(mmio) or 32-bit (mmio32).
The options are the same as for ttyS, above.
- earlyprintk= [X86,SH,BLACKFIN,ARM]
+ earlyprintk= [X86,SH,BLACKFIN,ARM,M68k]
earlyprintk=vga
earlyprintk=efi
earlyprintk=xen
config EARLY_PRINTK
bool "Early printk"
- depends on MVME16x || MAC
+ depends on !(SUN3 || M68360 || M68000 || COLDFIRE)
help
Write kernel log output directly to a serial port.
+ Where implemented, output goes to the framebuffer as well.
+ PROM console functionality on Sun 3x is not affected by this option.
+
+ Pass "earlyprintk" on the kernel command line to get a
+ boot console.
This is useful for kernel debugging when your machine crashes very
- early before the console code is initialized.
+ early, i.e. before the normal console driver is loaded.
You should normally say N here, unless you want to debug such a crash.
if !MMU
obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
obj-$(CONFIG_BOOTINFO_PROC) += bootinfo_proc.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+
--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2014 Finn Thain
+ */
+
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <asm/setup.h>
+
+asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
+
+static void debug_cons_write(struct console *c,
+ const char *s, unsigned n)
+{
+ debug_cons_nputs(s, n);
+}
+
+static struct console early_console_instance = {
+ .name = "debug",
+ .write = debug_cons_write,
+ .flags = CON_PRINTBUFFER | CON_BOOT,
+ .index = -1
+};
+
+static int __init setup_early_printk(char *buf)
+{
+ /* MVME16x registers an early console after interrupt setup. */
+ if (MACH_IS_MVME16x)
+ return 0;
+
+ if (early_console || buf)
+ return 0;
+
+ early_console = &early_console_instance;
+ register_console(early_console);
+
+ return 0;
+}
+early_param("earlyprintk", setup_early_printk);
+
+/*
+ * debug_cons_nputs() defined in arch/m68k/kernel/head.S cannot be called
+ * after init sections are discarded (for platforms that use it).
+ */
+#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68360) || \
+ defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE))
+
+static int __init unregister_early_console(void)
+{
+ if (!early_console)
+ return 0;
+
+ return unregister_console(early_console);
+}
+late_initcall(unregister_early_console);
+
+#endif
* MMU_PRINT: There is a routine built into head.S that can display the
* MMU data structures. It outputs its result through the serial_putc
* interface. So where ever that winds up driving data, that's where the
- * mmu struct will appear. On the Macintosh that's typically the console.
+ * mmu struct will appear.
*
* SERIAL_DEBUG: There are a series of putc() macro statements
* scattered through out the code to give progress of status to the
* USE_MFP: Use the ST-MFP port (Modem1) for serial debug.
*
* Macintosh constants:
- * MAC_USE_SCC_A: Use SCC port A (modem) for serial debug and early console.
- * MAC_USE_SCC_B: Use SCC port B (printer) for serial debug and early console.
+ * MAC_USE_SCC_A: Use SCC port A (modem) for serial debug.
+ * MAC_USE_SCC_B: Use SCC port B (printer) for serial debug.
*/
#include <linux/linkage.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
-
#ifdef CONFIG_MAC
-
-#include <asm/machw.h>
-
-#ifdef CONFIG_FRAMEBUFFER_CONSOLE
-#define CONSOLE_DEBUG
+# include <asm/machw.h>
#endif
#ifdef CONFIG_EARLY_PRINTK
-#define SERIAL_DEBUG
-#else
-#undef SERIAL_DEBUG
+# define SERIAL_DEBUG
+# if defined(CONFIG_MAC) && defined(CONFIG_FONT_SUPPORT)
+# define CONSOLE_DEBUG
+# endif
#endif
-#else /* !CONFIG_MAC */
-
-#define SERIAL_DEBUG
-
-#endif /* !CONFIG_MAC */
-
#undef MMU_PRINT
#undef MMU_NOCACHE_KERNEL
#undef DEBUG
func_return putn
-#ifdef CONFIG_MAC
+#ifdef CONFIG_EARLY_PRINTK
/*
- * mac_early_print
- *
* This routine takes its parameters on the stack. It then
* turns around and calls the internal routines. This routine
* is used by the boot console.
*
* The calling parameters are:
- * void mac_early_print(const char *str, unsigned length);
+ * void debug_cons_nputs(const char *str, unsigned length)
*
* This routine does NOT understand variable arguments only
* simple strings!
*/
-ENTRY(mac_early_print)
+ENTRY(debug_cons_nputs)
moveml %d0/%d1/%a0,%sp@-
movew %sr,%sp@-
ori #0x0700,%sr
movew %sp@+,%sr
moveml %sp@+,%d0/%d1/%a0
rts
-#endif /* CONFIG_MAC */
+#endif /* CONFIG_EARLY_PRINTK */
#if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
func_start set_leds,%d0/%a0
static void mac_identify(void);
static void mac_report_hardware(void);
-#ifdef CONFIG_EARLY_PRINTK
-asmlinkage void __init mac_early_print(const char *s, unsigned n);
-
-static void __init mac_early_cons_write(struct console *con,
- const char *s, unsigned n)
-{
- mac_early_print(s, n);
-}
-
-static struct console __initdata mac_early_cons = {
- .name = "early",
- .write = mac_early_cons_write,
- .flags = CON_PRINTBUFFER | CON_BOOT,
- .index = -1
-};
-
-int __init mac_unregister_early_cons(void)
-{
- /* mac_early_print can't be used after init sections are discarded */
- return unregister_console(&mac_early_cons);
-}
-
-late_initcall(mac_unregister_early_cons);
-#endif
-
static void __init mac_sched_init(irq_handler_t vector)
{
via_init_clock(vector);
mach_beep = mac_mksound;
#endif
-#ifdef CONFIG_EARLY_PRINTK
- register_console(&mac_early_cons);
-#endif
-
/*
* Determine hardware present
*/
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