[SeaBIOS] [RFC] paravirt: Only enable sercon in NOGRAPHIC mode if no other console specified

[Kevin O'Connor]

Signed-off-by: Kevin O'Connor <kevin at koconnor.net>
---

I wonder if it would be better to only enable sercon with 0x3f8 in the
nographic case if QEMU has neither specified a sercon-port and has not
requested sgabios to be loaded.  This is just an idea.

-Kevin

---
 src/fw/paravirt.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c
index 9674ab8..0770c47 100644
--- a/src/fw/paravirt.c
+++ b/src/fw/paravirt.c
@@ -513,12 +513,6 @@ qemu_cfg_legacy(void)
     qemu_romfile_add("etc/irq0-override", QEMU_CFG_IRQ0_OVERRIDE, 0, 1);
     qemu_romfile_add("etc/max-cpus", QEMU_CFG_MAX_CPUS, 0, 2);
 
-    // serial console
-    u16 nogfx = 0;
-    qemu_cfg_read_entry(&nogfx, QEMU_CFG_NOGRAPHIC, sizeof(nogfx));
-    if (nogfx)
-        const_romfile_add_int("etc/sercon-port", PORT_SERIAL1);
-
     // NUMA data
     u64 numacount;
     qemu_cfg_read_entry(&numacount, QEMU_CFG_NUMA, sizeof(numacount));
@@ -620,4 +614,11 @@ void qemu_cfg_init(void)
         acpi_pm_base = 0x0600;
         dprintf(1, "Moving pm_base to 0x%x\n", acpi_pm_base);
     }
+
+    // serial console
+    u16 nogfx = 0;
+    qemu_cfg_read_entry(&nogfx, QEMU_CFG_NOGRAPHIC, sizeof(nogfx));
+    if (nogfx && !romfile_find("etc/sercon-port")
+        && !romfile_find("vgaroms/sgabios.bin"))
+        const_romfile_add_int("etc/sercon-port", PORT_SERIAL1);
 }
-- 
2.9.5