[OpenBIOS] [PATCH 2/2] SPARC32: use serial console when QEMU is launched with -vga none

[Mark Cave-Ayland]

If no display device has been installed in the DT e.g. passing -vga none into
the QEMU command line then fall back to using the serial console as already
occurs when launching QEMU in -nographic mode.

Signed-off-by: Mark Cave-Ayland 
---
 arch/sparc32/openbios.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/sparc32/openbios.c b/arch/sparc32/openbios.c
index 78005e0..9ec28bf 100644
--- a/arch/sparc32/openbios.c
+++ b/arch/sparc32/openbios.c
@@ -758,8 +758,16 @@ static void setup_stdio(void)
 {
     char nographic;
     const char *stdin, *stdout;
+    phandle_t display_ph;

fw_cfg_read(FW_CFG_NOGRAPHIC, &nographic, 1);
+
+    /* Check to see if any framebuffer present */
+    display_ph = dt_iterate_type(0, "display");
+    if (display_ph == 0) {
+        nographic = 1;
+    }
+
     if (nographic) {
         obp_stdin = PROMDEV_TTYA;
         obp_stdout = PROMDEV_TTYA;