[OpenBIOS] [PATCH v2] arch/ppc/qemu: do not override boot-device if already set

[BALATON Zoltan]

Only set the boot-device env variable if it is not yet set, do not
override values set e.g. by -prom-env option of QEMU.

Signed-off-by: BALATON Zoltan

Index: openbios-devel/arch/ppc/qemu/init.c
===================================================================
--- openbios-devel/arch/ppc/qemu/init.c	(revision 1298)
+++ openbios-devel/arch/ppc/qemu/init.c	(working copy)
@@ -659,7 +689,7 @@
     char buf[64], qemu_uuid[16];
     const char *stdin_path, *stdout_path, *boot_path;
     uint32_t temp = 0;
-
+    char *boot_device;
     ofmem_t *ofmem = ofmem_arch_get_private();

openbios_init();
@@ -867,24 +903,28 @@
     push_str("/options");
     fword("find-device");

-    uint16_t boot_device = fw_cfg_read_i16(FW_CFG_BOOT_DEVICE);
-    switch (boot_device) {
-        case 'c':
-            boot_path = "hd";
-            break;
-        default:
-        case 'd':
-            boot_path = "cd";
-            break;
+    /* Setup default boot devices (not overriding user settings) */
+    fword("boot-device");
+    boot_device = pop_fstr_copy();
+    if (boot_device && strcmp(boot_device, "disk") == 0) {
+        switch (fw_cfg_read_i16(FW_CFG_BOOT_DEVICE)) {
+            case 'c':
+                boot_path = "hd";
+                break;
+            default:
+            case 'd':
+                boot_path = "cd";
+                break;
+        }
+
+        snprintf(buf, sizeof(buf), "%s:,\\:tbxi %s:,\ppc\bootinfo.txt %s:,%%BOOT", boot_path, boot_path, boot_path);
+        push_str(buf);
+        fword("encode-string");
+        push_str("boot-device");
+        fword("property");
     }
+    free(boot_device);

-    /* Setup default boot devices */
-    snprintf(buf, sizeof(buf), "%s:,\\:tbxi %s:,\ppc\bootinfo.txt %s:,%%BOOT", boot_path, boot_path, boot_path);
-    push_str(buf);
-    fword("encode-string");
-    push_str("boot-device");
-    fword("property");
-
     /* Set up other properties */

push_str("/chosen");