From 79691961bae9a0eaf261615aeff472b5d186dfc0 Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Tue, 31 Jul 2007 03:32:22 +0100
Subject: Add identifier for the network device into the DHCP request.

---
 src/include/gpxe/dhcp.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/include')

diff --git a/src/include/gpxe/dhcp.h b/src/include/gpxe/dhcp.h
index a7cac228d..863227867 100644
--- a/src/include/gpxe/dhcp.h
+++ b/src/include/gpxe/dhcp.h
@@ -168,6 +168,19 @@ struct job_interface;
  */
 #define DHCP_EB_SIADDR DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 3 )
 
+/** Network device descriptor
+ *
+ * Byte 0 is the bus type ID; remaining bytes depend on the bus type.
+ *
+ * PCI devices:
+ * Byte 0 : 1 (PCI)
+ * Byte 1 : PCI vendor ID MSB
+ * Byte 2 : PCI vendor ID LSB
+ * Byte 3 : PCI device ID MSB
+ * Byte 4 : PCI device ID LSB
+ */
+#define DHCP_EB_BUS_ID DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xb1 )
+
 /** BIOS drive number
  *
  * This is the drive number for a drive emulated via INT 13.  0x80 is
-- 
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