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

[Tom Rini]

On Wed, Jul 08, 2026 at 07:55:54AM +0000, Desapogu, Jayaramudu wrote:
> 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

As presumably these values are defined by some specification, a link to
the source would make it easy to verify this is correct (and in turn, be
a good chance to verify the other values). Thanks.

-- 
Tom
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