qemu-q35: die if started on wrong machine
The QEMU machine "PC" doesn't support MCFG.
Die after console init if the user selected the wrong qemu machine
and print a message to use the correct machine type.
Without this patch ramstage dies with non-helpful message:
"get_pbus: dev is NULL!"
Change-Id: I9d1b24176de971c5f827091bc5bc1bac8426f3f6
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31425
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/mainboard/emulation/qemu-q35/bootblock.c b/src/mainboard/emulation/qemu-q35/bootblock.c
index 13550f7..d5ca7f9 100644
--- a/src/mainboard/emulation/qemu-q35/bootblock.c
+++ b/src/mainboard/emulation/qemu-q35/bootblock.c
@@ -14,6 +14,7 @@
#include <device/pci_ops.h>
#include <bootblock_common.h>
#include <southbridge/intel/i82801ix/i82801ix.h>
+#include <console/console.h>
/* Just define these here, there is no gm35.h file to include. */
#define D0F0_PCIEXBAR_LO 0x60
@@ -39,6 +40,12 @@
pci_io_write_config32(PCI_DEV(0,0,0), D0F0_PCIEXBAR_HI, reg);
reg = CONFIG_MMCONF_BASE_ADDRESS | 1; /* 256MiB - 0-255 buses. */
pci_io_write_config32(PCI_DEV(0,0,0), D0F0_PCIEXBAR_LO, reg);
+
+ /* MCFG is now active. If it's not qemu was started for machine PC */
+ if (CONFIG(BOOTBLOCK_CONSOLE) &&
+ (pci_read_config32(PCI_DEV(0, 0, 0), D0F0_PCIEXBAR_LO) !=
+ (CONFIG_MMCONF_BASE_ADDRESS | 1)))
+ die("You must run qemu for machine Q35 (-M q35)");
}
static void enable_spi_prefetch(void)