Revert "mb/aopen/dxplplusu: Remove board"

This reverts commit eb76a455cd39ec59b7f2ba28baeec9538befd59e
and applies minor fixes to make it build again.

PARALLEL_MP was working prior to board removal and no
relevant SMI handlers were implemented. So NO_SMM choice
is now selected.

Change-Id: Ia1cd02278240d1b5d006fb2a7730d3d86390f85b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69339
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/northbridge/intel/e7505/memmap.c b/src/northbridge/intel/e7505/memmap.c
new file mode 100644
index 0000000..b1ac3d1
--- /dev/null
+++ b/src/northbridge/intel/e7505/memmap.c
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+// Use simple device model for this file even in ramstage
+#define __SIMPLE_DEVICE__
+
+#include <device/pci_ops.h>
+#include <arch/romstage.h>
+#include <cbmem.h>
+#include <cpu/x86/mtrr.h>
+#include <program_loading.h>
+#include "e7505.h"
+
+void *cbmem_top_chipset(void)
+{
+	const pci_devfn_t mch = PCI_DEV(0, 0, 0);
+	uintptr_t tolm;
+
+	/* This is at 128 MiB boundary. */
+	tolm = pci_read_config16(mch, TOLM) >> 11;
+	tolm <<= 27;
+
+	return (void *)tolm;
+}
+
+void northbridge_write_smram(u8 smram);
+
+void northbridge_write_smram(u8 smram)
+{
+	const pci_devfn_t mch = PCI_DEV(0, 0, 0);
+	pci_write_config8(mch, SMRAMC, smram);
+}
+
+void fill_postcar_frame(struct postcar_frame *pcf)
+{
+	uintptr_t top_of_ram;
+
+	/*
+	 * Choose to NOT set ROM as WP cacheable here.
+	 * Timestamps indicate the CPU this northbridge code is
+	 * connected to, performs better for memcpy() and un-lzma
+	 * operations when source is left as UC.
+	 */
+
+	pcf->skip_common_mtrr = 1;
+
+	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
+	postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
+
+	/* Cache CBMEM region as WB. */
+	top_of_ram = (uintptr_t)cbmem_top();
+	postcar_frame_add_mtrr(pcf, top_of_ram - 8*MiB, 8*MiB,
+		MTRR_TYPE_WRBACK);
+}