[PATCH 2/4] add VGA_EDID staff

[Hiroshi Miura]

Signed-off-by: Hiroshi Miura 
---
 vgasrc/Kconfig |    8 ++++++++
 vgasrc/vbe.c   |    5 +++++
 2 files changed, 13 insertions(+)

diff --git a/vgasrc/Kconfig b/vgasrc/Kconfig
index 6b22c39..42540e0 100644
--- a/vgasrc/Kconfig
+++ b/vgasrc/Kconfig
@@ -54,6 +54,14 @@ menu "VGA ROM"
         help
             Support VBE.

+    config VGA_EDID
+        depends on VGA_VBE
+        bool "VBE DDC EDID support"
+        default y
+        help
+            Support VBE Direct Display Connection(DDC) standard's.
+            Extended Display Information Descriptor(EDID).
+
     config VGA_PCI
         depends on BUILD_VGABIOS
         bool "PCI ROM Headers"
diff --git a/vgasrc/vbe.c b/vgasrc/vbe.c
index ed7c6ee..423cbe1 100644
--- a/vgasrc/vbe.c
+++ b/vgasrc/vbe.c
@@ -392,6 +392,11 @@ vbe_104f15(struct bregs *regs)
     u16 unit = regs->cx;
     u16 block = regs->dx;

+    if (!CONFIG_VGA_EDID) {
+        regs->ax = 0x014f;
+        return;
+    }
+
     switch (regs->bl) {
     case 0x00: /* Report VBE/DDC Capabilities */
         ret = vgahw_get_ddc_capabilities(unit);