parisc: Add opt/console fw_cfg option to select default console

By default the firmware will choose the (virtual) graphics card
as firmware console if the graphics card is available.
If not it defaults to serial console.

In some configurations it's useful to select the serial console
als default output device even if the graphics card is available.
For that, this patch adds the opt/console fw_cfg qemu option.

Qemu option usage to switch the firmare to use the serial or graphics
default output:

-fw_cfg opt/console,string=serial
-fw_cfg opt/console,string=graphics

Signed-off-by: Helge Deller <deller@gmx.de>

1 files changed, 24 insertions, 4 deletions

diff --git a/src/parisc/parisc.c b/src/parisc/parisc.c
index b54e4be..4c1baaa 100644
--- a/src/parisc/parisc.c
+++ b/src/parisc/parisc.c
@@ -112,6 +112,11 @@ extern unsigned long boot_args[];
 #define DEBUG_PDC       0x0001
 #define DEBUG_IODC      0x0002
 
+int pdc_console;
+/* flags for pdc_console */
+#define CONSOLE_SERIAL    0x0001
+#define CONSOLE_GRAPHICS  0x0002
+
 unsigned long PORT_QEMU_CFG_CTL;
 unsigned int tlb_entries = 256;
 unsigned int btlb_entries = 8;
@@ -1895,6 +1900,7 @@ void __VISIBLE start_parisc_firmware(void)
 {
     unsigned int i, cpu_hz;
     unsigned long iplstart, iplend;
+    char *str;
 
     unsigned long interactive = (linux_kernel_entry == 1) ? 1:0;
     char bootdrive = (char)cmdline; // c = hdd, d = CD/DVD
@@ -1935,6 +1941,15 @@ void __VISIBLE start_parisc_firmware(void)
     /* use -fw_cfg opt/pdc_debug,string=255 to enable all firmware debug infos */
     pdc_debug = romfile_loadstring_to_int("opt/pdc_debug", 0);
 
+    pdc_console = 0; /* default */
+    str = romfile_loadfile("opt/console", NULL);
+    if (str) {
+	if (strcmp(str, "serial") == 0)
+		pdc_console = CONSOLE_SERIAL;
+	if (strcmp(str, "graphics") == 0)
+		pdc_console = CONSOLE_GRAPHICS;
+    }
+
     model.sw_id = romfile_loadstring_to_int("opt/hostid", model.sw_id);
     dprintf(0, "fw_cfg: machine hostid %lu\n", model.sw_id);
 
@@ -1969,18 +1984,23 @@ void __VISIBLE start_parisc_firmware(void)
     PAGE0->imm_spa_size = ram_size;
     PAGE0->imm_max_mem = ram_size;
 
-    // Initialize boot paths (disc, display & keyboard)
+    /* initialize graphics (if available) */
     if (artist_present()) {
         sti_rom_init();
         sti_console_init(&sti_proc_rom);
-        ps2port_setup();
-        prepare_boot_path(&(PAGE0->mem_cons), &mem_cons_sti_boot, 0x60);
-        prepare_boot_path(&(PAGE0->mem_kbd),  &mem_kbd_sti_boot, 0xa0);
         PAGE0->proc_sti = (u32)&sti_proc_rom;
+        ps2port_setup();
     } else {
         remove_from_keep_list(LASI_GFX_HPA);
         remove_from_keep_list(LASI_PS2KBD_HPA);
         remove_from_keep_list(LASI_PS2MOU_HPA);
+    }
+
+    // Initialize boot paths (graphics & keyboard)
+    if (artist_present() && (pdc_console != CONSOLE_SERIAL)) {
+        prepare_boot_path(&(PAGE0->mem_cons), &mem_cons_sti_boot, 0x60);
+        prepare_boot_path(&(PAGE0->mem_kbd),  &mem_kbd_sti_boot, 0xa0);
+    } else {
         prepare_boot_path(&(PAGE0->mem_cons), &mem_cons_boot, 0x60);
         prepare_boot_path(&(PAGE0->mem_kbd),  &mem_kbd_boot, 0xa0);
     }