[SeaBIOS] [patch] sdcard: skip detection of PCI sdhci controllers if etc/sdcard used

[Matt DeVillier]

Some BayTrail ChromeOS devices have the eMMC controller hidden (thus 
requiring the use of etc/sdcard), while others do not, making it 
problematic to have a single payload which serves all devices properly.  
Therefore, if the CBFS contains etc/sdcard entries, skip detection of 
any visible PCI sdhci controllers in order to avoid duplicate entries in 
the boot menu.

patch implementation suggested by Kevin O'Connor :)

Signed-off-by: Matt DeVillier 
---
  src/hw/sdcard.c | 15 +++++++++------
  1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/hw/sdcard.c b/src/hw/sdcard.c
index 7e0875f..32cdb14 100644
--- a/src/hw/sdcard.c
+++ b/src/hw/sdcard.c
@@ -557,11 +557,14 @@ sdcard_setup(void)
          run_thread(sdcard_romfile_setup, file);
      }

-    struct pci_device *pci;
-    foreachpci(pci) {
-        if (pci->class != PCI_CLASS_SYSTEM_SDHCI || pci->prog_if >= 2)
-            // Not an SDHCI controller following SDHCI spec
-            continue;
-        run_thread(sdcard_pci_setup, pci);
+    //only scan for PCI controllers if etc/sdcard* not used
+    if (file == NULL) {
+        struct pci_device *pci;
+        foreachpci(pci) {
+            if (pci->class != PCI_CLASS_SYSTEM_SDHCI || pci->prog_if >= 2)
+                // Not an SDHCI controller following SDHCI spec
+                continue;
+            run_thread(sdcard_pci_setup, pci);
+        }
      }
  }