arm: add device tree support

If compiled with CONFIG_FDT, allow user to specify a device tree file using
the -dtb argument.  If the machine supports it then the dtb will be loaded
into memory and passed to the kernel on boot.

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
[Peter Maydell: Use machine opt rather than global to pass dtb filename]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/vl.c b/vl.c
index 4a77696374..97ab2b9c1a 100644
--- a/vl.c
+++ b/vl.c
@@ -2527,6 +2527,9 @@ int main(int argc, char **argv, char **envp)
             case QEMU_OPTION_append:
                 qemu_opts_set(qemu_find_opts("machine"), 0, "append", optarg);
                 break;
+            case QEMU_OPTION_dtb:
+                qemu_opts_set(qemu_find_opts("machine"), 0, "dtb", optarg);
+                break;
             case QEMU_OPTION_cdrom:
                 drive_add(IF_DEFAULT, 2, optarg, CDROM_OPTS);
                 break;
@@ -3346,6 +3349,11 @@ int main(int argc, char **argv, char **envp)
         exit(1);
     }
 
+    if (!linux_boot && machine_opts && qemu_opt_get(machine_opts, "dtb")) {
+        fprintf(stderr, "-dtb only allowed with -kernel option\n");
+        exit(1);
+    }
+
     os_set_line_buffering();
 
     if (init_timer_alarm() < 0) {