1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index f5ee7ce16fa6..43e4a49f2cc4 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -71,7 +71,10 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
         void __iomem *image;
         int last_image;
 
-        /* IORESOURCE_ROM_SHADOW only set on x86 */
+        /*
+         * IORESOURCE_ROM_SHADOW set if the VGA enable bit of the Bridge Control
+         * register is set for embedded VGA.
+         */
         if (res->flags & IORESOURCE_ROM_SHADOW) {
                 /* primary video rom always starts here */
                 start = (loff_t)0xC0000;