Change in flashrom[master]: vt_vx: check whether the chipset's MMIO range is configured

[Nico Huber (Code Review)]

Nico Huber has submitted this change and it was merged. ( https://review.coreboot.org/23029 )

Change subject: vt_vx: check whether the chipset's MMIO range is configured
......................................................................

vt_vx: check whether the chipset's MMIO range is configured

Avoid attempting to read the SPI bases from the location 0x00000000, all
zeroes mean that the chipset's MMIO area is not enabled.

Change-Id: I5d3a1ba695153e854e0979ae634f8ed97e6b6293
Signed-off-by: Lubomir Rintel 
Reviewed-on: https://review.coreboot.org/23029
Tested-by: build bot (Jenkins) 
Reviewed-by: Nico Huber 
Reviewed-by: David Hendricks 
---
M chipset_enable.c
1 file changed, 8 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Nico Huber: Looks good to me, approved
  David Hendricks: Looks good to me, approved

diff --git a/chipset_enable.c b/chipset_enable.c
index a499ba0..5716ebf 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -1013,10 +1013,18 @@
    switch(dev->device_id) {
    	case 0x8353: /* VX800/VX820 */
    		spi0_mm_base = pci_read_long(dev, 0xbc) << 8;
+			if (spi0_mm_base == 0x0) {
+				msg_pdbg ("MMIO not enabled!\n");
+				return ERROR_FATAL;
+			}
    		break;
    	case 0x8409: /* VX855/VX875 */
    	case 0x8410: /* VX900 */
    		mmio_base = pci_read_long(dev, 0xbc) << 8;
+			if (mmio_base == 0x0) {
+				msg_pdbg ("MMIO not enabled!\n");
+				return ERROR_FATAL;
+			}
    		mmio_base_physmapped = physmap("VIA VX MMIO register", mmio_base, SPI_CNTL_LEN);
    		if (mmio_base_physmapped == ERROR_PTR)
    			return ERROR_FATAL;