[PATCH] video: fix no display when serial console is disabled

[Desapogu, Jayaramudu]

AMD General

Hi ,

Gentle ping for this patch.

Could someone please take a look when time permits?

Thanks,
Jayaram

-----Original Message-----
From: Desapogu, Jayaramudu <Jayaramudu.Desapogu at amd.com>
Sent: Wednesday, June 3, 2026 7:00 PM
To: sjg at chromium.org
Cc: u-boot at lists.denx.de; Desapogu, Jayaramudu <Jayaramudu.Desapogu at amd.com>
Subject: [PATCH] video: fix no display when serial console is disabled

When the serial console is disabled in coreboot configuration, no display output is observed during boot.

This happens because DBG2 (Debug Port 2 table) configuration is required for proper UART initialization and affects the video initialization path.

Fix this by ensuring DBG2 is correctly configured as a 16550-compatible UART, allowing video initialization to proceed independently of serial console settings.

Signed-off-by: Desapogu Jayaramudu <jayaramudu.desapogu at amd.com>
---
 include/acpi/acpi_table.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/acpi/acpi_table.h b/include/acpi/acpi_table.h index 4895366a618..3517698ff3e 100644
--- a/include/acpi/acpi_table.h
+++ b/include/acpi/acpi_table.h
@@ -667,7 +667,7 @@ struct __packed acpi_dmar {

 /* Subtypes for port_subtype field */

-#define ACPI_DBG2_16550_COMPATIBLE     0x0000
+#define ACPI_DBG2_16550_COMPATIBLE     0x0012
 #define ACPI_DBG2_16550_SUBSET         0x0001
 #define ACPI_DBG2_ARM_PL011            0x0003
 #define ACPI_DBG2_ARM_SBSA_32BIT       0x000D
--
2.25.1