serial: coreboot: Accept DBG2 subtype 0x12

U-Boot running as a coreboot payload obtains serial console
information either from the coreboot table or from the ACPI DBG2
table.

When serial console support is disabled in coreboot, the coreboot
table does not contain serial information. In this case U-Boot falls
back to parsing the DBG2 table.

Some AMD platforms or any other platforms that uses memory-mapped I/O
advertise the debug UART using DBG2 subtype 0x0012 ("16550-compatible
with parameters defined in Generic Address Structure"). U-Boot
currently accepts only subtype 0x0000, causing DBG2 UART detection to
fail and leaving no console output.

Accept subtype 0x0012 as well and keep the existing handling logic.

Signed-off-by: Desapogu Jayaramudu <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

0 files changed, 0 insertions, 0 deletions