ARM: Separate the early console (romstage) from the bootblock console.

It might be that you want an early console in romstage before RAM is up, but
you can't or don't want to support the console all the way back in the
bootblock. By making the console in those two different environments
configurable seperately that becomes possible.

On the 5250 console output as early as the bootblock works, but on the 5420 it
only starts working in the ROM stage after clocks have been initialized.

BUG=chrome-os-partner:19420
TEST=Built and booted on pit with another change and an external tool, and was
able to get serial output. Built for snow.
BRANCH=None

Change-Id: Ie27ae7a7b22f336d23893618969efde4145fefd7
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/57725
Reviewed-by: Stefan Reinauer <reinauer@google.com>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>

src/arch/armv7/Makefile.inc

@@ -163,7 +163,7 @@ $(obj)/mainboard/$(MAINBOARDDIR)/romstage.pre.inc: $(src)/mainboard/$(MAINBOARDD
 ramstage-y += exception.c
 ramstage-y += exception_asm.S
 
-bootblock-$(CONFIG_EARLY_CONSOLE) += early_console.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += early_console.c
 bootblock-y += cache.c
 
 romstage-y += cache.c

src/arch/armv7/bootblock_simple.c

@@ -68,7 +68,7 @@ void main(void)
 		bootblock_mainboard_init();
 	}
 
-#ifdef CONFIG_EARLY_CONSOLE
+#ifdef CONFIG_BOOTBLOCK_CONSOLE
 	console_init();
 #endif
 

src/console/Kconfig

@@ -1,5 +1,15 @@
 menu "Console"
 
+config DEFAULT_BOOTBLOCK_CONSOLE
+	bool
+	default n
+
+config BOOTBLOCK_CONSOLE
+	bool "Enable early (bootblock) console output."
+	default DEFAULT_BOOTBLOCK_CONSOLE
+	help
+	  Use console during the bootblock if supported
+
 config DEFAULT_EARLY_CONSOLE
 	bool
 	default n

src/console/Makefile.inc

@@ -14,7 +14,7 @@ romstage-y += console.c
 romstage-y += post.c
 romstage-y += die.c
 
-bootblock-$(CONFIG_EARLY_CONSOLE) += vtxprintf.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += vtxprintf.c
 bootblock-y += console.c
 bootblock-y += die.c
 

src/console/console.c

@@ -101,7 +101,8 @@ int console_tst_byte(void)
 
 void console_init(void)
 {
-#if CONFIG_EARLY_CONSOLE
+#if defined(__BOOT_BLOCK__) && CONFIG_BOOTBLOCK_CONSOLE || \
+    !defined(__BOOT_BLOCK__) && CONFIG_EARLY_CONSOLE
 
 #if CONFIG_USBDEBUG
 	enable_usbdebug(CONFIG_USBDEBUG_DEFAULT_PORT);

src/cpu/samsung/Kconfig

@@ -2,6 +2,7 @@ config CPU_SAMSUNG_EXYNOS5250
 	depends on ARCH_ARMV7
 	select HAVE_MONOTONIC_TIMER
 	select HAVE_UART_SPECIAL
+	select DEFAULT_BOOTBLOCK_CONSOLE
 	select DEFAULT_EARLY_CONSOLE
 	bool
 	default n

src/cpu/samsung/exynos5250/Makefile.inc

@@ -6,14 +6,14 @@ INTERMEDIATE += exynos5250_add_bl1
 bootblock-y += spi.c
 bootblock-y += pinmux.c mct.c power.c
 # Clock is required for UART
-bootblock-$(CONFIG_EARLY_CONSOLE) += clock_init.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += clock.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += monotonic_timer.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += uart.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += clock_init.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += clock.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += monotonic_timer.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += uart.c
 bootblock-y += wakeup.c
 bootblock-y += gpio.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += pwm.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += timer.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += pwm.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += timer.c
 
 romstage-y += spi.c
 romstage-y += clock.c

src/cpu/samsung/exynos5420/Makefile.inc

@@ -6,14 +6,14 @@ INTERMEDIATE += exynos5420_add_bl1
 bootblock-y += spi.c
 bootblock-y += pinmux.c mct.c power.c
 # Clock is required for UART
-bootblock-$(CONFIG_EARLY_CONSOLE) += clock_init.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += clock.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += monotonic_timer.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += uart.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += clock_init.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += clock.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += monotonic_timer.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += uart.c
 bootblock-y += wakeup.c
 bootblock-y += gpio.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += pwm.c
-bootblock-$(CONFIG_EARLY_CONSOLE) += timer.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += pwm.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += timer.c
 
 romstage-y += spi.c
 romstage-y += clock.c

src/include/console/console.h

@@ -84,7 +84,8 @@ void mainboard_post(u8 value);
 void __attribute__ ((noreturn)) die(const char *msg);
 int do_printk(int msg_level, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
 
-#if defined(__PRE_RAM__) && !CONFIG_EARLY_CONSOLE
+#if defined(__BOOT_BLOCK__) && !CONFIG_BOOTBLOCK_CONSOLE || \
+    (defined(__PRE_RAM__) && !defined(__BOOT_BLOCK__)) && !CONFIG_EARLY_CONSOLE
 
 static inline void printk(int LEVEL, const char *fmt, ...);
 static inline void printk(int LEVEL, const char *fmt, ...) {

src/mainboard/emulation/qemu-armv7/Makefile.inc

@@ -22,6 +22,6 @@ bootblock-y += timer.c
 romstage-y += timer.c
 ramstage-y += timer.c
 
-bootblock-$(CONFIG_EARLY_CONSOLE) += uart.c
+bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += uart.c
 romstage-$(CONFIG_EARLY_CONSOLE) += uart.c
 ramstage-y += uart.c