From: Anton Blanchard <anton@samba.org>
Lets make a decent attempt to find out where your console is. The new
preferred_console stuff is pretty nice.
---
arch/ppc64/kernel/setup.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+)
diff -puN arch/ppc64/kernel/setup.c~ppc64-use-preferred-console arch/ppc64/kernel/setup.c
--- 25/arch/ppc64/kernel/setup.c~ppc64-use-preferred-console 2004-01-22 19:09:04.000000000 -0800
+++ 25-akpm/arch/ppc64/kernel/setup.c 2004-01-22 19:09:04.000000000 -0800
@@ -430,6 +430,56 @@ void parse_cmd_line(unsigned long r3, un
}
}
+static int __init set_preferred_console(void)
+{
+ struct device_node *prom_stdout;
+ char *name;
+
+ /* The user has requested a console so this is already set up. */
+ if (strstr(cmd_line, "console="))
+ return -EBUSY;
+
+ prom_stdout = find_path_device(of_stdout_device);
+ if (!prom_stdout)
+ return -ENODEV;
+
+ name = (char *)get_property(prom_stdout, "name", NULL);
+ if (!name)
+ return -ENODEV;
+
+ if (strcmp(name, "serial") == 0) {
+ int i;
+ u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
+ if (i > 8) {
+ int offset;
+ switch (reg[1]) {
+ case 0x3f8:
+ offset = 0;
+ break;
+ case 0x2f8:
+ offset = 1;
+ break;
+ case 0x898:
+ offset = 2;
+ break;
+ case 0x890:
+ offset = 3;
+ break;
+ default:
+ /* We dont recognise the serial port */
+ return -ENODEV;
+ }
+
+ return add_preferred_console("ttyS", offset, NULL);
+ }
+ } else if (strcmp(name, "vty") == 0) {
+ /* pSeries LPAR virtual console */
+ return add_preferred_console("hvc", 0, NULL);
+ }
+
+ return -ENODEV;
+}
+console_initcall(set_preferred_console);
#ifdef CONFIG_PPC_PSERIES
int parse_bootinfo(void)
_