mb/asus/p2b: Add option table support

Just do it already.

The two SCSI-specific options for p2b-{ls,ds} will be wired up in a
followup. They will be ignored by boards without the hardware.

Change-Id: Ia43d502219d7c23d21f49d651113e3d653c6e9f4
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41560
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/mainboard/asus/p2b/Kconfig

@@ -16,6 +16,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select SUPERIO_WINBOND_W83977TF
 	select HAVE_PIRQ_TABLE
 	select BOARD_ROMSIZE_KB_256
+	select HAVE_OPTION_TABLE
 	select SDRAMPWR_4DIMM if BOARD_ASUS_P2B_LS || BOARD_ASUS_P3B_F
 	select HAVE_ACPI_TABLES if BOARD_ASUS_P2B || BOARD_ASUS_P2B_LS
 	select BASE_ASUS_P2B_D if BOARD_ASUS_P2B_D || BOARD_ASUS_P2B_DS

src/mainboard/asus/p2b/cmos.default

@@ -0,0 +1,8 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+boot_option=Fallback
+debug_level=Debug
+nmi=Enable
+udma_enable=Enable
+scsi_lvd_term=Enable
+scsi_se_term=Enable

src/mainboard/asus/p2b/cmos.layout

@@ -0,0 +1,72 @@
+entries
+
+# -----------------------------------------------------------------
+0            120     r       0         reserved_memory
+#120          264     r       0        unused
+
+# -----------------------------------------------------------------
+# RTC_BOOT_BYTE (coreboot hardcoded)
+384          1       e       3         boot_option
+388          4       h       0         reboot_counter
+
+# -----------------------------------------------------------------
+# coreboot config options: console
+395          4       e       4        debug_level
+
+# -----------------------------------------------------------------
+# coreboot config options: southbridge
+
+# Non Maskable Interrupt(NMI) support, which is an interrupt that may
+# occur on a RAM or unrecoverable error.
+408          1       e       1        nmi
+
+#409	2       e       5        power_on_after_fail
+411	1       e       1        udma_enable
+
+# -----------------------------------------------------------------
+# p2b-[ld]s config options: onboard SCSI termination
+# Controls PIIX4 GPO22 (Ultra2-68) and GPO23 (SCSI-50)
+412	1	e	1	scsi_se_term
+413	1	e	2	scsi_lvd_term
+
+# -----------------------------------------------------------------
+# TODO: raminit config options
+#415	1	e	6	ram_timing
+#416	1	e	5	srp_timing
+#417	1	e	5	srcd_timing
+#418	1	e	5	cas_latency
+
+enumerations
+#ID value   text
+
+# Generic on/off enum
+1     0     Disable
+1     1     Enable
+# Inverted on/off enum
+2     0     Enable
+2     1     Disable
+
+# boot_option
+3     0     Fallback
+3     1     Normal
+
+# debug_level
+4     0     Emergency
+4     1     Alert
+4     2     Critical
+4     3     Error
+4     4     Warning
+4     5     Notice
+4     6     Info
+4     7     Debug
+4     8     Spew
+
+#5	0	3
+#5	1	2
+
+#6	0	Auto
+#6	1	Manual
+
+checksums
+
+checksum 592 975 976