Change in coreboot[master]: soc/baytrail: fix ACPI table by recollecting TOLM

[Matt DeVillier (Code Review)]

Matt DeVillier has uploaded this change for review. ( https://review.coreboot.org/20081

Change subject: soc/baytrail: fix ACPI table by recollecting TOLM
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soc/baytrail: fix ACPI table by recollecting TOLM

Adapted from Chromium commit 8fbe1e7 for soc/braswell
(also review.coreboot.org/#/c/20060/); same issue affects
baytrail as well.

This patch recollects TOLM accessing; as Aaron recalled some
core_msr_script turns off access to TOLM register, he suggests
to store tolm to avoid getting back a zero while setting acpi
nvs space.

Change-Id: Ib26d4fe229b3f7d8ee664f5d89774d1f4a997f51
Signed-off-by: Matt DeVillier 
---
M src/soc/intel/baytrail/northcluster.c
1 file changed, 9 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/81/20081/1

diff --git a/src/soc/intel/baytrail/northcluster.c b/src/soc/intel/baytrail/northcluster.c
index 55ace59..c8ba9c1 100644
--- a/src/soc/intel/baytrail/northcluster.c
+++ b/src/soc/intel/baytrail/northcluster.c
@@ -20,7 +20,7 @@
 #include <device/pci_ids.h>
 #include <vendorcode/google/chromeos/chromeos.h>
 #include <arch/acpi.h>
-
+#include <stddef.h>
 #include <soc/iomap.h>
 #include <soc/iosf.h>
 #include <soc/pci_devs.h>
@@ -65,7 +65,14 @@

uint32_t nc_read_top_of_low_memory(void)
 {
-	return iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1);
+	MAYBE_STATIC uint32_t tolm = 0;
+
+	if (tolm)
+		return tolm;
+
+	tolm = iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1);
+
+	return tolm;
 }

static void nc_read_resources(device_t dev)