Merge branch 'merge'

[firefly-linux-kernel-4.4.55.git] / arch / powerpc / kernel / udbg.c

diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index 558c1ceb2b93fb046b96971235af929a00247dc2..67d9fd9ae2b53092cc2bf7727f29060f4331f921 100644 (file)
--- a/arch/powerpc/kernel/udbg.c
+++ b/arch/powerpc/kernel/udbg.c
@@ -14,12 +14,38 @@
 #include <linux/types.h>
 #include <linux/sched.h>
 #include <linux/console.h>
+#include <linux/init.h>
 #include <asm/processor.h>
+#include <asm/udbg.h>
 
 void (*udbg_putc)(char c);
 int (*udbg_getc)(void);
 int (*udbg_getc_poll)(void);
 
+/*
+ * Early debugging facilities. You can enable _one_ of these via .config,
+ * if you do so your kernel _will not boot_ on anything else. Be careful.
+ */
+void __init udbg_early_init(void)
+{
+#if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
+       /* For LPAR machines that have an HVC console on vterm 0 */
+       udbg_init_debug_lpar();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
+       /* For use on Apple G5 machines */
+       udbg_init_pmac_realmode();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS)
+       /* RTAS panel debug */
+       udbg_init_rtas();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
+       /* Maple real mode debug */
+       udbg_init_maple_realmode();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES)
+       /* For iSeries - hit Ctrl-x Ctrl-x to see the output */
+       udbg_init_iseries();
+#endif
+}
+
 /* udbg library, used by xmon et al */
 void udbg_puts(const char *s)
 {
@@ -116,12 +142,14 @@ static int early_console_initialized;
 
 void __init disable_early_printk(void)
 {
-#if 1
        if (!early_console_initialized)
                return;
+       if (strstr(saved_command_line, "udbg-immortal")) {
+               printk(KERN_INFO "early console immortal !\n");
+               return;
+       }
        unregister_console(&udbg_console);
        early_console_initialized = 0;
-#endif
 }
 
 /* called by setup_system */