mainboard: Add Supermicro X10SLM+-F

This board runs well with coreboot. The documentation part of this
commit lists what works and what doesn't.

Tested with GRUB 2.02 as a payload, loading SeaBIOS 1.12.0 which then
boots FreeBSD 11.2. It has also been tested with GRUB directly booting
Debian GNU/Linux 9.6 (kernel 4.9).

Change-Id: I291573d4651bdffe24eb841033ea6189fcbf8502
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/c/30357
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/mainboard/supermicro/x10slm-f/mainboard.c b/src/mainboard/supermicro/x10slm-f/mainboard.c
new file mode 100644
index 0000000000..8d0e3b0281
--- /dev/null
+++ b/src/mainboard/supermicro/x10slm-f/mainboard.c
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci_def.h>
+#include <option.h>
+#include <stdint.h>
+#include <types.h>
+
+/*
+ * Hiding the AST2400 might be desirable to reduce attack surface.
+ *
+ * The PCIe root port that the AST2400 is on is disabled, but the
+ * AST2400 itself likely remains in an enabled state.
+ *
+ * The AST2400 is also attached to the LPC. That interface does not get
+ * disabled.
+ */
+static void hide_ast2400(void)
+{
+	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1c, 0));
+	if (!dev)
+		return;
+
+	/*
+	 * Marking this device as disabled means that the southbridge code
+	 * will properly disable the root port when it configures it later.
+	 */
+	dev->enabled = 0;
+	printk(BIOS_INFO, "The AST2400 is now set to be hidden.\n");
+}
+
+static void mainboard_enable(struct device *dev)
+{
+	u8 hide = 0;
+
+	if (get_option(&hide, "hide_ast2400") == CB_SUCCESS && hide)
+		hide_ast2400();
+}
+
+struct chip_operations mainboard_ops = {
+	CHIP_NAME("X10SLM+-F")
+	.enable_dev = mainboard_enable,
+};