban Bedel 2015-12-10 10:57:21 +01:00 committed by Ralf Baechle
parent 25f66096ac
commit dbb9831453
3 changed files with 12 additions and 0 deletions
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4
arch/mips/Kconfig
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@ -1766,6 +1766,10 @@ config SYS_SUPPORTS_ZBOOT_UART16550
bool bool
select SYS_SUPPORTS_ZBOOT select SYS_SUPPORTS_ZBOOT
config SYS_SUPPORTS_ZBOOT_UART_PROM
bool
select SYS_SUPPORTS_ZBOOT
config CPU_LOONGSON2 config CPU_LOONGSON2
bool bool
select CPU_SUPPORTS_32BIT_KERNEL select CPU_SUPPORTS_32BIT_KERNEL

1
arch/mips/boot/compressed/Makefile
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@ -35,6 +35,7 @@ vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/string.o
ifdef CONFIG_DEBUG_ZBOOT ifdef CONFIG_DEBUG_ZBOOT
vmlinuzobjs-$(CONFIG_DEBUG_ZBOOT) += $(obj)/dbg.o vmlinuzobjs-$(CONFIG_DEBUG_ZBOOT) += $(obj)/dbg.o
vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o
vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART_PROM) += $(obj)/uart-prom.o
vmlinuzobjs-$(CONFIG_MIPS_ALCHEMY) += $(obj)/uart-alchemy.o vmlinuzobjs-$(CONFIG_MIPS_ALCHEMY) += $(obj)/uart-alchemy.o
endif endif

7
arch/mips/boot/compressed/uart-prom.c Normal file
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@ -0,0 +1,7 @@
extern void prom_putchar(unsigned char ch);
void putc(char c)
{
prom_putchar(c);
}