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CONFIG_EFI_PCDP: Console device selection via EFI PCDP or HCDP table

General informations

The Linux kernel configuration item CONFIG_EFI_PCDP:

Help text

If your firmware supplies the PCDP table, and you want to automatically use the primary console device it describes as the Linux console, say Y here.

If your firmware supplies the HCDP table, and you want to use the first serial port it describes as the Linux console, say Y here. If your EFI ConOut path contains only a UART device, it will become the console automatically. Otherwise, you must specify the "console=hcdp" kernel boot argument.

Neither the PCDP nor the HCDP affects naming of serial devices, so a serial console may be /dev/ttyS0, /dev/ttyS1, etc, depending on how the driver discovers devices.

You must also enable the appropriate drivers (serial, VGA, etc.)

See DIG64_HCDPv20_042804.pdf available from http://www.dig64.org/specifications/

Hardware

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