Aaron Durbin (adurbin@google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4935
-gerrit
commit b87a6993a62c3ac6643cfb1447f29341a577fa73 Author: Duncan Laurie dlaurie@chromium.org Date: Mon Nov 4 17:02:45 2013 -0800
baytrail: Add function to read top of low memory
The top of low memory is also the start of the region where PCIe resources are allocated. This needs to be passed in ACPI but is only readable from IOSF.
BUG=chrome-os-partner:23505 BRANCH=rambi TEST=build and boot on rambi
Change-Id: Iad95335f72dc3e35b837bedb8d52d388c861a330 Signed-off-by: Duncan Laurie dlaurie@chromium.org Reviewed-on: https://chromium-review.googlesource.com/175625 Reviewed-by: Aaron Durbin adurbin@chromium.org Signed-off-by: Aaron Durbin adurbin@chromium.org --- src/soc/intel/baytrail/baytrail/iomap.h | 5 +++++ src/soc/intel/baytrail/northcluster.c | 8 +++++++- 2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/src/soc/intel/baytrail/baytrail/iomap.h b/src/soc/intel/baytrail/baytrail/iomap.h index 77a55f5..d231dee 100644 --- a/src/soc/intel/baytrail/baytrail/iomap.h +++ b/src/soc/intel/baytrail/baytrail/iomap.h @@ -79,4 +79,9 @@
#define SMBUS_BASE_ADDRESS 0xefa0
+#ifndef __ACPI__ +/* Read Top of Low Memory (BMBOUND) */ +uint32_t nc_read_top_of_low_memory(void); +#endif + #endif /* _BAYTRAIL_IOMAP_H_ */ diff --git a/src/soc/intel/baytrail/northcluster.c b/src/soc/intel/baytrail/northcluster.c index eca122c..e259163 100644 --- a/src/soc/intel/baytrail/northcluster.c +++ b/src/soc/intel/baytrail/northcluster.c @@ -23,6 +23,7 @@ #include <device/pci.h> #include <device/pci_ids.h>
+#include <baytrail/iomap.h> #include <baytrail/iosf.h> #include <baytrail/pci_devs.h> #include <baytrail/ramstage.h> @@ -64,6 +65,11 @@ */ #define RES_IN_KiB(r) ((r) >> 10)
+uint32_t nc_read_top_of_low_memory(void) +{ + return iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1); +} + static void nc_read_resources(device_t dev) { unsigned long mmconf; @@ -107,7 +113,7 @@ static void nc_read_resources(device_t dev) reserved_ram_resource(dev, index++, smmrrl, smmrrh - smmrrl);
/* All address space between bmbound and smmrrh is unusable. */ - bmbound = RES_IN_KiB(iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1)); + bmbound = RES_IN_KiB(nc_read_top_of_low_memory()); mmio_resource(dev, index++, smmrrh, bmbound - smmrrh);
/* The BMBOUND_HI register matches register bits of 31:24 with address